01The verdict: is Houston water safe?
Houston's drinking water has significant quality concerns based on EPA testing data. With a grade of F (27.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 719 water systems serve approximately 5,913,076 residents using surface water (rivers, lakes, or reservoirs).
The concern
Copper is over its legal limit
Measured at 1.52 mg/L against the EPA Action Level of 1.3 mg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓ The good news
Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓ Keep watching
lithium is approaching its limit
Measured at 162.0000 µg/L — 120% of the 0.004 µg/L limit. Within the rules, but with less headroom than you'd want.
See the ledger ↓Houston's drinking water received a grade of F (27.8 out of 100), indicating failing water quality. The city's 719 water systems serve approximately 5,913,076 residents using surface water.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. UCMR 5 testing detected 10 PFAS compounds, with levels exceeding EPA maximum contaminant levels in the water supply. The system has 11018 violations on record, including 929 health-based violations. 3572 remain unresolved.
Houston ranks #1065 out of 1067 cities in Texas for water quality, placing it among the lowest-rated in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection. Of particular concern: PFAS "forever chemical" levels exceed the 2024 EPA maximum contaminant levels. These synthetic compounds don't break down naturally and require specialized filtration such as reverse osmosis or granular activated carbon. Hexavalent chromium (chromium-6) was detected at 6.66 µg/L in UCMR 3 testing. While below California's 10 µg/L limit and with no federal MCL set, residents sensitive to this contaminant may consider reverse osmosis filtration. As a major metropolitan system serving over 5.9M residents, Houston faces large-scale infrastructure challenges including aging pipes and the complexity of treating water across a vast distribution network. The system has seen 2071 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
How the 27.8/100 breaks down Methodology →
ViolationsHistorical violation record including health-based and monitoring violations.
0 / 45F
Lead & CopperLead at 0.0 ppb (90th percentile).
16 / 20B
Contaminants10 PFAS compounds detected.
2.8 / 20F
ComplianceMonitoring and reporting compliance with EPA regulations.
5 / 10D
Source RiskWater source: Surface water.
4 / 5B
02What's in Houston's water
Every contaminant flagged in Houston, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
14 detections · sorted by % of legal limit
Over the limit Elevated — watch Within limits
0 50% LEGAL LIMIT 150%
lithium PFAS / Forever Chemical
162.0000 µg/L 120% of limit
1,4-Dioxane Organic
1.15 µg/L 120% of limit
Manganese Inorganic
158.9 µg/L 120% of limit
NDMA (N-Nitrosodimethylamine) Disinfection Byproduct
43.3 ng/L 120% of limit
Chlorate Disinfection Byproduct
13600.0 µg/L 120% of limit
Lithium Inorganic
162.0 µg/L 120% of limit
Vanadium Inorganic
16.00 µg/L 76% of limit
Strontium Inorganic
948.0 µg/L 63% of limit
Cobalt Inorganic
2.78 µg/L 50% of limit
Molybdenum Inorganic
12.60 µg/L 32% of limit
43 contaminants tested under EPA SDWIS, LCR and UCMR programs
· 23 detected
· 1 PFAS over EPA MCL · PFAS hazard index 3.42 (above the 1.0 threshold) Contaminants without a federal MCL are shown against the strictest state or advisory level named in each row.
All Tested Contaminants
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.52 | 1.3 | mg/L | Inorganic | Over Limit |
| 11Cl-PF3OUdS | ND | HI | µg/L | PFAS | Not Detected |
| 4:2 FTS | ND | HI | µg/L | PFAS | Not Detected |
| 6:2 FTS 6:2 FTSPFAS A fluorotelomer sulfonate commonly found at sites contaminated with aqueous film-forming foam (AFFF) used in firefighting. Health EffectsPotential liver toxicity and endocrine disruption. Less studied but identified as a contaminant of concern. EPA LimitNo individual MCL (not yet regulated) Common SourcesFirefighting foam (AFFF), airports, military bases, and industrial facilities. | 0.104 | HI | µg/L | PFAS | Detected |
| 8:2 FTS | ND | HI | µg/L | PFAS | Not Detected |
| 9Cl-PF3ONS | ND | HI | µg/L | PFAS | Not Detected |
| ADONA | ND | HI | µg/L | PFAS | Not Detected |
| HFPO-DA HFPO-DA (GenX)PFAS A replacement for PFOA in manufacturing, marketed as safer but still a persistent "forever chemical." Also known as GenX. Health EffectsLiver and kidney effects, reproductive toxicity, immune system effects, and potential cancer risk. EPA Limit10 ppt MCL Common SourcesFluoropolymer manufacturing (used as PFOA replacement), industrial wastewater discharge. | ND | 0.01 | µg/L | PFAS | Not Detected |
| lithium LithiumInorganic A naturally occurring alkali metal found in groundwater. Monitored under UCMR 5 to assess occurrence in drinking water. Health EffectsKidney effects at high doses. Low-level exposure effects under study; some research suggests neurological effects. EPA LimitNo MCL (monitoring only under UCMR 5) Common SourcesNatural mineral deposits, geothermal water, and industrial discharge. | 162.000 | HI | µg/L | PFAS | Detected |
| NEtFOSAA | ND | HI | µg/L | PFAS | Not Detected |
| NFDHA | ND | HI | µg/L | PFAS | Not Detected |
| NMeFOSAA | ND | HI | µg/L | PFAS | Not Detected |
| PFBA PFBAPFAS One of the shortest-chain PFAS compounds. Very mobile in water and difficult to remove with standard filtration. Health EffectsThyroid effects, potential developmental toxicity. Shorter half-life in body than long-chain PFAS. EPA LimitNo individual MCL (not yet regulated) Common SourcesDegradation of longer-chain PFAS, industrial discharge, and firefighting foam. | 0.050 | HI | µg/L | PFAS | Detected |
| PFBS PFBSPFAS A short-chain PFAS used as a replacement for PFOS. While it clears the body faster than long-chain PFAS, it still persists in the environment. Health EffectsThyroid effects, reproductive and developmental toxicity, kidney effects. EPA LimitPart of Hazard Index (1.0) Common SourcesIndustrial discharge, firefighting foam, and as a replacement chemical in manufacturing. | 0.009 | HI | µg/L | PFAS | Detected |
| PFDA | ND | HI | µg/L | PFAS | Not Detected |
| PFDoA | ND | HI | µg/L | PFAS | Not Detected |
| PFEESA | ND | HI | µg/L | PFAS | Not Detected |
| PFHpA PFHpAPFAS A medium-chain PFAS compound found in various environmental samples. Less studied than PFOA/PFOS but still considered a contaminant of concern. Health EffectsLiver effects, potential developmental toxicity, and endocrine disruption. EPA LimitPart of Hazard Index (1.0) Common SourcesDegradation of longer-chain PFAS, industrial discharge, and contaminated water sources. | 0.005 | HI | µg/L | PFAS | Detected |
| PFHpS | ND | HI | µg/L | PFAS | Not Detected |
| PFHxA PFHxAPFAS A short-chain PFAS replacement chemical widely used after manufacturers phased out longer-chain PFAS. Very commonly detected in water. Health EffectsLiver and kidney effects, potential thyroid disruption. Considered less toxic than long-chain PFAS but still persistent. EPA LimitNo individual MCL (not yet regulated) Common SourcesIndustrial processes, firefighting foam (AFFF), food packaging, and textile treatment. | 0.011 | HI | µg/L | PFAS | Detected |
| PFHxS PFHxSPFAS A medium-chain PFAS found in firefighting foam and consumer products. It has a long half-life in the human body, similar to long-chain PFAS. Health EffectsImmune system effects, thyroid disruption, and potential reproductive and developmental harm. EPA LimitPart of Hazard Index (1.0) Common SourcesFirefighting foam (AFFF), waterproof textiles, food packaging, and industrial discharge. | 0.015 | HI | µg/L | PFAS | Detected |
| PFMBA | ND | HI | µg/L | PFAS | Not Detected |
| PFMPA | ND | HI | µg/L | PFAS | Not Detected |
| PFNA PFNAPFAS A long-chain PFAS compound used in manufacturing fluoropolymers. It bioaccumulates in the body and is very persistent in the environment. Health EffectsDevelopmental effects, liver toxicity, immune suppression, and potential cancer risk. EPA LimitPart of Hazard Index (1.0) Common SourcesFluoropolymer manufacturing, industrial emissions, and contaminated water sources. | ND | HI | µg/L | PFAS | Not Detected |
| PFOA PFOAPFAS A long-chain PFAS ("forever chemical") once widely used in nonstick coatings and firefighting foam. It persists in the body and environment for years. Health EffectsLinked to kidney and testicular cancer, thyroid disease, elevated cholesterol, and reproductive issues. EPA Limit4.0 ppt MCL Common SourcesIndustrial discharge, firefighting foam (AFFF), nonstick cookware manufacturing, and contaminated groundwater. | 0.004 | 0.004 | µg/L | PFAS | Detected |
| PFOS PFOSPFAS A long-chain PFAS compound historically used in stain-resistant coatings and firefighting foam. One of the most studied and persistent PFAS chemicals. Health EffectsLiver damage, immune system suppression, thyroid disruption, increased cholesterol, and potential cancer risk. EPA Limit4.0 ppt MCL Common SourcesFirefighting foam (AFFF), industrial sites, stain-resistant fabric treatments, and contaminated groundwater. | 0.010 | 0.004 | µg/L | PFAS | Over MCL |
| PFPeA PFPeAPFAS A short-chain PFAS compound commonly detected in drinking water. One of the most frequently found PFAS in UCMR 5 monitoring. Health EffectsLess studied than PFOA/PFOS. Potential liver and thyroid effects. Research is ongoing. EPA LimitNo individual MCL (not yet regulated) Common SourcesIndustrial discharge, firefighting foam degradation, and consumer products. | 0.194 | HI | µg/L | PFAS | Detected |
| PFPeS | ND | HI | µg/L | PFAS | Not Detected |
| PFTA | ND | HI | µg/L | PFAS | Not Detected |
| PFTrDA | ND | HI | µg/L | PFAS | Not Detected |
| PFUnA | ND | HI | µg/L | PFAS | Not Detected |
Data source: EPA SDWIS, UCMR 5, local utility CCR.
Pb Lead in Texas
Cities ranked by 90th-percentile lead PF PFAS in Texas
Cities ranked by compounds detected Cu Copper in Texas
Cities ranked by 90th-percentile copper
Cities ranked by 90th-percentile lead PF PFAS in Texas
Cities ranked by compounds detected Cu Copper in Texas
Cities ranked by 90th-percentile copper
03Houston's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 11018 violations on record, including 929 health-based violations. 3572 remain unresolved.
2017 569 158 open
2018 602 93 open
2019 527 113 open
2020 621 144 open
2021 482 152 open
2022 412 145 open
2023 327 92 open
2024 547 239 open
2025 303 170 open
2026 clean
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
275 health-based in 10 yrs 4115 monitoring & paperwork 1306 still unresolved
PFAS10 PFAS "forever chemical" compounds detectedPFAS levels exceed EPA maximum contaminant levels. Reverse osmosis or activated carbon filtration recommended.
UpdateWater quality data updatedLatest EPA compliance and testing data incorporated into Houston's water quality assessment. Grade: F (27.8/100).
Violation21 drinking water violations recordedContaminants: Lead and Copper Rule, Public Notice, Revised Total Coliform Rule.Open
Violation17 drinking water violations recorded2 health-based. Contaminants: Public Notice, Revised Total Coliform Rule, Long Term 2 Enhanced Surface Water Treatment Rule.Open
Violation21 drinking water violations recorded3 health-based. Contaminants: Public Notice, Revised Total Coliform Rule, Interim Enhanced Surface Water Treatment Rule.Open
DisasterHURRICANE BERYLFederal disaster declaration (FEMA DR-4798). Hurricane event — may have impacted local water infrastructure.
Lead, 90th percentileppb · lower is better
▼ Down 21 ppb since 1992. Latest reading: 1.8 ppb (2025) — 12% of the action level. Sampled at higher-risk homes (90th percentile).
Copper, 90th percentilemg/L · lower is better
▼ Down 0.01 mg/L since 1994. The latest reading (1.5 mg/L, 2025) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Houston's water comes from
Houston's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Source
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Treatment
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
Distribution
719 systems
719 water systems (366 wholesalers), operated under local government ownership.
Delivery
5,913,076 people
Residents served across Houston's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by local government ownership and serves approximately 5,913,076 people through 719 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| CITY OF HOUSTON | TX1010013 | 2,970,543 | Surface Water |
| CLEAR LAKE CITY WATER AUTHORITY | TX1010056 | 89,702 | Purchased Surface Water |
| CITY OF HOUSTON UD 5 - KINGWOOD | TX1010348 | 80,073 | Groundwater |
| HARRIS COUNTY MUD 165 | TX1012187 | 30,483 | Purchased Surface Water |
| BRIDGESTONE MUD | TX1011550 | 24,528 | Purchased Surface Water |
| TIMBER LANE UTILITY DISTRICT | TX1010278 | 24,507 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 5 | TX1010884 | 23,766 | Purchased Surface Water |
| HARRIS COUNTY FWSD 51 | TX1010238 | 19,671 | Purchased Surface Water |
| CIMARRON MUD | TX1011410 | 19,338 | Groundwater |
| HARRIS COUNTY MUD 82 | TX1010630 | 18,990 | Groundwater |
| NORTHWEST PARK MUD | TX1010593 | 18,168 | Groundwater |
| CLEAR BROOK CITY MUD | TX1010418 | 18,108 | Purchased Surface Water |
| HARRIS MONTGOMERY COUNTIES MUD 386 | TX1013305 | 18,018 | Purchased Groundwater |
| HARRIS COUNTY MUD 53 | TX1010720 | 17,856 | Purchased Surface Water |
| HARRIS COUNTY MUD 71 | TX1011823 | 17,079 | Groundwater |
| HARRIS COUNTY MUD 26 | TX1010715 | 16,518 | Groundwater |
| HARRIS COUNTY MUD 55 HERITAGE PARK | TX1010678 | 16,392 | Purchased Surface Water |
| HARRIS COUNTY MUD 167 | TX1012842 | 15,837 | Groundwater |
| FORT BEND COUNTY MUD 30 | TX0790146 | 15,798 | Purchased Surface Water |
| HARRIS COUNTY FWSD 61 | TX1010237 | 15,400 | Groundwater |
| PECAN GROVE MUD | TX0790132 | 14,913 | Surface Water |
| HARRIS COUNTY MUD 200 CRANBROOK | TX1012007 | 14,868 | Purchased Surface Water |
| HARRIS COUNTY MUD 24 | TX1010572 | 14,796 | Purchased Surface Water |
| CNP UTILITY DISTRICT | TX1010429 | 14,718 | Purchased Surface Water |
| HARRIS COUNTY MUD 285 | TX1012677 | 14,268 | Purchased Surface Water |
| CITY OF HOUSTON WILLOW CHASE | TX1011902 | 14,169 | Groundwater |
| HARRIS COUNTY MUD 105 | TX1011227 | 14,151 | Purchased Surface Water |
| MEADOWHILL REGIONAL MUD | TX1010387 | 13,863 | Groundwater |
| REMINGTON MUD 1 | TX1013074 | 13,743 | Purchased Surface Water |
| FORT BEND COUNTY MUD 23 | TX0790237 | 13,548 | Groundwater |
| SOUTHERN MONTGOMERY COUNTY MUD | TX1700073 | 13,372 | Purchased Surface Water |
| NEWPORT MUD | TX1010362 | 13,191 | Surface Water |
| HARRIS COUNTY MUD 1 | TX1010539 | 12,342 | Groundwater |
| NORTHAMPTON MUD | TX1010337 | 12,162 | Groundwater |
| HARRIS COUNTY MUD 157 | TX1011430 | 12,087 | Purchased Surface Water |
| HARRIS COUNTY MUD 368 | TX1011908 | 11,835 | Purchased Surface Water |
| FORT BEND COUNTY MUD 142 | TX0790429 | 11,595 | Purchased Surface Water |
| RAYFORD ROAD MUD | TX1700334 | 11,550 | Purchased Surface Water |
| HARRIS COUNTY MUD 81 | TX1010581 | 11,514 | Groundwater |
| MEMORIAL VILLAGES WATER AUTHORITY | TX1010148 | 11,382 | Purchased Surface Water |
| HARRIS COUNTY UTILITY DISTRICT 6 | TX1010501 | 11,262 | Purchased Surface Water |
| HARRIS COUNTY WCID 36 | TX1010239 | 11,073 | Purchased Surface Water |
| CYPRESS HILL MUD 1 | TX1012378 | 11,052 | Groundwater |
| HARRIS COUNTY MUD 120 | TX1010774 | 10,983 | Groundwater |
| HARRIS COUNTY MUD 49 | TX1011462 | 10,893 | Purchased Surface Water |
| FORT BEND COUNTY MUD 58 | TX0790458 | 10,629 | Purchased Surface Water |
| HARRIS COUNTY MUD 278 | TX1012835 | 10,584 | Purchased Surface Water |
| HARRIS COUNTY WCID 96 | TX1013175 | 10,530 | Groundwater |
| GREENWOOD UTILITY DISTRICT | TX1010554 | 10,527 | Purchased Surface Water |
| FORT BEND COUNTY MUD 182 | TX0790500 | 10,498 | Groundwater |
| HARRIS COUNTY MUD 489 | TX1013628 | 10,476 | Purchased Groundwater |
| HARRIS COUNTY MUD 230 | TX1012740 | 10,404 | Purchased Surface Water |
| HARRIS COUNTY MUD 102 | TX1010503 | 10,401 | Purchased Surface Water |
| LANGHAM CREEK UTILITY DISTRICT | TX1011249 | 10,377 | Purchased Surface Water |
| FORT BEND COUNTY MUD 151 | TX0790443 | 10,233 | Groundwater |
| MISSION BEND MUD 2 | TX1011826 | 10,155 | Groundwater |
| HARRIS COUNTY WCID 109 | TX1010359 | 10,134 | Purchased Surface Water |
| PONDEROSA FOREST UTILITY DISTRICT | TX1010384 | 10,101 | Groundwater |
| HARRIS COUNTY WCID 110 | TX1010482 | 9,807 | Groundwater |
| HARRIS COUNTY MUD 109 | TX1010620 | 9,501 | Groundwater |
| TRAIL OF THE LAKES MUD | TX1010617 | 9,471 | Groundwater |
| HARRIS COUNTY MUD 188 | TX1011982 | 9,453 | Purchased Surface Water |
| HUNTERS GLEN MUD | TX1010615 | 9,405 | Groundwater |
| HARRIS COUNTY WCID 119 | TX1010509 | 9,150 | Purchased Surface Water |
| HARRIS COUNTY WCID 89 | TX1012370 | 9,033 | Purchased Surface Water |
| BARKER CYPRESS MUD | TX1011613 | 8,976 | Purchased Surface Water |
| SUNBELT FWSD HIGH MEADOWS SUBDIVISION | TX1010292 | 8,946 | Purchased Surface Water |
| CHELFORD CITY MUD | TX1010782 | 8,917 | Groundwater |
| HARRIS COUNTY MUD 391 | TX1013253 | 8,835 | Groundwater |
| NORTH MISSION GLEN MUD | TX0790174 | 8,730 | Purchased Surface Water |
| HARRIS COUNTY MUD 132 | TX1010616 | 8,682 | Groundwater |
| KINGSBRIDGE MUD | TX0790158 | 8,663 | Purchased Surface Water |
| HARRIS COUNTY MUD 150 | TX1011250 | 8,454 | Purchased Surface Water |
| RICE UNIVERSITY | TX1010908 | 8,415 | Purchased Surface Water |
| JACKRABBIT ROAD PUD | TX1010538 | 8,346 | Purchased Surface Water |
| HARRIS COUNTY MUD 154 | TX1011642 | 8,289 | Groundwater |
| HARRIS COUNTY MUD 290 | TX1013294 | 8,259 | Purchased Groundwater |
| WEST HARRIS COUNTY MUD 11 | TX1012858 | 8,205 | Groundwater |
| BISSONNET MUD | TX1010883 | 8,160 | Groundwater |
| WEST PARK MUD | TX1011930 | 8,106 | Groundwater |
| HARRIS COUNTY MUD 153 | TX1012133 | 8,013 | Groundwater |
| HARRIS-FORT BEND COUNTIES MUD 3 | TX1013365 | 7,971 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 9 | TX1011599 | 7,848 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 12 | TX1011901 | 7,839 | Groundwater |
| SIENNA MUD 10 | TX0790452 | 7,824 | Purchased Groundwater |
| FIRST COLONY MUD 9 | TX0790230 | 7,818 | Groundwater |
| HARRIS COUNTY MUD 468 | TX1013369 | 7,683 | Purchased Surface Water |
| NORTHWEST HARRIS COUNTY MUD 10 | TX1011649 | 7,671 | Groundwater |
| CY CHAMP PUD | TX1011522 | 7,596 | Groundwater |
| BLUE RIDGE WEST MUD | TX0790051 | 7,545 | Groundwater |
| HARRIS COUNTY MUD 151 | TX1010905 | 7,464 | Groundwater |
| HARRIS COUNTY MUD 419 | TX1013335 | 7,389 | Purchased Groundwater |
| SIENNA MUD 3 | TX0790376 | 7,365 | Purchased Groundwater |
| FORT BEND COUNTY MUD 133 | TX0790444 | 7,362 | Purchased Surface Water |
| FORT BEND COUNTY MUD 134B | TX0790532 | 7,356 | Purchased Groundwater |
| CYPRESS FOREST PUD | TX1010919 | 7,356 | Groundwater |
| EMERALD FOREST UTILITY DISTRICT | TX1010541 | 7,326 | Groundwater |
| PARKWAY UTILITY DISTRICT | TX1010750 | 7,323 | Groundwater |
| HARRIS COUNTY MUD 152 | TX1010902 | 7,314 | Groundwater |
| FORT BEND COUNTY MUD 134C | TX0790533 | 7,260 | Purchased Groundwater |
| HARRIS COUNTY MUD 504 | TX1013522 | 7,242 | Purchased Surface Water |
| MALCOMSON ROAD UTILITY DISTRICT | TX1010495 | 7,231 | Purchased Surface Water |
| HARRIS COUNTY MUD 449 | TX1013372 | 7,179 | Groundwater |
| WINDFERN FOREST UTILITY DISTRICT | TX1010924 | 7,170 | Purchased Surface Water |
| LAKE FOREST UTILITY DISTRICT | TX1010494 | 7,106 | Groundwater |
| NOTTINGHAM COUNTRY MUD | TX1012315 | 7,089 | Groundwater |
| HARRIS COUNTY MUD 196 | TX1013002 | 7,026 | Purchased Surface Water |
| ADDICKS UTILITY DISTRICT | TX1011019 | 7,017 | Purchased Surface Water |
| HARRIS COUNTY MUD 96 | TX1013343 | 6,993 | Purchased Surface Water |
| SAGEMEADOW UTILITY DISTRICT | TX1010386 | 6,987 | Purchased Surface Water |
| REID ROAD MUD 1 | TX1010872 | 6,969 | Groundwater |
| BRAZORIA COUNTY MUD 6 | TX0200578 | 6,926 | Purchased Groundwater |
| WEST HARRIS COUNTY MUD 2 CHASE | TX1011029 | 6,921 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 15 | TX1011600 | 6,915 | Groundwater |
| HARRIS COUNTY MUD 189 | TX1011809 | 6,906 | Groundwater |
| FORT BEND COUNTY MUD 2 | TX0790038 | 6,819 | Purchased Surface Water |
| HARRIS COUNTY MUD 158 | TX1012297 | 6,798 | Purchased Groundwater |
| HARRIS COUNTY MUD 367 | TX1013040 | 6,759 | Purchased Surface Water |
| HARRIS COUNTY MUD 64 | TX1011513 | 6,726 | Groundwater |
| FALLBROOK UTILITY DISTRICT | TX1010340 | 6,720 | Groundwater |
| MILLS ROAD MUD | TX1011107 | 6,717 | Purchased Surface Water |
| NORTH PARK PUD | TX1010745 | 6,708 | Groundwater |
| DOWDELL PUD | TX1010592 | 6,705 | Groundwater |
| WESTON MUD | TX1010634 | 6,699 | Groundwater |
| WEST HARRIS COUNTY MUD 10 | TX1012068 | 6,697 | Groundwater |
| HARRIS COUNTY MUD 118 | TX1010897 | 6,678 | Groundwater |
| GRAND MISSION MUD 1 | TX0790430 | 6,663 | Purchased Surface Water |
| HARRIS COUNTY MUD 433 | TX1013350 | 6,651 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 119 SPRING TRAILS | TX1700773 | 6,621 | Groundwater |
| HEATHERLOCH MUD | TX1010548 | 6,612 | Purchased Surface Water |
| HORSEPEN BAYOU MUD | TX1011785 | 6,597 | Purchased Surface Water |
| INTERSTATE MUD | TX1012264 | 6,591 | Groundwater |
| HARRIS COUNTY MUD 354 | TX1012965 | 6,588 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 15 | TX1700118 | 6,564 | Groundwater |
| HARRIS COUNTY WCID 84 | TX1010113 | 6,552 | Purchased Surface Water |
| MISSION BEND MUD 1 | TX1011718 | 6,546 | Groundwater |
| SUNBELT FWSD OAKWILDE SUBDIVISION | TX1010022 | 6,495 | Purchased Surface Water |
| BIG OAKS MUD | TX0790332 | 6,450 | Purchased Surface Water |
| SIENNA MUD 4 | TX0790489 | 6,435 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 95 | TX1700779 | 6,435 | Purchased Surface Water |
| HARRIS COUNTY MUD 65 | TX1011678 | 6,330 | Groundwater |
| FORT BEND COUNTY MUD 35 | TX0790433 | 6,297 | Purchased Groundwater |
| GRAND MISSION MUD 2 | TX0790449 | 6,285 | Purchased Groundwater |
| FORT BEND COUNTY MUD 50 | TX0790277 | 6,234 | Purchased Surface Water |
| CINCO MUD 14 | TX0790422 | 6,192 | Purchased Groundwater |
| GALVESTON COUNTY WCID 12 | TX0840031 | 6,189 | Purchased Surface Water |
| HARRIS COUNTY MUD 364 | TX1013132 | 6,168 | Purchased Groundwater |
| HARRIS COUNTY MUD 222 | TX1013054 | 6,129 | Groundwater |
| CITY OF HOUSTON DISTRICT 73 | TX1011585 | 6,105 | Groundwater |
| CINCO SOUTHWEST MUD 4 | TX0790522 | 6,093 | Purchased Surface Water |
| HARRIS COUNTY MUD 400 - EAST | TX1013416 | 6,066 | Purchased Surface Water |
| HARRIS COUNTY UD 16 | TX1013156 | 6,063 | Groundwater |
| LAKE MUD | TX1011741 | 6,048 | Purchased Surface Water |
| FORT BEND COUNTY MUD 146 | TX0790435 | 5,985 | Purchased Surface Water |
| HARRIS COUNTY MUD 16 | TX1011705 | 5,982 | Purchased Surface Water |
| HARRIS COUNTY MUD 457 | TX1013576 | 5,967 | Purchased Groundwater |
| WEST HARRIS COUNTY MUD 9 | TX1011798 | 5,961 | Groundwater |
| MONTGOMERY COUNTY MUD 9 | TX1700220 | 5,949 | Groundwater |
| PRESTONWOOD FOREST UTILITY DISTRICT | TX1010467 | 5,940 | Purchased Surface Water |
| HARRIS COUNTY MUD 43 | TX1010565 | 5,940 | Groundwater |
| BRAZORIA COUNTY MUD 29 | TX0200612 | 5,898 | Groundwater |
| HARRIS COUNTY MUD 180 | TX1011799 | 5,892 | Groundwater |
| HARRIS COUNTY WCID 74 | TX1010480 | 5,886 | Groundwater |
| CHARTERWOOD MUD | TX1010632 | 5,832 | Groundwater |
| HARRIS COUNTY MUD 70 | TX1011690 | 5,763 | Purchased Surface Water |
| HARRIS COUNTY MUD 319 | TX1013563 | 5,751 | Groundwater |
| CINCO MUD 8 | TX0790324 | 5,613 | Purchased Groundwater |
| SPENCER ROAD PUD | TX1010654 | 5,607 | Purchased Surface Water |
| HARRIS COUNTY MUD 239 | TX1012392 | 5,583 | Groundwater |
| FORT BEND COUNTY MUD 162 | TX0790459 | 5,553 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 19 | TX1011927 | 5,535 | Groundwater |
| HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE | TX1013450 | 5,526 | Purchased Groundwater |
| FORT BEND COUNTY MUD 34 | TX0790200 | 5,523 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 139 | TX1700832 | 5,523 | Groundwater |
| CINCO SOUTHWEST MUD 2 | TX0790481 | 5,496 | Purchased Surface Water |
| HARRIS COUNTY MUD 5 | TX1010500 | 5,487 | Purchased Surface Water |
| HARRIS COUNTY MUD 163 | TX1012213 | 5,487 | Purchased Surface Water |
| HARRIS COUNTY MUD 502 | TX1013494 | 5,487 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 8 | TX1700176 | 5,472 | Groundwater |
| MONTGOMERY COUNTY MUD 112 | TX1700762 | 5,454 | Groundwater |
| HARRIS COUNTY MUD 148 KINGSLAKE | TX1010938 | 5,448 | Purchased Surface Water |
| FORT BEND COUNTY MUD 26 QUAIL GREEN WEST | TX0790137 | 5,424 | Groundwater |
| FULSHEAR MUD 3A | TX0790560 | 5,421 | Groundwater |
| HARRIS COUNTY MUD 46 | TX1010903 | 5,418 | Groundwater |
| CHIMNEY HILL MUD | TX1010910 | 5,409 | Purchased Surface Water |
| TATTOR ROAD MUD | TX1010625 | 5,400 | Groundwater |
| BILMA PUD | TX1011872 | 5,397 | Purchased Surface Water |
| HARRIS COUNTY MUD 86 | TX1012953 | 5,397 | Purchased Surface Water |
| ROLLING CREEK UTILITY DISTRICT | TX1012877 | 5,388 | Purchased Surface Water |
| FORT BEND COUNTY MUD 118 | TX0790366 | 5,346 | Purchased Surface Water |
| MOUNT HOUSTON ROAD MUD | TX1010728 | 5,346 | Groundwater |
| WESTADOR MUD | TX1010277 | 5,337 | Purchased Surface Water |
| FORT BEND COUNTY MUD 57 | TX0790455 | 5,335 | Purchased Surface Water |
| CORNERSTONES MUD | TX1011692 | 5,331 | Groundwater |
| BRAZORIA COUNTY MUD 22 | TX0200706 | 5,310 | Purchased Groundwater |
| FORT BEND COUNTY MUD 155 | TX0790488 | 5,292 | Purchased Surface Water |
| WEST HARRIS COUNTY MUD 7 | TX1012228 | 5,289 | Groundwater |
| BRAZORIA COUNTY MUD 25 | TX0200615 | 5,250 | Groundwater |
| HARRIS COUNTY MUD 127 | TX1012229 | 5,247 | Purchased Surface Water |
| BRAZORIA COUNTY MUD 55 | TX0200659 | 5,229 | Groundwater |
| HARRIS COUNTY MUD 400 - WEST | TX1013310 | 5,217 | Purchased Surface Water |
| FORT BEND COUNTY MUD 194 | TX0790543 | 5,211 | Purchased Groundwater |
| FORT BEND COUNTY MUD 143 WATER VIEW ESTA | TX0790472 | 5,196 | Groundwater |
| CINCO SOUTHWEST MUD 3 DAYCARE | TX0790521 | 5,187 | Purchased Surface Water |
| SIENNA MUD 6 | TX0790491 | 5,184 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 94 | TX1700716 | 5,184 | Groundwater |
| HARRIS COUNTY MUD 33 | TX1011162 | 5,181 | Groundwater |
| DENTON COUNTY FWSD 11-A | TX0610259 | 5,160 | Purchased Surface Water |
| HARRIS COUNTY WCID 114 | TX1010317 | 5,160 | Purchased Surface Water |
| HARRIS COUNTY MUD 179 | TX1011848 | 5,115 | Purchased Surface Water |
| HARRIS COUNTY WCID 133 | TX1010210 | 5,109 | Groundwater |
| MAYDE CREEK MUD | TX1011689 | 5,100 | Groundwater |
| BRAZORIA COUNTY MUD 31 | TX0200645 | 5,097 | Groundwater |
| HARRIS COUNTY MUD 276 | TX1012942 | 5,094 | Purchased Surface Water |
| FORT BEND COUNTY MUD 119 | TX0790382 | 5,088 | Purchased Surface Water |
| FORT BEND COUNTY MUD 190 | TX0790501 | 5,049 | Purchased Surface Water |
| HARRIS COUNTY IMPROVEMENT DISTRICT 18 | TX1013479 | 5,025 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 32 | TX1013034 | 5,016 | Groundwater |
| HARRIS COUNTY MUD 495 | TX1013532 | 5,007 | Groundwater |
| RICEWOOD MUD | TX1012227 | 4,989 | Groundwater |
| MONTGOMERY COUNTY UD 4 | TX1700286 | 4,980 | Groundwater |
| NORTH GREEN MUD | TX1010331 | 4,941 | Groundwater |
| FORT BEND COUNTY MUD 121 | TX0790393 | 4,932 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 89 | TX1700717 | 4,899 | Groundwater |
| HARRIS COUNTY MUD 383 | TX1013213 | 4,881 | Purchased Surface Water |
| KLEINWOOD MUD | TX1010440 | 4,872 | Purchased Surface Water |
| HARRIS COUNTY MUD 221 | TX1012972 | 4,839 | Groundwater |
| LOUETTA NORTH PUD | TX1011870 | 4,836 | Purchased Surface Water |
| BRAZORIA COUNTY MUD 21 | TX0200610 | 4,833 | Groundwater |
| FORT BEND COUNTY MUD 116 CANYON GATE | TX0790367 | 4,833 | Groundwater |
| HARRIS COUNTY MUD 432 | TX1013378 | 4,782 | Groundwater |
| HARRIS COUNTY MUD 119 | TX1010626 | 4,758 | Groundwater |
| HARRIS COUNTY WCID 92 | TX1010124 | 4,752 | Groundwater |
| CINCO MUD 2 | TX0790306 | 4,743 | Purchased Groundwater |
| HARRIS COUNTY MUD 501 | TX1013403 | 4,740 | Purchased Surface Water |
| HARRIS COUNTY MUD 360 | TX1012897 | 4,707 | Groundwater |
| HARRIS COUNTY MUD 106 | TX1013160 | 4,668 | Groundwater |
| HARRIS FORT BEND COUNTIES MUD 5 | TX0790347 | 4,641 | Groundwater |
| HARRIS COUNTY MUD 185 | TX1011914 | 4,617 | Purchased Surface Water |
| FOUNTAINHEAD MUD | TX1010435 | 4,614 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 115 | TX1700770 | 4,599 | Purchased Groundwater |
| FORT BEND COUNTY MUD 152 | TX0790487 | 4,575 | Purchased Surface Water |
| HARRIS COUNTY MUD 130 | TX1012097 | 4,572 | Purchased Surface Water |
| CHELFORD ONE MUD | TX1010767 | 4,557 | Groundwater |
| SUNBELT FWSD WOODLAND OAKS SUBDIVISION | TX1010758 | 4,527 | Purchased Surface Water |
| HARRIS COUNTY MUD 344 | TX1012974 | 4,518 | Purchased Surface Water |
| HARRIS COUNTY MUD 284 | TX1013114 | 4,506 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 23 | TX1011746 | 4,470 | Groundwater |
| RENN ROAD MUD | TX1011834 | 4,464 | Groundwater |
| HARRIS COUNTY MUD 365 | TX1013009 | 4,461 | Groundwater |
| HARRIS COUNTY MUD 69 | TX1010600 | 4,458 | Groundwater |
| HARRIS COUNTY MUD 370 | TX1013113 | 4,452 | Purchased Surface Water |
| HARRIS COUNTY MUD 104 | TX1011534 | 4,449 | Purchased Surface Water |
| CLAY ROAD MUD | TX1011681 | 4,443 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 19 | TX1700319 | 4,422 | Groundwater |
| HARRIS COUNTY MUD 397 | TX1013295 | 4,413 | Purchased Groundwater |
| HARRIS COUNTY MUD 172 | TX1012970 | 4,404 | Purchased Surface Water |
| FORT BEND COUNTY MUD 42 WAT PLAT | TX0790254 | 4,395 | Groundwater |
| KINGS MANOR MUD | TX1012865 | 4,377 | Groundwater |
| FORT BEND COUNTY MUD 165 | TX0790470 | 4,314 | Purchased Surface Water |
| SIENNA MUD 12 | TX0790494 | 4,311 | Groundwater |
| CYPRESSWOOD UTILITY DISTRICT | TX1010432 | 4,305 | Purchased Surface Water |
| HARRIS COUNTY MUD 322 | TX1012542 | 4,266 | Purchased Groundwater |
| PLANTATION MUD | TX0790112 | 4,263 | Groundwater |
| CINCO MUD 7 | TX0790343 | 4,239 | Purchased Groundwater |
| HARRIS COUNTY MUD 166 | TX1013181 | 4,239 | Purchased Surface Water |
| BRAZORIA COUNTY MUD 3 | TX0200560 | 4,230 | Purchased Groundwater |
| CITY OF SPRING VALLEY VILLAGE | TX1010214 | 4,229 | Groundwater |
| SPRING MEADOWS MUD | TX1013261 | 4,200 | Purchased Surface Water |
| HARRIS COUNTY MUD 536 | TX1013515 | 4,188 | Groundwater |
| FORT BEND COUNTY MUD 41 | TX0790229 | 4,179 | Purchased Surface Water |
| SIENNA PLANTATION MANAGEMENT DISTRICT | TX0790493 | 4,179 | Groundwater |
| BRAZORIA - FORT BEND COUNTIES MUD 3 | TX0790597 | 4,149 | Groundwater |
| FORT BEND COUNTY MUD 123 | TX0790446 | 4,143 | Purchased Surface Water |
| CHAMPIONS MUD | TX1010233 | 4,098 | Groundwater |
| HARRIS-WALLER COUNTIES MUD 5 | TX2370138 | 4,098 | Purchased Groundwater |
| HARRIS COUNTY MUD 18 HEATHERWOOD HUNTERS | TX1010512 | 4,083 | Purchased Surface Water |
| VALLEY RANCH MUD 1 | TX1700752 | 4,056 | Purchased Groundwater |
| HARRIS COUNTY MUD 423 | TX1013691 | 4,044 | Purchased Surface Water |
| HARRIS COUNTY MUD 342 | TX1012973 | 4,035 | Purchased Groundwater |
| EAST MONTGOMERY COUNTY MUD 7 | TX1700881 | 4,035 | Purchased Groundwater |
| HARRIS COUNTY MUD 186 | TX1012214 | 4,005 | Purchased Surface Water |
| HARRIS COUNTY MUD 183 | TX1011824 | 3,981 | Purchased Surface Water |
| FORT BEND COUNTY MUD 48 | TX0790267 | 3,969 | Purchased Groundwater |
| CYPRESS KLEIN UTILITY DISTRICT WIMBLETON | TX1010431 | 3,960 | Groundwater |
| EAST MONTGOMERY COUNTY MUD 6 | TX1700753 | 3,939 | Purchased Groundwater |
| HARRIS COUNTY MUD 6 CARRIAGE LANE | TX1010496 | 3,936 | Purchased Surface Water |
| SOUTHERN WATER | TX1010012 | 3,933 | Groundwater |
| WESTLAKE MUD 1 | TX1010635 | 3,909 | Groundwater |
| NORTHGATE CROSSING MUD 1 | TX1013077 | 3,906 | Groundwater |
| DENTON COUNTY FWSD 11-B | TX0610256 | 3,897 | Purchased Surface Water |
| HARRIS COUNTY MUD 173 | TX1012971 | 3,894 | Purchased Surface Water |
| GRAND LAKES MUD 4 | TX0790356 | 3,867 | Purchased Surface Water |
| FORT BEND COUNTY MUD 81 WESTON LAKES | TX0790268 | 3,855 | Groundwater |
| HARRIS COUNTY MUD 345 | TX1012768 | 3,843 | Groundwater |
| CINCO MUD 9 | TX0790307 | 3,828 | Purchased Groundwater |
| MONTGOMERY COUNTY UD 3 | TX1700116 | 3,825 | Groundwater |
| HARRIS COUNTY MUD 401 | TX1013289 | 3,813 | Groundwater |
| HARRIS FORT BEND COUNTIES MUD 1 | TX0790216 | 3,812 | Purchased Groundwater |
| NORTHWEST HARRIS COUNTY MUD 30 | TX1012951 | 3,804 | Purchased Surface Water |
| CITY OF BUNKER HILL VILLAGE | TX1010106 | 3,771 | Purchased Surface Water |
| NORTHGATE CROSSING MUD 2 | TX1013078 | 3,753 | Groundwater |
| POSTWOOD MUD | TX1010631 | 3,747 | Groundwater |
| ENCANTO REAL UTILITY DISTRICT | TX1010687 | 3,717 | Groundwater |
| FRY ROAD MUD | TX1011679 | 3,696 | Groundwater |
| NORTHWEST FREEWAY MUD | TX1011256 | 3,678 | Groundwater |
| MONTGOMERY COUNTY MUD 99 | TX1700749 | 3,675 | Purchased Surface Water |
| FORT BEND COUNTY MUD 229 | TX0790602 | 3,666 | Groundwater |
| FORT BEND COUNTY MUD 185 | TX0790478 | 3,663 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 36 | TX1012848 | 3,648 | Purchased Surface Water |
| HARRIS COUNTY MUD 11 | TX1010426 | 3,645 | Groundwater |
| HARRIS COUNTY MUD 208 | TX1012419 | 3,642 | Purchased Surface Water |
| HARRIS COUNTY WCID 116 | TX1010507 | 3,627 | Groundwater |
| HARRIS COUNTY MUD 216 | TX1012577 | 3,627 | Groundwater |
| EL DORADO UTILITY DISTRICT | TX1010471 | 3,591 | Groundwater |
| FORT BEND COUNTY MUD 222 | TX0790607 | 3,582 | Purchased Groundwater |
| HARRIS COUNTY MUD 264 | TX1012330 | 3,573 | Purchased Surface Water |
| HARRIS COUNTY MUD 281 | TX1013178 | 3,573 | Groundwater |
| BRAZORIA COUNTY MUD 2 | TX0200386 | 3,567 | Groundwater |
| HARRIS COUNTY MUD 149 | TX1011296 | 3,543 | Groundwater |
| HARRIS COUNTY MUD 62 | TX1012285 | 3,519 | Groundwater |
| HARRIS COUNTY MUD 287 | TX1013385 | 3,510 | Purchased Groundwater |
| KLEIN PUD | TX1011143 | 3,504 | Groundwater |
| HARRIS COUNTY WCID 132 | TX1010413 | 3,501 | Purchased Surface Water |
| HARRIS COUNTY MUD 257 | TX1012985 | 3,501 | Purchased Surface Water |
| PINE VILLAGE PUD | TX1010901 | 3,498 | Purchased Surface Water |
| HARRIS COUNTY UD 15 | TX1011778 | 3,489 | Purchased Groundwater |
| HARRIS COUNTY MUD 412 | TX1013354 | 3,480 | Purchased Surface Water |
| WILLOW CREEK FARMS MUD | TX2370089 | 3,453 | Groundwater |
| OAKMONT PUD | TX1012981 | 3,450 | Groundwater |
| WEST HARRIS COUNTY MUD 6 | TX1011258 | 3,435 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 20 | TX1011998 | 3,429 | Groundwater |
| HARRIS COUNTY MUD 249 | TX1013135 | 3,420 | Groundwater |
| GRANT ROAD PUD | TX1011991 | 3,393 | Purchased Surface Water |
| MONTGOMERY COUNTY UD 2 | TX1700115 | 3,381 | Groundwater |
| FORT BEND COUNTY MUD 122 | TX0790416 | 3,366 | Purchased Surface Water |
| WEST HARRIS COUNTY MUD 17 | TX1012238 | 3,354 | Groundwater |
| FORT BEND COUNTY FWSD 1 | TX0790474 | 3,309 | Groundwater |
| HARRIS COUNTY MUD 558 | TX1013698 | 3,300 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 105 | TX1700837 | 3,282 | Groundwater |
| HARRIS COUNTY MUD 8 | TX1010712 | 3,271 | Purchased Surface Water |
| HARRIS COUNTY MUD 282 | TX1013375 | 3,237 | Purchased Groundwater |
| POINT AQUARIUS MUD | TX1700060 | 3,228 | Groundwater |
| SUNBELT FWSD NORTHLINE TERRACE | TX1010117 | 3,225 | Groundwater |
| GRAND LAKES MUD 1 | TX0790410 | 3,219 | Purchased Surface Water |
| HARRIS COUNTY MUD 144 | TX1010923 | 3,219 | Purchased Surface Water |
| HARRIS COUNTY MUD 396 | TX1013338 | 3,201 | Purchased Groundwater |
| HARRIS COUNTY WCID 136 | TX1010355 | 3,192 | Groundwater |
| WOODCREEK MUD | TX1011237 | 3,192 | Groundwater |
| HARRIS COUNTY MUD 23 | TX1010649 | 3,170 | Purchased Surface Water |
| NORTHWEST HARRIS COUNTY MUD 22 | TX1011745 | 3,156 | Purchased Surface Water |
| FORT BEND COUNTY MUD 130 | TX0790371 | 3,150 | Groundwater |
| HARRIS COUNTY WCID FONDREN ROAD | TX1010249 | 3,144 | Purchased Surface Water |
| HARRIS COUNTY WCID 161 | TX1013612 | 3,129 | Purchased Surface Water |
| TERRANOVA WEST MUD | TX1011226 | 3,120 | Purchased Surface Water |
| FORT BEND COUNTY MUD 131 | TX0790450 | 3,114 | Groundwater |
| DENTON COUNTY FWSD 8-B | TX0610252 | 3,090 | Purchased Surface Water |
| BAYBROOK MUD 1 | TX1012698 | 3,087 | Purchased Surface Water |
| WOOD TRACE MUD 1 | TX1700642 | 3,084 | Groundwater |
| CINCO MUD 6 | TX0790316 | 3,048 | Purchased Groundwater |
| BRAZORIA COUNTY MUD 39 | TX0200650 | 3,036 | Purchased Groundwater |
| HARRIS COUNTY MUD 147 | TX1011243 | 3,003 | Groundwater |
| HARRIS COUNTY WCID 91 | TX1010063 | 3,000 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 29 | TX1012293 | 3,000 | Groundwater |
| CYPRESS CREEK UTILITY DISTRICT | TX1010430 | 2,988 | Purchased Surface Water |
| GREEN TRAILS MUD | TX1011839 | 2,982 | Groundwater |
| HARRIS COUNTY MUD 399 | TX1013346 | 2,967 | Purchased Groundwater |
| HARRIS COUNTY MUD 480 | TX1013400 | 2,964 | Groundwater |
| DENTON COUNTY FWSD 8-A | TX0610258 | 2,955 | Purchased Surface Water |
| FOREST HILLS MUD | TX1011252 | 2,955 | Groundwater |
| SUNBELT FWSD HEATHER GLEN SUBDIVISION | TX1010419 | 2,943 | Groundwater |
| HARRIS COUNTY MUD 202 | TX1012356 | 2,940 | Groundwater |
| BRAZORIA COUNTY MUD 53 | TX0200764 | 2,910 | Groundwater |
| GALVESTON COUNTY MUD 12 | TX0840021 | 2,900 | Purchased Surface Water |
| HARRIS COUNTY MUD 280 | TX1013063 | 2,898 | Purchased Groundwater |
| FORT BEND COUNTY MUD 47 | TX0790220 | 2,874 | Purchased Groundwater |
| HARRIS COUNTY MUD 434 | TX1013373 | 2,859 | Groundwater |
| RANKIN ROAD WEST MUD | TX1012354 | 2,838 | Purchased Surface Water |
| EAST MONTGOMERY COUNTY MUD 12 | TX1700898 | 2,838 | Groundwater |
| HARRIS COUNTY MUD 155 | TX1012351 | 2,829 | Purchased Surface Water |
| MORTON ROAD MUD | TX1011685 | 2,817 | Purchased Surface Water |
| FORT BEND COUNTY MUD 141 | TX0790451 | 2,790 | Groundwater |
| TIMBERLAKE IMPROVEMENT DISTRICT | TX1010447 | 2,775 | Groundwater |
| NORTH BELT UTILITY DISTRICT | TX1011737 | 2,775 | Groundwater |
| HARRIS COUNTY UD 14 | TX1011781 | 2,769 | Groundwater |
| MONTGOMERY COUNTY MUD 98 | TX1700746 | 2,766 | Purchased Surface Water |
| NORTHWEST HARRIS COUNTY MUD 16 | TX1011603 | 2,742 | Groundwater |
| FORT BEND COUNTY MUD 134E | TX0790574 | 2,733 | Groundwater |
| WEST HARRIS COUNTY MUD 14 | TX1012002 | 2,727 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 138 | TX1700988 | 2,712 | Purchased Groundwater |
| HARRIS COUNTY MUD 389 | TX1013265 | 2,676 | Groundwater |
| HARRIS COUNTY MUD 162 | TX1011612 | 2,661 | Purchased Surface Water |
| BRAZORIA COUNTY MUD 56 | TX0200676 | 2,643 | Groundwater |
| SPRING WEST MUD | TX1013017 | 2,639 | Groundwater |
| HARRIS COUNTY MUD 372 | TX1013141 | 2,613 | Purchased Surface Water |
| HARRIS COUNTY MUD 542 | TX1013573 | 2,592 | Groundwater |
| CINCO MUD 10 | TX0790386 | 2,583 | Purchased Groundwater |
| HARRIS COUNTY MUD 371 | TX1013107 | 2,577 | Purchased Surface Water |
| HARRIS COUNTY FWSD 1A | TX1010082 | 2,560 | Purchased Surface Water |
| PALMER PLANTATION MUD 2 | TX0790323 | 2,559 | Groundwater |
| MONTGOMERY COUNTY MUD 84 | TX1700743 | 2,553 | Purchased Groundwater |
| BAMMEL UTILITY DISTRICT | TX1010365 | 2,550 | Groundwater |
| FORT BEND COUNTY MUD 124 | TX0790412 | 2,544 | Groundwater |
| HARRIS COUNTY MUD 215 | TX1012812 | 2,541 | Groundwater |
| HARRIS COUNTY MUD 217 | TX1011983 | 2,538 | Purchased Surface Water |
| WHITE OAK BEND MUD | TX1011238 | 2,520 | Groundwater |
| CINCO MUD 3 | TX0790292 | 2,517 | Purchased Groundwater |
| CASTLEWOOD MUD | TX1011833 | 2,505 | Groundwater |
| MONTGOMERY COUNTY MUD 111 | TX1700883 | 2,502 | Purchased Groundwater |
| CHAMBERS COUNTY MUD 1 | TX0360104 | 2,500 | Purchased Surface Water |
| NORTHWEST HARRIS COUNTY MUD 21 | TX1011744 | 2,493 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 127 | TX1700860 | 2,478 | Purchased Groundwater |
| CINCO MUD 5 | TX0790291 | 2,460 | Purchased Groundwater |
| CITY OF SOUTHSIDE PLACE | TX1010023 | 2,457 | Purchased Surface Water |
| FORT BEND COUNTY MUD 24 | TX0790468 | 2,454 | Purchased Groundwater |
| BEECHNUT MUD | TX1012082 | 2,451 | Groundwater |
| INVERNESS FOREST IMPROVEMENT DISTRICT | TX1010172 | 2,448 | Groundwater |
| SPRING CREEK FOREST PUD | TX1010390 | 2,427 | Purchased Surface Water |
| HARRIS COUNTY MUD 341 | TX1012917 | 2,421 | Purchased Surface Water |
| HARRIS COUNTY MUD 531 | TX1013531 | 2,421 | Groundwater |
| FORT BEND COUNTY MUD 218 | TX0790582 | 2,412 | Purchased Surface Water |
| ROLLING FORK PUD | TX1010357 | 2,391 | Purchased Surface Water |
| WEST HARRIS COUNTY MUD 5 | TX1013356 | 2,370 | Groundwater |
| HARRIS MONTGOMERY COUNTIES MUD 386 MAY V | TX1700796 | 2,364 | Purchased Surface Water |
| HARRIS COUNTY WCID 99 | TX1010684 | 2,343 | Groundwater |
| MONTGOMERY COUNTY MUD 96 | TX1700847 | 2,334 | Groundwater |
| SHASLA PUD | TX1010388 | 2,310 | Groundwater |
| HARRIS COUNTY MUD 422 | TX1013632 | 2,307 | Purchased Surface Water |
| HARRIS COUNTY MUD 44 | TX1010718 | 2,301 | Groundwater |
| KIRKMONT MUD | TX1010439 | 2,289 | Purchased Surface Water |
| CINCO MUD 12 | TX0790344 | 2,274 | Purchased Groundwater |
| NORTHWEST HARRIS COUNTY MUD 6 | TX1011008 | 2,256 | Purchased Surface Water |
| EAST MONTGOMERY COUNTY MUD 3 | TX1700705 | 2,250 | Groundwater |
| FORT BEND COUNTY MUD 46 | TX0790315 | 2,247 | Purchased Surface Water |
| FORT BEND COUNTY MUD 158 | TX0790466 | 2,214 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 83 | TX1700581 | 2,208 | Groundwater |
| HARRIS COUNTY MUD 156 | TX1013327 | 2,082 | Purchased Surface Water |
| GRAND LAKES MUD 2 | TX0790387 | 2,076 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 164 | TX1700894 | 2,076 | Groundwater |
| LAKE CONROE HILLS MUD | TX1700140 | 2,058 | Groundwater |
| AUDUBON MUD 1 | TX1700906 | 2,049 | Groundwater |
| PALMER PLANTATION MUD 1 | TX0790199 | 2,031 | Groundwater |
| HARRIS COUNTY MUD 61 | TX1010721 | 2,016 | Groundwater |
| GRAND OAKS MUD | TX1700757 | 2,013 | Purchased Groundwater |
| BRAZORIA COUNTY MUD 40 | TX0200754 | 1,986 | Groundwater |
| SEDONA LAKES MUD 1 | TX0200663 | 1,977 | Groundwater |
| DENTON COUNTY FWSD 11-C | TX0610272 | 1,977 | Purchased Surface Water |
| BRAZORIA COUNTY MUD 32 | TX0200749 | 1,971 | Purchased Groundwater |
| HARRIS COUNTY FWSD 58 | TX1010209 | 1,968 | Groundwater |
| HARRIS COUNTY MUD 530 | TX1013530 | 1,959 | Groundwater |
| MONTGOMERY COUNTY MUD 24 | TX1700269 | 1,956 | Groundwater |
| HARRIS COUNTY MUD 494 | TX1013511 | 1,944 | Purchased Groundwater |
| HARRIS COUNTY MUD 420 | TX1013399 | 1,941 | Purchased Surface Water |
| MEMORIAL HILLS UTILITY DISTRICT | TX1010279 | 1,929 | Groundwater |
| HARRIS COUNTY MUD 213-A | TX1013695 | 1,926 | Purchased Surface Water |
| FORT BEND COUNTY MUD 184 | TX0790559 | 1,884 | Purchased Surface Water |
| NORTHEAST HARRIS COUNTY MUD 1 EDGEWOOD V | TX1013449 | 1,842 | Purchased Surface Water |
| FORT BEND COUNTY MUD 206 VICTORIAN GARDE | TX0790548 | 1,836 | Purchased Surface Water |
| ELLIS COUNTY FWSD 1 | TX0700081 | 1,812 | Purchased Surface Water |
| FORT BEND COUNTY MUD 220 | TX0790573 | 1,812 | Groundwater |
| LONGHORN TOWN UTILITY DISTRICT | TX1012408 | 1,788 | Groundwater |
| NORTHEAST HARRIS COUNTY MUD 1 SHELDON RI | TX1013448 | 1,788 | Purchased Groundwater |
| HARRIS COUNTY MUD 220 | TX1013321 | 1,773 | Purchased Surface Water |
| FORT BEND COUNTY MUD 156 | TX0790541 | 1,719 | Purchased Groundwater |
| GENERATION PARK MANAGEMENT DISTRICT | TX1013387 | 1,687 | Purchased Surface Water |
| HARRIS COUNTY MUD 552 | TX1013843 | 1,683 | Purchased Surface Water |
| WILLOW POINT MUD | TX0790550 | 1,668 | Groundwater |
| FORT BEND COUNTY MUD 37 | TX0790189 | 1,662 | Groundwater |
| NORTHWEST HARRIS COUNTY MUD 28 | TX1013258 | 1,605 | Purchased Surface Water |
| FAR HILLS UTILITY DISTRICT | TX1700011 | 1,596 | Groundwater |
| WEST HARRIS COUNTY MUD 1 | TX1010925 | 1,581 | Purchased Groundwater |
| WEST HARRIS COUNTY MUD 4 | TX1011825 | 1,581 | Groundwater |
| SOUTHWEST HARRIS COUNTY MUD 1 | TX1011911 | 1,581 | Purchased Surface Water |
| HARRIS COUNTY MUD 205 | TX1012704 | 1,560 | Purchased Groundwater |
| NORTH FOREST MUD | TX1010298 | 1,545 | Groundwater |
| EAST MONTGOMERY COUNTY MUD 4 | TX1700741 | 1,500 | Groundwater |
| FORT BEND COUNTY MUD 19 | TX0790155 | 1,497 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 145 | TX1700930 | 1,476 | Purchased Groundwater |
| HARRIS COUNTY MUD 559 | TX1013762 | 1,470 | Groundwater |
| HARRIS COUNTY MUD 36 | TX1012000 | 1,464 | Groundwater |
| HARRIS COUNTY MUD 261 | TX1012866 | 1,452 | Purchased Surface Water |
| MONTGOMERY COUNTY MUD 166 | TX1700903 | 1,443 | Purchased Surface Water |
| HARRIS COUNTY MUD 275 | TX1012496 | 1,428 | Groundwater |
| HARRIS COUNTY MUD 537 | TX1013586 | 1,416 | Purchased Surface Water |
| LOUETTA ROAD UTILITY DISTRICT | TX1010536 | 1,410 | Purchased Surface Water |
| WOODRIDGE MUD | TX1700859 | 1,407 | Purchased Groundwater |
| WALLER COUNTY ROAD IMPROVEMENT DIST 1 | TX2370094 | 1,400 | Groundwater |
| MONTGOMERY COUNTY MUD 152A | TX1701014 | 1,344 | Purchased Groundwater |
| HARRIS COUNTY MUD 490 | TX1013721 | 1,293 | Purchased Surface Water |
| PINEHURST DECKER PRAIRIE WSC | TX1700507 | 1,287 | Groundwater |
| MEMORIAL POINT UTILITIES DISTRICT | TX1870030 | 1,285 | Groundwater |
| HARRIS COUNTY MUD 421 | TX1013376 | 1,269 | Purchased Surface Water |
| HARRIS COUNTY MUD 551 | TX1013688 | 1,269 | Purchased Surface Water |
| FORT BEND COUNTY MUD 145 RIO VISTA | TX0790502 | 1,263 | Purchased Groundwater |
| HARRIS COUNTY WCID 113 ENCHANTED VILLAGE | TX1010274 | 1,233 | Groundwater |
| CHARLESTON MUD | TX0790588 | 1,212 | Groundwater |
| MONTGOMERY COUNTY MUD 199 | TX1700940 | 1,203 | Groundwater |
| HARRIS COUNTY MUD 255 | TX1012766 | 1,185 | Purchased Surface Water |
| HARRIS COUNTY MUD 122 | TX1012391 | 1,158 | Purchased Surface Water |
| HARRIS COUNTY MUD 500 | TX1013390 | 1,158 | Purchased Surface Water |
| HARRIS COUNTY WCID 156 | TX1013147 | 1,116 | Purchased Surface Water |
| HARRIS COUNTY MUD 570C | TX1013800 | 1,113 | Purchased Groundwater |
| CITY OF HOUSTON DISTRICT 82 | TX1011593 | 1,104 | Groundwater |
| ROYALWOOD MUD | TX1010201 | 1,101 | Groundwater |
| CORINTHIAN POINT MUD 2 | TX1700152 | 1,086 | Groundwater |
| LUCE BAYOU PUD | TX1010378 | 1,083 | Groundwater |
| FORT BEND COUNTY MUD 49 | TX0790256 | 1,080 | Purchased Groundwater |
| HARRIS COUNTY MUD 547 | TX1013827 | 1,074 | Purchased Groundwater |
| HARRIS COUNTY MUD 136 | TX1010599 | 1,062 | Purchased Surface Water |
| BAKER ROAD MUD | TX1012962 | 1,062 | Purchased Groundwater |
| SEQUOIA IMPROVEMENT DISTRICT | TX1010205 | 1,038 | Groundwater |
| HARRIS COUNTY MUD 465 | TX1013674 | 1,026 | Groundwater |
| MONTGOMERY COUNTY MUD 141 | TX1700866 | 978 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 56 | TX1700489 | 972 | Groundwater |
| CITY OF HILSHIRE VILLAGE | TX1012987 | 945 | Purchased Surface Water |
| TEXAS NATIONAL MUD | TX1700207 | 931 | Groundwater |
| HARRIS COUNTY MUD 250 | TX1012350 | 930 | Purchased Surface Water |
| FIVE OAKS MOBILE HOME SUBDIVISION | TX1011832 | 915 | Groundwater |
| CYPRESSWOOD SUBDIVISION WATER SYSTEM | TX1700918 | 900 | Groundwater |
| HARRIS COUNTY MUD 321 | TX1012913 | 882 | Purchased Surface Water |
| HARRIS COUNTY MUD 286 | TX1012532 | 879 | Purchased Surface Water |
| HARRIS COUNTY MUD 539 | TX1013784 | 870 | Groundwater |
| MOUNT HOUSTON SQUARE | TX1011957 | 836 | Groundwater |
| WEST HARRIS COUNTY MUD 15 | TX1012001 | 834 | Purchased Surface Water |
| HARRIS COUNTY MUD 576 | TX1013742 | 822 | Purchased Groundwater |
| HARRIS COUNTY MUD 503 | TX1013768 | 819 | Purchased Groundwater |
| BIG SKY MUD | TX0610278 | 813 | Groundwater |
| SEVEN HILLS RANCH | TX0460243 | 801 | Ground Water Under Influence |
| FORT BEND COUNTY MUD 132 | TX0790566 | 795 | Purchased Surface Water |
| NORTHWOOD MUD 1 | TX1013404 | 795 | Groundwater |
| FORT BEND COUNTY MUD 192 | TX0790553 | 758 | Purchased Groundwater |
| CLOVERCREEK MUD | TX1700589 | 738 | Groundwater |
| HARRIS COUNTY IMPROVEMENT DISTRICT 14 | TX1013757 | 717 | Purchased Groundwater |
| BRAZORIA COUNTY MUD 24 | TX0200775 | 708 | Purchased Groundwater |
| SUNBELT FWSD OAKGLEN SUBDIVISION | TX1010188 | 684 | Groundwater |
| FORT BEND COUNTY MUD 198 | TX0790601 | 675 | Groundwater |
| LAZY RIVER IMPROVEMENT DISTRICT | TX1700039 | 672 | Groundwater |
| SPORTSMANS WORLD MUD | TX1820050 | 672 | Surface Water |
| FORT BEND COUNTY MUD 134F | TX0790651 | 661 | Purchased Groundwater |
| GALVESTON COUNTY WCID 19 | TX0840028 | 660 | Groundwater |
| HARRIS COUNTY MUD 405 | TX1013362 | 657 | Groundwater |
| FORT BEND COUNTY WCID 3 | TX0790368 | 648 | Groundwater |
| BRAZORIA COUNTY MUD 44 | TX0200774 | 630 | Purchased Groundwater |
| WHITE OAK MANOR MOBILE HOME PARK | TX1010322 | 630 | Groundwater |
| WEST HOUSTON MOBILE HOME COMMUNITY | TX1010583 | 630 | Groundwater |
| MONTGOMERY COUNTY MUD 42 | TX1700320 | 630 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 16 WHITE OAK PLANT | TX1700164 | 627 | Groundwater |
| FORT BEND COUNTY MUD 189 | TX0790497 | 624 | Groundwater |
| HUNTER PLACE | TX1013191 | 606 | Groundwater |
| HOOKS MOBILE HOME PARK | TX1011713 | 585 | Groundwater |
| ROYAL COACH MOBILE HOME VILLAGE | TX1010520 | 582 | Groundwater |
| RICHEY ROAD MUD | TX1011929 | 579 | Groundwater |
| WILDWOOD MOBILE HOME VILLAGE | TX1520046 | 577 | Groundwater |
| FORT BEND COUNTY MUD 250A | TX0790648 | 576 | Purchased Groundwater |
| HARRIS COUNTY MUD 578 | TX1013764 | 576 | Purchased Surface Water |
| HARRIS COUNTY MUD 569 | TX1013806 | 549 | Purchased Groundwater |
| OAK MANOR MUD | TX0200032 | 537 | Groundwater |
| HARRIS COUNTY MUD 540 | TX1013706 | 519 | Purchased Groundwater |
| CINCO SOUTHWEST MUD 1 | TX0790438 | 513 | Purchased Surface Water |
| HARRIS COUNTY FWSD 45 | TX1010545 | 504 | Groundwater |
| ORANGE GROVE WATER SUPPLY | TX1010870 | 498 | Groundwater |
| FORT BEND COUNTY MUD 66 | TX0790486 | 495 | Purchased Surface Water |
| HORSESHOE BEND | TX0790144 | 492 | Groundwater |
| HARRIS COUNTY MUD 48 | TX1010896 | 483 | Purchased Groundwater |
| BURLESON COUNTY MUD 1 | TX0260005 | 480 | Groundwater |
| LAMAR IMPROVEMENT DISTRICT | TX0040059 | 450 | Purchased Groundwater |
| PRESERVE AT HIGHWAY 6 | TX0790628 | 450 | Groundwater |
| KINGMONT MOBILE HOME PARK | TX1012892 | 420 | Groundwater |
| AIRPORT ROAD MUD | TX1700975 | 411 | Purchased Groundwater |
| HARRIS COUNTY MUD 211 | TX1012145 | 405 | Purchased Groundwater |
| CYPRESS FOREST WATER SYSTEM | TX1010120 | 396 | Groundwater |
| HARRIS COUNTY MUD 233 | TX1012498 | 390 | Purchased Surface Water |
| BRAZORIA COUNTY MUD 87 | TX0200804 | 387 | Groundwater |
| FORT BEND COUNTY MUD 255 | TX0790647 | 387 | Purchased Surface Water |
| RALSTON ACRES WATER SUPPLY CORPORATION | TX1010196 | 385 | Groundwater |
| CITY OF HOUSTON BELLEAU WOODS | TX1011594 | 381 | Purchased Surface Water |
| PROVENCE WATER SYSTEM | TX1013036 | 366 | Groundwater |
| SPANISH COVE PUD | TX1010389 | 357 | Groundwater |
| GREENLAND SQUARE SUBDIVISION WS | TX1013055 | 357 | Groundwater |
| PIN OAK MOBILE HOME PARK | TX1010826 | 345 | Groundwater |
| BLAKETREE MUD 1 | TX1700784 | 336 | Groundwater |
| BENDER CREEK APARTMENTS | TX1010180 | 330 | Groundwater |
| MONTGOMERY COUNTY MUD 211 | TX1700977 | 330 | Purchased Groundwater |
| ADVANCED RV PARK | TX1013374 | 327 | Purchased Surface Water |
| WESTMONT MOBILE HOME COMMUNITY | TX1700490 | 309 | Groundwater |
| SAVANNAH PLANTATION SUBDIVISION | TX0200599 | 300 | Groundwater |
| BAYOU FOREST VILLAGE MOBILE HOME PARK | TX1011995 | 297 | Groundwater |
| LAGO BELLO MUD 1A | TX1013763 | 297 | Groundwater |
| LAKE HOUSTON STORAGE | TX1010737 | 294 | Groundwater |
| KIRBY LANDING COMMUNITY | TX1013835 | 285 | Purchased Groundwater |
| SUNDOWN MOBILE HOME PARK | TX1010533 | 282 | Groundwater |
| NEW PROGRESS WATER SPRING VALLEY | TX1840089 | 282 | Groundwater |
| HARRIS COUNTY MUD 477 | TX1013670 | 267 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 172 | TX1700929 | 264 | Groundwater |
| BRAZORIA COUNTY MUD 57 MCCOY PARKWAY | TX0200680 | 255 | Purchased Groundwater |
| HARRIS COUNTY MUD 493 | TX1013790 | 255 | Purchased Surface Water |
| MANVEL ROAD TERRACE SUBDIVISION | TX0200102 | 240 | Groundwater |
| HARRIS COUNTY MUD 525 | TX1013579 | 237 | Groundwater |
| RIVER OAKS SUBDIVISION | TX0360090 | 234 | Groundwater |
| CHAMBERS COUNTY MUD 3 | TX0360150 | 234 | Purchased Surface Water |
| TIDWELL FOREST NEW SUBDIVISION | TX1013247 | 225 | Groundwater |
| RIVER RANCH MUD 3 | TX1460191 | 225 | Purchased Groundwater |
| HARRIS COUNTY MUD 358 | TX1012969 | 222 | Groundwater |
| MONTGOMERY COUNTY MUD 158 | TX1700962 | 219 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 180 | TX1700925 | 216 | Groundwater |
| EAST MONTGOMERY COUNTY MUD 14 | TX1700939 | 213 | Groundwater |
| KING RANCH SANTA GERTRUDIS DISTRICT | TX1370012 | 212 | Groundwater |
| CARBY MOBILE HOME PARK | TX1011632 | 210 | Groundwater |
| WALLER COUNTY MUD 37 | TX2370146 | 207 | Purchased Groundwater |
| MONTGOMERY COUNTY MUD 185 | TX1700934 | 195 | Groundwater |
| LINCOLN SQUARE SUBDIVISION PWS | TX1013111 | 189 | Groundwater |
| DERBY ING | TX0820016 | 174 | Groundwater |
| CITY OF KEMAH MMD 1 | TX0840287 | 171 | Purchased Surface Water |
| SUGAR PINES MHP | TX1810103 | 170 | Groundwater |
| RIO VILLA WSC | TX1011071 | 165 | Groundwater |
| SOUTH MIDLAND COUNTY WATER SYSTEM | TX1650077 | 165 | Groundwater |
| MONTGOMERY COUNTY MUD 197 | TX1700935 | 165 | Purchased Groundwater |
| ALDINE OAKS MHP | TX1010658 | 150 | Groundwater |
| TEJAS TRAILS SUBDIVISION | TX0790593 | 147 | Groundwater |
| TIMBER RIDGE SECTION 2 | TX0360117 | 141 | Groundwater |
| ALBURY MANOR UTILITY COMPANY | TX1012052 | 141 | Purchased Groundwater |
| ROVING MEADOWS WATER SYSTEM | TX1012260 | 141 | Groundwater |
| HARRIS COUNTY MUD 534 | TX1013716 | 141 | Purchased Groundwater |
| WALLER COUNTY MUD 34C | TX2370134 | 141 | Groundwater |
| CHANNEL OAKS WATER SYSTEM | TX0270037 | 135 | Groundwater |
| FORT BEND COUNTY MUD 216 | TX0790624 | 133 | Purchased Groundwater |
| FORT BEND COUNTY WCID 8 | TX0790479 | 126 | Groundwater |
| SWEA GARDENS ESTATES | TX1010218 | 126 | Purchased Surface Water |
| DEER TRAIL MOBILE HOME PARK | TX1010686 | 126 | Groundwater |
| ALDINE GARDENS MOBILE HOME PARK | TX1010825 | 126 | Groundwater |
| HARRIS COUNTY MUD 538 | TX1013640 | 126 | Purchased Groundwater |
| HARRIS COUNTY LEADERSHIP ACADEMY | TX1013205 | 125 | Groundwater |
| SUBURBAN MOBILE HOME PARK 2 | TX1010760 | 120 | Groundwater |
| MCFARLAND VILLAGE APARTMENTS | TX1012982 | 120 | Groundwater |
| LAZY LANE MOBILE HOME PARK | TX1700344 | 120 | Groundwater |
| HARRIS-WALLER COUNTIES MUD 4 | TX2370137 | 114 | Purchased Groundwater |
| GATEWAY DEVELOPMENT | TX1050121 | 108 | Groundwater |
| JOHNSONS WATER SERVICE | TX0200158 | 105 | Groundwater |
| FORT BEND COUNTY MUD 134D | TX0790562 | 105 | Purchased Surface Water |
| COUNTRY LIVING APARTMENTS | TX1011501 | 105 | Groundwater |
| LEANING OAK MOBILE HOME PARK | TX2370044 | 105 | Groundwater |
| RENES WATER SYSTEM | TX1010578 | 100 | Groundwater |
| REED ESTATES WATER SYSTEM | TX1010945 | 96 | Groundwater |
| CYPRESSWOOD MHP | TX1011112 | 96 | Groundwater |
| BLUEBONNET MOBILE HOME PARK | TX1010691 | 93 | Groundwater |
| PADOK TIMBERS SUBDIVISION WS | TX1012130 | 92 | Groundwater |
| HIGHLAND MEADOWS MOBILE HOME PARK | TX1010914 | 87 | Groundwater |
| ZAM ZAM WATER SUPPLY | TX1011747 | 87 | Groundwater |
| FAIRWAY MOBILE HOME VILLAGE | TX1010795 | 84 | Groundwater |
| FAIRVIEW MOBILE HOME COMMUNITY | TX1011268 | 84 | Groundwater |
| BOULAIS MOBILE HOME PARK | TX1012741 | 84 | Groundwater |
| CLEVELAND MH AND RV PARK | TX1460043 | 84 | Groundwater |
| OAK HILL ACRES MOBILE HOME SUBDIVISION | TX0150156 | 81 | Groundwater |
| CYPRESS GARDENS MOBILE HOME SUBDIVISION | TX1012048 | 81 | Groundwater |
| BALABAN APARTMENTS 1 | TX1010689 | 80 | Groundwater |
| OAK ACRES MOBILE HOME PARK | TX1810179 | 80 | Groundwater |
| SUNSET MOBILE HOME PARK 2 | TX1011972 | 78 | Groundwater |
| RIVERTON RANCH | TX1013366 | 78 | Groundwater |
| NOBLE ESTATES MHP | OK2001431 | 75 | Groundwater |
| LA CASITA HOMES II | TX1010648 | 75 | Groundwater |
| LONE WILLOW MHP WEST | TX1010663 | 75 | Groundwater |
| FAIRVIEW GARDENS MHP | TX1010821 | 75 | Groundwater |
| ARENOSA CREEK ESTATES | TX2350042 | 75 | Groundwater |
| WESTFIELD MEADOWS | TX1010584 | 72 | Groundwater |
| TALLOWS MOBILE HOME PARK | TX1010863 | 72 | Groundwater |
| COUNTRY LIVING MOBILE HOME PARK | TX1011638 | 72 | Groundwater |
| HARRIS COUNTY MUD 25 BROOK HOLLOW WEST S | TX1010422 | 69 | Purchased Surface Water |
| SATSUMA PARK VILLA MOBILE HOME PARK | TX1010763 | 66 | Groundwater |
| WHITEWING SUBDIVISION | TX1460061 | 64 | Groundwater |
| PEEK ROAD MOBILE HOME PARK | TX1012861 | 63 | Groundwater |
| HAVENSHIRE WATER SYSTEM | TX1700588 | 63 | Groundwater |
| RILEY ROAD ESTATES WS | TX2370071 | 63 | Groundwater |
| GRANGER SUBDIVISION | TX1013325 | 60 | Groundwater |
| FALL BRANCH ESTATES | TX1330178 | 60 | Groundwater |
| KING RANCH LAURELES DIVISION | TX1370028 | 60 | Groundwater |
| MONTGOMERY COUNTY MUD 144 | TX1700908 | 60 | Groundwater |
| WILLOW RIVER FARMS | TX2370061 | 60 | Groundwater |
| CHAMPION LAKES ESTATES WATER PLANT | TX1013146 | 58 | Groundwater |
| FORT BEND COUNTY MUD 188 | TX0790614 | 54 | Purchased Groundwater |
| K LAKE TERRACE | TX1012710 | 54 | Groundwater |
| HARRIS COUNTY MUD 560 | TX1013765 | 54 | Groundwater |
| ESTATES WATER CORP | TX1010675 | 51 | Groundwater |
| BALABAN APARTMENTS 2 | TX1011028 | 50 | Groundwater |
| BEAVER CREEK WCID 1 | TX0260052 | 45 | Groundwater |
| FORT BEND COUNTY MUD 246 | TX0790609 | 45 | Groundwater |
| NORTHWOODS MOBILE HOME PARK | TX1011956 | 45 | Groundwater |
| SUNSET MOBILE HOME PARK 1 | TX1011984 | 45 | Groundwater |
| HARRIS COUNTY MUD 565 | TX1013663 | 45 | Groundwater |
| LUCKY HOMES RV PARK | TX1013861 | 45 | Groundwater |
| KENDALL COUNTY WCID 3A | TX1300082 | 45 | Purchased Surface Water |
| AUDUBON MUD 2 | TX1700969 | 45 | Purchased Groundwater |
| TEPATITLAN MOBILE HOME PARK | TX1010667 | 42 | Groundwater |
| K ESTATES WATER SYSTEM | TX1012868 | 40 | Groundwater |
| SOLAR VILLAGE HOA | TX1330177 | 40 | Groundwater |
| PINE KNOB SUBDIVISION | TX1700652 | 39 | Groundwater |
| KING RANCH NORIAS | TX1310003 | 34 | Groundwater |
| QUALITY MOBILE HOME PARK | TX0840288 | 30 | Groundwater |
| WALLER COUNTY MUD 19 | TX2370128 | 27 | Groundwater |
| MEADOWS AT CYPRESS CREEK WATER PLANT | TX1013567 | 25 | Groundwater |
| HARRIS COUNTY MUD 491 | TX1013727 | 25 | Purchased Groundwater |
| EAST HOUSTON AT PINEY WOODS MHP | TX1013785 | 25 | Groundwater |
| FORT BEND COUNTY MUD 134A | TX0790477 | — | Purchased Surface Water |
| NORTH FORT BEND WATER AUTHORITY | TX0790511 | — | Purchased Surface Water |
| FORT BEND COUNTY MUD 250 | TX0790621 | — | Groundwater |
| NORTH CHANNEL WATER AUTHORITY | TX1013092 | — | Purchased Surface Water |
| NORTH HARRIS COUNTY REGIONAL WATER AUTHO | TX1013298 | — | Purchased Surface Water |
| WEST HARRIS COUNTY REGIONAL WATER AUTHOR | TX1013303 | — | Purchased Surface Water |
| HARRIS COUNTY MUD 418 | TX1013329 | — | Purchased Surface Water |
| HARRIS COUNTY MUD 387 | TX1013360 | — | Groundwater |
| CENTRAL HARRIS COUNTY REGIONAL WATER AUT | TX1013429 | — | Purchased Surface Water |
| HARRIS COUNTY MUD 171 | TX1013540 | — | Groundwater |
| HARRIS COUNTY IMPROVEMENT DISTRICT 13 | TX1013611 | — | Groundwater |
| HARRIS COUNTY MUD 570D | TX1013839 | — | Groundwater |
| HARRIS COUNTY MUD 478 WATER PLANT 1 | TX1013866 | — | Groundwater |
| RIVER RANCH MUD 1 | TX1460189 | — | Groundwater |
| EAST MONTGOMERY COUNTY MUD 5 | TX1700829 | — | Groundwater |
| MONTGOMERY COUNTY MUD 157 | TX1700937 | — | Groundwater |
| MONTGOMERY COUNTY MUD 152C | TX1701015 | — | Groundwater |
| MUNICIPAL GROUNDWATER SOLUTIONS | TX2270369 | — | Groundwater |
Water bodies near Houston
Buffalo Bayou At Houston · stream Whiteoak Bayou At Alabonson Rd, Houston · river Cole Ck At Deihl Rd, Houston · river Brickhouse Gully At Costa Rica St, Houston · river Whiteoak Bayou At Houston · river
As a surface-water system, these water bodies may directly influence Houston's drinking water supply.
05Pressure on Houston's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Industrial discharge
5 facilities within 10 miles reported 1,981k lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
VALERO REFINING - TEXAS L.P. HOUSTON REFINERY — nitrate compounds (water dissociable; reportable only when in aqueous solution) 1,963k lb · 9.3 mi
TPC GROUP LLC — methanol 15k lb · 9.9 mi
THE GOODYEAR TIRE & RUBBER CO — styrene 2k lb · 9.6 mi
+ 2 more facilities
Flood & storm history
10 federal disaster declarations on record for Harris County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
HURRICANE BERYL Jul 2024 · DR-4798
HURRICANE BERYL Jul 2024 · DR-4798
HURRICANE BERYL Jul 2024 · DR-4798
Superfund proximity
4 National Priorities List sites within 10 miles. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
06How Houston compares
Scores for nearby Texas cities on one line, with the average marked.
Houston (this city)
27.8 · F
dashed line = Texas average (47/100)
Houston scores 27.8/100 — below the Texas average of 47/100. Full Texas rankings →
FSan Antonio, TX
33.1 / 100FAustin, TX
31.2 / 100FDallas, TX
36.2 / 100FFort Worth, TX
34.5 / 100FEl Paso, TX
35.8 / 100DArlington, TX
50.5 / 100
Harris water quality rankings33.1 / 100FAustin, TX
31.2 / 100FDallas, TX
36.2 / 100FFort Worth, TX
34.5 / 100FEl Paso, TX
35.8 / 100DArlington, TX
50.5 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Houston's water — not generic advice.
Because of pfas
Filter drinking & cooking water
Reverse osmosis system. PFAS compounds exceed EPA maximum contaminant levels
Compare tested filters → Know your report
Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR → Stay informed
Watch for Houston alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →FAQ
Frequently asked questions
Is Houston, TX tap water safe to drink?
Houston's water quality earned a grade of F (27.8/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #1065 out of 1067 cities tested in Texas.
What contaminants are in Houston's water?
Lead was measured at 0.0 ppb (90th percentile). 10 PFAS compounds were detected. 11018 violations are on record.
How is Houston's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Houston?
PFAS compounds exceed EPA limits — a reverse osmosis or activated carbon filter is recommended.
Where does Houston's water come from?
Houston's water is sourced from Surface water. The city has 719 water systems serving approximately 5,913,076 residents.
What health violations has Houston's water system had?
Houston has 929 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3572 violations remain unresolved.
Why does Houston have so many PFAS compounds in its water?
10 different PFAS "forever chemical" compounds were detected in Houston's water supply during UCMR 5 testing. PFAS contamination often originates from proximity to military installations (AFFF firefighting foam), airports, industrial manufacturing sites, or wastewater treatment facilities. Some levels exceed the 2024 EPA maximum contaminant levels — a reverse osmosis or NSF-certified activated carbon filter is strongly recommended.
How does Houston's water compare to other cities?
Houston ranks #1065 out of 1067 cities in Texas (better than 0% of state cities) and #15367 out of 15382 cities nationally (0th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Copper Contaminant Profile EPA action levels, health effects, and copper removal options. Read the guide → PFAS Contaminant Profile Detailed profile on PFAS contamination in US water systems. Read the guide → PFAS Forever Chemicals Explained Learn what PFAS are, how they get into water, and what filtration removes them. Read the guide →