Is Washington, DC Tap Water Safe to Drink?
Graded F — but Chlorate was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
40.1/100
waterverge.com Washington, DC — Water Quality Report
Washington's drinking water received a grade of F (40.1 out of 100), indicating failing water quality. The city's 4 water systems serve approximately 667,325 residents using purchased surface water.
Lead levels were measured at 2.0 ppb (90th percentile), well within EPA limits. UCMR 5 testing detected 3 PFAS compounds in the water supply.
The system has 106 violations on record, including 32 health-based violations. 46 remain unresolved.
Latest water news in Washington
Recent reporting on Washington, DC drinking water — boil-water advisories, violations, and infrastructure events.
What to know about Washington's water
Washington ranks #6 out of 6 cities in District of Columbia 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.
PFAS compounds were detected in testing, though levels remain within current EPA limits. Residents seeking extra precaution may consider an activated carbon or reverse osmosis filter.
Haloacetic acid (HAA5) levels were elevated at 35.5 µg/L in UCMR 4 testing, though below the 60 µg/L EPA limit. Activated carbon filtration can help reduce these disinfection byproducts.
Hexavalent chromium (chromium-6) was detected at 0.12 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 667K residents, Washington faces large-scale infrastructure challenges including aging pipes and the complexity of treating water across a vast distribution network.
The system has seen 35 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Washington, DC water safe to drink?
Washington's drinking water has significant quality concerns based on EPA testing data. With a grade of F (40.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 667,325 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Washington
A timeline of significant water quality events, violations, and data updates.
Detected at levels within current EPA limits. PFAS persist indefinitely in the environment.
Latest EPA compliance and testing data incorporated into Washington's water quality assessment. Grade: F (40.1/100).
Contaminants: TTHM.
1 health-based. Contaminants: Public Notice, Surface Water Treatment Rule.
1 health-based. Contaminants: Consumer Confidence Rule, TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Washington's water supply.
Well within EPA limits.
Detected but within current EPA limits. PFAS do not break down in the environment and can accumulate in the body over time. An activated carbon filter can reduce exposure.
PFAS "forever chemicals" detected
UCMR 5 testing found 3 PFAS compounds in Washington's water supply. PFAS are synthetic chemicals that persist indefinitely in the environment and the human body.
Violation history
Washington's water system has 106 total violations on record, including 32 health-based violations. 46 remain unresolved. 35 violations were issued in the last 5 years.
Where does Washington's water come from?
Washington's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 4 water systems serving approximately 667,325 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Dead Run (river), Potomac River (river), Rock Creek (river), Luzon Branch Above Rock Creek At Washington (river), Paint Branch (river).
What Washington residents can do
Recommended: Activated carbon or reverse osmosis filter. This addresses the specific contaminants found in Washington's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Forever chemicals overview
National PFAS report →Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Washington
Industrial polluters nearby
Reported releases to surface water by facilities near Washington, ranked by pounds discharged annually.
Total reported releases to surface water: 2,413 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
FORT TOTTEN READY MIX CONCRETE WASHINGTON, DC20011 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 1,750 | 3.3 mi |
VIRGINIA CONCRETE SHIRLINGTON PLANT ARLINGTON, VA22206 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 327 | 5.5 mi |
VIRGINIA CONCRETE FALLS CHURCH PLANT FALLS CHURCH, VA22043 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 260 | 9.4 mi |
US ARMY CORPS OF ENGINEERS DALECARLIA WTP WASHINGTON, DC20016 | Ammonia | 76 | 5.6 mi |
US ARMY CORPS OF ENGINEERS MCMILLAN WTP WASHINGTON AQUEDUC WASHINGTON, DC20001 | — | — | 1.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Washington
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- WASHINGTON NAVY YARD2.6 mi
Source: EPA Superfund National Priorities List
Drought conditions
D2 — severe droughtDistrict of Columbia is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Recommended water filters
Based on contaminants detected in Washington's water supply, we recommend the following filter types.
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. | 2.0 | 15 | ppb | Inorganic | Safe |
| 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. | ND | HI | µg/L | PFAS | Not 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. | 12.000 | 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. | ND | HI | µg/L | PFAS | Not 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. | ND | HI | µg/L | PFAS | Not 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. | ND | HI | µg/L | PFAS | Not 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. | 0.005 | 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. | ND | HI | µg/L | PFAS | Not 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. | ND | 0.004 | µg/L | PFAS | Not 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. | ND | 0.004 | µg/L | PFAS | Not Detected |
| 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. | 0.006 | 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 |
Lead level trend (90th percentile)
See how Washington compares by contaminant
Explore where Washington ranks among all District of Columbia cities for specific contaminants.
Water source & infrastructure
Where Washington's water comes from
Washington's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
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 667,325 people through 4 water systems.
Water bodies near Washington
Washington is located near 5 notable water bodies. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Washington
| System Name | PWSID | Population | Source |
|---|---|---|---|
| D.C. WATER AND SEWER AUTHORITY | DC0000002 | 632,323 | SWP |
| JOINT BASE ANACOSTIA - BOLLING | DC0000004 | 19,312 | SWP |
| NAVAL STATION WASHINGTON - WNY | DC0000003 | 15,690 | SWP |
| WASHINGTON AQUEDUCT DIVISION. | DC0000001 | — | SW |
How Washington compares
Full District of Columbia rankings →Washington's score of 40.1/100 is below the average of 84/100 among major District of Columbia cities. 5 of 5 nearby cities score higher.
Nearby cities
View District of Columbia rankings →About Washington, DC
Wikipedia →Washington, D.C., officially the District of Columbia and commonly known as simply Washington or D.C., is the capital city and federal district of the United States. The city is on the Potomac River across from Virginia and shares land borders with Maryland to its north and east. It was named after George Washington, a Founding Father and the first president of the United States. The district is named for Columbia, the female personification of the nation, through which human form and attributes are applied to the United States.
Learn more about your water
Guides and resources related to Washington's water quality findings.
Explore water quality across District Of Columbia
Frequently asked questions
Is Washington, DC tap water safe to drink?
Washington's water quality earned a grade of F (40.1/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #6 out of 6 cities tested in District of Columbia.
What contaminants are in Washington's water?
Lead was measured at 2.0 ppb (90th percentile). 3 PFAS compounds were detected. 106 violations are on record.
How is Washington'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 Washington?
PFAS compounds have been detected. A filter with activated carbon can help reduce exposure.
Where does Washington's water come from?
Washington's water is sourced from Purchased surface water. The city has 4 water systems serving approximately 667,325 residents.
What health violations has Washington's water system had?
Washington has 32 health-based violations on record. The most recent violation was recorded in November 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 46 violations remain unresolved.
Why does Washington have so many PFAS compounds in its water?
3 different PFAS "forever chemical" compounds were detected in Washington'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. While detected, current levels are within EPA limits. An activated carbon filter can further reduce exposure.
How does Washington's water compare to other cities?
Washington ranks #6 out of 6 cities in District of Columbia (better than 0% of state cities) and #15170 out of 15744 cities nationally (4th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.