01The verdict: is Boise water safe?
Boise's drinking water has significant quality concerns based on EPA testing data. With a grade of F (33.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 40 water systems serve approximately 285,925 residents using surface water (rivers, lakes, or reservoirs).
Copper is over its legal limit
Measured at 1.60 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 ↓Lead is well under the limit
90th-percentile lead is 4.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓lithium is approaching its limit
Measured at 24.3000 µg/L — 120% of the 0.004 µg/L limit. Within the rules, but with less headroom than you'd want.
See the ledger ↓Boise's drinking water received a grade of F (33.6 out of 100), indicating failing water quality. The city's 40 water systems serve approximately 285,925 residents using surface water.
Lead levels were measured at 4.0 ppb (90th percentile), well within EPA limits. UCMR 5 testing detected 8 PFAS compounds, with levels exceeding EPA maximum contaminant levels in the water supply. The system has 2299 violations on record, including 218 health-based violations. 170 remain unresolved.
Boise ranks #139 out of 139 cities in Idaho 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 2.40 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. The system has seen 467 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Boise's water
Every contaminant flagged in Boise, 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.
Over Limit — EPA Action Level: 1.3 mg/L
Exceeds the EPA action level. Copper leaches from household plumbing — flush taps for 30 seconds before drinking, and consider a certified filter.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. | 4.0 | 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. | 1.60 | 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. | 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. | 24.300 | 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. | 0.004 | 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. | 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. | 0.005 | 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. | 0.051 | HI | µg/L | PFAS | 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. | 0.006 | 0.004 | µg/L | PFAS | Over MCL |
| 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. | 0.005 | 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 |
Cities ranked by 90th-percentile lead PF PFAS in Idaho
Cities ranked by compounds detected Cu Copper in Idaho
Cities ranked by 90th-percentile copper
03Boise'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 2299 violations on record, including 218 health-based violations. 170 remain unresolved.
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.
▼ Down 2 ppb since 1992. Latest reading: 4 ppb (2026) — 27% of the action level. Sampled at higher-risk homes (90th percentile).
▼ Down 1.4 mg/L since 1993. The latest reading (1.6 mg/L, 2023) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Boise's water comes from
Boise's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
40 systems
40 water systems, operated under private ownership.
285,925 people
Residents served across Boise'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 private ownership and serves approximately 285,925 people through 40 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| VEOLIA WATER IDAHO | ID4010016 | 264,978 | Surface Water |
| CAPITOL WATER CORP | ID4010022 | 9,000 | Groundwater |
| IDOC SBX COMPLEX | ID4010141 | 3,309 | Groundwater |
| IDOC IDAHO STATE CORRECTIONAL CENTER | ID4010240 | 2,204 | Groundwater |
| HILLSDALE ESTATES HOMEOWNERS ASSN | ID4010218 | 800 | Groundwater |
| RUSTIC ACRES MOBILE HOME PARK | ID4010126 | 540 | Groundwater |
| WILDERNESS RANCH OWNERS ASSOCIATION INC | ID4080055 | 525 | Surface Water |
| IDOC MOUNTAIN VIEW TRANSFORMATION CENTER | ID4010255 | 456 | Groundwater |
| FLYING H TRAILER RANCH | ID4010062 | 430 | Groundwater |
| LAKEYS CAFE AND TRAILER PARK | ID3140061 | 300 | Groundwater |
| EAGLE GLEN HOMEOWNERS ASSN INC | ID4010047 | 300 | Groundwater |
| WYMOSA WATER ASSN INC | ID4010161 | 280 | Groundwater |
| PARADISE ESTATES WATER CORP | ID4010111 | 273 | Purchased Surface Water |
| WEST MEADOWS ESTATES | ID4010158 | 270 | Purchased Surface Water |
| CANYON CREEK MOBILE HOME PARK | ID4200010 | 243 | Groundwater |
| KLUGHERZ WATER CORP | ID4010083 | 200 | Groundwater |
| BLACKHAWK ON THE RIVER | ID4430105 | 150 | Groundwater |
| MORES CREEK RIM RANCH WATER DIST | ID4080029 | 140 | Surface Water |
| RIVERS POINT PROPERTY OWNERS ASSN | ID4080037 | 140 | Surface Water |
| EAGLE MHC | ID4010123 | 135 | Groundwater |
| LINDA VISTA MOBILE HOME PARK | ID4010088 | 125 | Groundwater |
| KRIZVIEW PARK | ID4010178 | 120 | Groundwater |
| OSPREY | ID4080101 | 100 | Groundwater |
| HAMPTON HOMES HOME OWNERS ASSN | ID4010071 | 95 | Groundwater |
| FRANKLIN DOMESTIC WATER USERS | ID4010064 | 75 | Groundwater |
| STANLEY POND INC | ID4010139 | 72 | Groundwater |
| ISLAND VILLAGE MOBILE HOME PARK | ID4010076 | 70 | Groundwater |
| MALAD AND HILTON WATER COMPANY INC. | ID4010092 | 70 | Groundwater |
| RANCH SUBD | ID4080036 | 65 | Groundwater |
| MOUNTAIN SAGE | ID4200073 | 65 | Groundwater |
| DANSKIN PROPERTIES ASSOCIATION INC | ID4200091 | 52 | Groundwater |
| CHRISTIS MOBILE PARK | ID3140142 | 50 | Groundwater |
| AMY TRAILER PARK | ID4010068 | 46 | Groundwater |
| MOUNTAIN VIEW ESTATES | ID1400088 | 43 | Groundwater |
| H AND L PARK | ID3140060 | 43 | Groundwater |
| ANDERSON CIRCLE WATER CORP | ID4010005 | 40 | Groundwater |
| BOISE HOLCOMB WATER USERS ASSOC. INC | ID4080004 | 36 | Groundwater |
| RIM ACRES MUTUAL WATER | ID4010122 | 31 | Groundwater |
| RILEY TRAILER PARK | ID4010121 | 30 | Groundwater |
| SKYVIEW MOBILE HOME PARK | OK2002601 | 24 | Groundwater |
Water bodies near Boise
As a surface-water system, these water bodies may directly influence Boise's drinking water supply.
05Pressure on Boise'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.
Flood & storm history
6 federal disaster declarations on record for Ada County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Drought
Shoshone County is in D2 (severe drought) per the U.S. Drought Monitor (week of Jul 2026). Drought can raise disinfection-byproduct levels and taste/odor issues as utilities draw from lower reservoirs.
06How Boise compares
Scores for nearby Idaho cities on one line, with the average marked.
dashed line = Idaho average (44/100)
Boise scores 33.6/100 — below the Idaho average of 44/100. Full Idaho rankings →
42.9 / 100FNampa, ID
41.8 / 100DIdaho Falls, ID
46.6 / 100FCaldwell, ID
38.5 / 100FPocatello, ID
42.5 / 100FCoeur D Alene, ID
44 / 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 Boise's water — not generic advice.
Filter drinking & cooking water
Reverse osmosis system. PFAS compounds exceed EPA maximum contaminant levels
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Boise 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 →Frequently asked questions
Is Boise, ID tap water safe to drink?
Boise's water quality earned a grade of F (33.6/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #139 out of 139 cities tested in Idaho.
What contaminants are in Boise's water?
Lead was measured at 4.0 ppb (90th percentile). 8 PFAS compounds were detected. 2299 violations are on record.
How is Boise'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 Boise?
PFAS compounds exceed EPA limits — a reverse osmosis or activated carbon filter is recommended.
Where does Boise's water come from?
Boise's water is sourced from Surface water. The city has 40 water systems serving approximately 285,925 residents.
What health violations has Boise's water system had?
Boise has 218 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. 170 violations remain unresolved.
Why does Boise have so many PFAS compounds in its water?
8 different PFAS "forever chemical" compounds were detected in Boise'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 Boise's water compare to other cities?
Boise ranks #139 out of 139 cities in Idaho (better than 0% of state cities) and #15243 out of 15382 cities nationally (1th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.