Tap Water Quality Report
Tap water quality in Spokane, Washington
Tap water in Spokane, Washington receives a grade of F (58/100) from TapWaterSafety.org. It's served by SPOKANE CITY OF. The most significant water quality concerns are: PFAS contamination; Arsenic significantly above health guideline; Total PFOS and PFOA significantly above health guideline; Radon significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Spokane's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Spokane.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 3.19 ppb, 797x above the EWG health guideline of 0.004 ppb.
Total PFOS and PFOA significantly above health guideline
Moderate concernTotal PFOS and PFOA detected at 5.05 ppt, 722x above the EWG health guideline of 0.007 ppt.
Radon significantly above health guideline
Moderate concernRadon detected at 398.0 pCi/L, 265x above the EWG health guideline of 1.5 pCi/L.
EPA compliance record
Official U.S. EPA records for SPOKANE CITY OF (system ID WA5383100) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for Spokane
Filters matched to the specific contaminants in Spokane's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in Spokane's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
3.19 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 797× over |
| Total PFOS and PFOA PFAS |
5.05 ppt | 0.007 | — | 100 | 100 | 0.007 | — | 722× over |
| Radon Radiological |
398.0 pCi/L | 1.5 | — | — | — | — | — | 265× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
2.19 ppb | 0.15 | 80.0 | 100 | — | — | — | 15× over |
| Chromium (hexavalent) Heavy metal |
0.26 ppb | 0.02 | — | — | — | — | — | 13× over |
| Nitrate Inorganic |
1.72 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 12× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.557 ppb | 0.06 | — | — | — | — | — | 9.3× over |
| Nitrate and nitrite Inorganic |
1.23 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 8.8× over |
| Bromodichloromethane Disinfection byproduct |
0.469 ppb | 0.06 | — | — | — | — | — | 7.8× over |
| Dibromochloromethane Disinfection byproduct |
0.718 ppb | 0.1 | — | — | — | — | — | 7.2× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.407 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 4.5× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
1.33 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 4.4× over |
| Radium, combined (-226 and -228) Radiological |
0.16 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.3× over |
| Bromoform Disinfection byproduct |
0.355 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chloroform Disinfection byproduct |
0.227 ppb | 0.4 | — | — | — | — | — | Below guideline |
| Antimony Heavy metal |
0.473 ppb | 1.0 | 6.0 | 10 | 20 | 1 | — | Below guideline |
| Barium Heavy metal |
19.7 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
0.732 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.184 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
1.31 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.572 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.537 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.733 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.102 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.0142 ppb | — | — | — | — | — | — | Below guideline |
| PFOS + PFOA + PFHxS + PFNA PFAS |
5.05 ppt | — | — | 100 | 100 | 0.007 | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from SPOKANE CITY OF.