Tap Water Quality Report
Tap water quality in Auburn, Washington
Tap water in Auburn, Washington receives a grade of C (75/100) from TapWaterSafety.org. It's served by Auburn City of. The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Auburn's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Auburn.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.395 ppb, 99x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 6.83 ppb, 68x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 10.2 ppb, 68x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for Auburn City of (system ID WA5303350) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Nitrate Rule | Missed testing or reporting | 01/01/2025 | Resolved |
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 Auburn
Filters matched to the specific contaminants in Auburn's water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
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 Auburn'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 |
0.395 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 99× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
6.83 ppb | 0.1 | 60.0 | 60 | — | — | — | 68× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
10.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 68× over |
| Bromodichloromethane Disinfection byproduct |
2.65 ppb | 0.06 | — | — | — | — | — | 44× over |
| Dibromochloromethane Disinfection byproduct |
2.3 ppb | 0.1 | — | — | — | — | — | 23× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.65 ppb | 0.06 | — | — | — | — | — | 11× over |
| Chromium (hexavalent) Heavy metal |
0.201 ppb | 0.02 | — | — | — | — | — | 10× over |
| Nitrate Inorganic |
1.44 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 10× over |
| Nitrate and nitrite Inorganic |
1.4 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 10× over |
| Dibromoacetic acid Disinfection byproduct |
0.297 ppb | 0.03 | — | — | — | — | — | 9.9× over |
| Chloroform Disinfection byproduct |
3.53 ppb | 0.4 | — | — | — | — | — | 8.8× over |
| Dichloroacetic acid Disinfection byproduct |
1.76 ppb | 0.2 | — | — | — | — | — | 8.8× over |
| Trichloroacetic acid Disinfection byproduct |
0.217 ppb | 0.1 | — | — | — | — | — | 2.2× over |
| Bromoform Disinfection byproduct |
0.488 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
20.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
1.84 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
3.98 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.371 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0638 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Testosterone Other |
0.038 ppt | — | — | — | — | — | — | 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 Auburn City of.