Tap Water Quality Report
Tap water quality in Pasco, Washington
Tap water in Pasco, Washington receives a grade of C (74/100) from TapWaterSafety.org. It's served by PASCO WATER DEPARTMENT. The most significant water quality concerns are: Haloacetic acids (HAA9) 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 Pasco's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Pasco.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 26.1 ppb, 435x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 21.3 ppb, 213x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 28.7 ppb, 191x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for PASCO WATER DEPARTMENT (system ID WA5366400) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Nitrate Rule | Missed testing or reporting | 01/01/2025 | Resolved |
| Synthetic Organic Chemicals | Missed testing or reporting | 01/01/2023 | 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 Pasco
Filters matched to the specific contaminants in Pasco's water supply.
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 Pasco'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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
26.1 ppb | 0.06 | — | — | — | — | — | 435× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
21.3 ppb | 0.1 | 60.0 | 60 | — | — | — | 213× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
28.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 191× over |
| Trichloroacetic acid Disinfection byproduct |
11.9 ppb | 0.1 | — | — | — | — | — | 119× over |
| Chloroform Disinfection byproduct |
25.8 ppb | 0.4 | — | — | — | — | — | 64× over |
| Bromodichloromethane Disinfection byproduct |
2.89 ppb | 0.06 | — | — | — | — | — | 48× over |
| Dichloroacetic acid Disinfection byproduct |
9.33 ppb | 0.2 | — | — | — | — | — | 47× over |
| Bromochloroacetic acid Disinfection byproduct |
0.154 ppb | 0.02 | — | — | — | — | — | 7.7× over |
| Chromium (hexavalent) Heavy metal |
0.0618 ppb | 0.02 | — | — | — | — | — | 3.1× over |
| Nitrate Inorganic |
0.41 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.9× over |
| Nitrate and nitrite Inorganic |
0.269 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.9× over |
| Chlorate Disinfection byproduct |
136.8 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Dibromochloromethane Disinfection byproduct |
0.058 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.37 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.478 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.095 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.025 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0944 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.64 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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 PASCO WATER DEPARTMENT.