Water Quality Report · Updated May 12, 2026
PASCO WATER DEPARTMENT
PASCO WATER DEPARTMENT delivers tap water graded C (67/100) by TapWaterSafety.org. The utility serves approximately 115,102 residents in Pasco, Washington using surface water. 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.
Is Pasco tap water safe to drink?
PASCO WATER DEPARTMENT delivers tap water that earns a grade of C (67/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 115,102 residents in Pasco, drawing from surface water.
Public testing data identifies 11 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Trichloroacetic acid, Chloroform, Bromodichloromethane, Dichloroacetic acid, Bromochloroacetic acid, Chromium (hexavalent), Nitrate, Nitrate and nitrite. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for Pasco residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for PASCO WATER DEPARTMENT.
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.
Contact PASCO WATER DEPARTMENT
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for Pasco
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 67/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
PASCO WATER DEPARTMENT service area
This water system serves 1 community in Franklin County, Washington. Click any city for its dedicated tap water quality page.
Find the right filter for Pasco water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.