Tap Water Quality Report
Tap water quality in Yakima, Washington
Tap water in Yakima, Washington receives a grade of C (73/100) from TapWaterSafety.org. It's served by YAKIMA WATER DIVISION CITY OF. 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; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Yakima's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Yakima.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 25.5 ppb, 426x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 27.3 ppb, 273x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 30.1 ppb, 201x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.115 ppb.
EPA compliance record
Official U.S. EPA records for YAKIMA WATER DIVISION CITY OF (system ID WA5399150) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Consumer Confidence Rule | Other (e.g. public notice) | 07/01/2024 | 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 Yakima
Filters matched to the specific contaminants in Yakima'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.
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 Yakima'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 |
25.5 ppb | 0.06 | — | — | — | — | — | 426× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
27.3 ppb | 0.1 | 60.0 | 60 | — | — | — | 273× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
30.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 201× over |
| Trichloroacetic acid Disinfection byproduct |
13.2 ppb | 0.1 | — | — | — | — | — | 132× over |
| Chloroform Disinfection byproduct |
29.3 ppb | 0.4 | — | — | — | — | — | 73× over |
| Chromium (hexavalent) Heavy metal |
0.979 ppb | 0.02 | — | — | — | — | — | 49× over |
| Dichloroacetic acid Disinfection byproduct |
7.69 ppb | 0.2 | — | — | — | — | — | 38× over |
| Bromodichloromethane Disinfection byproduct |
2.18 ppb | 0.06 | — | — | — | — | — | 36× over |
| Arsenic Heavy metal |
0.115 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 29× over |
| Bromochloroacetic acid Disinfection byproduct |
0.0835 ppb | 0.02 | — | — | — | — | — | 4.2× over |
| Dibromochloromethane Disinfection byproduct |
0.243 ppb | 0.1 | — | — | — | — | — | 2.4× over |
| Nitrate Inorganic |
0.262 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.9× over |
| Nitrate and nitrite Inorganic |
0.251 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.8× over |
| Thallium Heavy metal |
0.115 ppb | 0.1 | 2.0 | — | — | — | — | 1.1× over |
| Vanadium Other |
11.3 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
50.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
4.4 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Molybdenum Other |
0.367 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
4.15 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0204 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0493 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.79 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.621 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 YAKIMA WATER DIVISION CITY OF.