What was found in Yakima's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 590 µg/L 5.9% of the EPA limit 10000 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 9368 µg/L — COUNTRY MOBILE ESTATES · 180 people · 2019 | 55/68 | SYR4 |
| Nitrate-Nitrite | 590 µg/L 5.9% of the EPA limit 10000 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 8340 µg/L — PANORAMA PLACE WATER ASSN · 220 people · 2019 | 50/68 | SYR4 |
| Barium | 19.155 µg/L 1% of the EPA limit 2000 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 1532 µg/L — BURMAN ACRES WATER · 92 people · 2018 | 41/68 | SYR4 |
| Fluoride | 804 µg/L 20% of the EPA limit 4000 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 1479.5 µg/L — SUNDQUIST SUNNYSLOPE DOMESTIC · 196 people · 2019 | 55/68 | SYR4 |
| Chromium | 3.235 µg/L 3.2% of the EPA limit 100 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 69 µg/L — PANORAMA PLACE WATER ASSN · 220 people · 2016 | 27/68 | SYR4 |
| TTHM | 64.8 µg/L 81% of the EPA limit 80 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019 | 26/68 | SYR4 |
| Chloroform | 61.76 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019 | 19/68 | SYR4 |
| Nitrite | 50 µg/L 5% of the EPA limit 1000 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019 | 1/68 | SYR4 |
| Total Haloacetic Acids (HAA5) | 44.25 µg/L 74% of the EPA limit 60 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 49.605 µg/L — COUNTRY CLUB ESTATES HOA · 70 people · 2016 | 14/68 | SYR4 |
| Lithium | 40.2 µg/L No EPA limit set Highest in the city: HI VALLEY VIEW · 67 people · 2024 | 3/68 | UCMR-5 |
| Copper | 14.518 µg/L 1.1% of the EPA limit 1300 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 34.343 µg/L — GLEED MOBILE ESTATES · 76 people · 2019 | 28/68 | SYR4 |
| Combined Uranium | 28 µg/L 93% of the EPA limit 30 µg/L Highest in the city: BRIDLE MOOR WATER ASSOCIATION · 44 people · 2016 | 5/68 | SYR4 |
| Trichloroacetic Acid | 27.36 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019 | 5/68 | SYR4 |
| Lead | 0.8380 µg/L 5.6% of the EPA limit 15 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 21 µg/L — COUNTRY SQUIRE MOBILE MANOR · 131 people · 2019 | 44/68 | SYR4 |
| Bromoform | 1.07 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 20 µg/L — YAK CO - CREWPORT · 192 people · 2019 | 22/68 | SYR4 |
| Dichloroacetic Acid | 19.11 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019 | 6/68 | SYR4 |
| Dibromoacetic Acid | 15.55 µg/L No EPA limit set Highest in the city: COUNTRY CLUB ESTATES HOA · 70 people · 2016 | 13/68 | SYR4 |
| Selenium | 1.581 µg/L 3.2% of the EPA limit 50 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 13 µg/L — BRIDLE MOOR WATER ASSOCIATION · 44 people · 2019 | 23/68 | SYR4 |
| Arsenic | 3.4875 µg/L 35% of the EPA limit 10 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 9.9 µg/L — STARKS MOBILE HOME COURT · 60 people · 2018 | 53/68 | SYR4 |
| Gross Alpha, Excl. Radon And U | 8.6265 pCi/L 58% of the EPA limit 15 pCi/L Highest in the city: BRIDLE MOOR WATER ASSOCIATION · 44 people · 2016 | 5/68 | SYR4 |
| Monochloroacetic Acid | 3.3 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 8.3 µg/L — COUNTRY CLUB ESTATES HOA · 70 people · 2016 | 2/68 | SYR4 |
| Dibromochloromethane | 1.605 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 7.525 µg/L — YAK CO - CREWPORT · 192 people · 2019 | 21/68 | SYR4 |
| Bromodichloromethane | 3.995 µg/L No EPA limit set Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 6.101 µg/L — NOB HILL WATER ASSOCIATION · 38,050 people · 2019 | 15/68 | SYR4 |
| Antimony, Total | 0.2740 µg/L 4.6% of the EPA limit 6 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 5.9 µg/L — SOUTH HILLS WATER USERS ASSN INC · 135 people · 2019 | 15/68 | SYR4 |
| Cadmium | 5 µg/L 100% of the EPA limit 5 µg/L Highest in the city: COUNTRY SQUIRE MOBILE MANOR · 131 people · 2019 | 3/68 | SYR4 |
| Monobromoacetic Acid | 4.4 µg/L No EPA limit set Highest in the city: COUNTRY CLUB ESTATES HOA · 70 people · 2016 | 1/68 | SYR4 |
| Combined Radium (-226 And -228) | 3.8 pCi/L 76% of the EPA limit 5 pCi/L Highest in the city: GREEN MEADOWS SUBDIVISION · 32 people · 2015 | 6/68 | SYR4 |
| Beryllium, Total | 3.63 µg/L 91% of the EPA limit 4 µg/L Highest in the city: HILLSIDE PARK ADDITION · 45 people · 2019 | 3/68 | SYR4 |
| Thallium, Total | 0.9015 µg/L 45% of the EPA limit 2 µg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2019
Highest in the city: 2.6 µg/L — EAST RIDGE PARK · 150 people · 2019 | 29/68 | SYR4 |
| 1,1-Dichloroethylene | 2.3685 µg/L 34% of the EPA limit 7 µg/L Highest in the city: YAK CO - CREWPORT · 192 people · 2019 | 1/68 | SYR4 |
| Picloram | 0.1310 µg/L 0% of the EPA limit 500 µg/L Highest in the city: PANORAMA PLACE WATER ASSN · 220 people · 2019 | 1/68 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: YAKIMA WATER DIVISION CITY OF · 112,858 people · 2024
Highest in the city: 0.0045 mg/L — BRIDLE MOOR WATER ASSOCIATION · 44 people · 2024 | 68/68 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Yakima
The 50 largest of 68 suppliers serving Yakima, by population served.
Frequently asked questions about Yakima tap water
Is Yakima tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Yakima. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Yakima?
68 public water suppliers report drinking-water monitoring for Yakima, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Yakima's water?
The contaminants EPA monitoring detected in Yakima include Nitrate, Nitrate-Nitrite, Barium, Fluoride, Chromium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.