What was found in Yakima's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 10100 µg/L 101% of the EPA limit, in the worst sample — 10000 µg/L | 55/68 | SYR4 |
| Nitrate-Nitrite | 10100 µg/L 101% of the EPA limit, in the worst sample — 10000 µg/L | 50/68 | SYR4 |
| Barium | 1532 µg/L 77% of the EPA limit 2000 µg/L | 41/68 | SYR4 |
| Fluoride | 1480 µg/L 37% of the EPA limit 4000 µg/L | 55/68 | SYR4 |
| TTHM | 78.8 µg/L 99% of the EPA limit 80 µg/L | 26/68 | SYR4 |
| Chloroform | 73.9 µg/L No EPA limit set | 19/68 | SYR4 |
| Chromium | 69 µg/L 69% of the EPA limit 100 µg/L | 27/68 | SYR4 |
| Total Haloacetic Acids (HAA5) | 53.9 µg/L 90% of the EPA limit 60 µg/L | 14/68 | SYR4 |
| Nitrite | 50 µg/L 5% of the EPA limit 1000 µg/L | 1/68 | SYR4 |
| Lithium | 40.2 µg/L No EPA limit set | 3/68 | UCMR-5 |
| Copper | 35.96 µg/L 2.8% of the EPA limit 1300 µg/L | 28/68 | SYR4 |
| Trichloroacetic Acid | 34.7 µg/L No EPA limit set | 5/68 | SYR4 |
| Combined Uranium | 28 µg/L 93% of the EPA limit 30 µg/L | 5/68 | SYR4 |
| Bromoform | 22.8 µg/L No EPA limit set | 22/68 | SYR4 |
| Dichloroacetic Acid | 21.9 µg/L No EPA limit set | 6/68 | SYR4 |
| Lead | 21 µg/L 140% of the EPA limit, in the worst sample — 15 µg/L | 44/68 | SYR4 |
| Dibromoacetic Acid | 16.3 µg/L No EPA limit set | 13/68 | SYR4 |
| Selenium | 13 µg/L 26% of the EPA limit 50 µg/L | 23/68 | SYR4 |
| Arsenic | 9.9 µg/L 99% of the EPA limit 10 µg/L | 53/68 | SYR4 |
| Gross Alpha, Excl. Radon And U | 8.97 pCi/L 60% of the EPA limit 15 pCi/L | 5/68 | SYR4 |
| Monochloroacetic Acid | 8.3 µg/L No EPA limit set | 2/68 | SYR4 |
| Dibromochloromethane | 7.9 µg/L No EPA limit set | 21/68 | SYR4 |
| Bromodichloromethane | 6.57 µg/L No EPA limit set | 15/68 | SYR4 |
| Antimony, Total | 5.9 µg/L 98% of the EPA limit 6 µg/L | 15/68 | SYR4 |
| Cadmium | 5 µg/L 100% of the EPA limit 5 µg/L | 3/68 | SYR4 |
| Monobromoacetic Acid | 4.4 µg/L No EPA limit set | 1/68 | SYR4 |
| Beryllium, Total | 3.8 µg/L 95% of the EPA limit 4 µg/L | 3/68 | SYR4 |
| Combined Radium (-226 And -228) | 3.8 pCi/L 76% of the EPA limit 5 pCi/L | 6/68 | SYR4 |
| Thallium, Total | 2.6 µg/L 130% of the EPA limit, in the worst sample — 2 µg/L | 29/68 | SYR4 |
| 1,1-Dichloroethylene | 2.4 µg/L 34% of the EPA limit 7 µg/L | 1/68 | SYR4 |
| Picloram | 0.1310 µg/L 0% of the EPA limit 500 µg/L | 1/68 | SYR4 |
| Lead | 0.0045 mg/L 30% of the EPA limit 0.0150 mg/L | 68/68 | LCR |
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, TTHM. The full list, with the highest level found 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.