What was found in West Richland'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 | 3400 µg/L 34% of the EPA limit 10000 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019
Highest in the city: 12970 µg/L — Plymouth Water District · 288 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 3012 µg/L 30% of the EPA limit 10000 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019
Highest in the city: 9635 µg/L — Plymouth Water District · 288 people · 2017 | 2/3 | SYR4 |
| Fluoride | 3190.5 µg/L 80% of the EPA limit 4000 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019
Highest in the city: 3742.5 µg/L — PATERSON HEIGHTS WATER ASSN · 85 people · 2019 | 3/3 | SYR4 |
| Barium | 77.355 µg/L 3.9% of the EPA limit 2000 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 2/3 | SYR4 |
| TTHM | 71.97 µg/L 90% of the EPA limit 80 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 3/3 | SYR4 |
| Chloroform | 64.2 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 47.5 µg/L 79% of the EPA limit 60 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 3/3 | SYR4 |
| Lithium | 31.9 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2024 | 1/3 | UCMR-5 |
| Trichloroacetic Acid | 28.845 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 21.05 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 1/3 | SYR4 |
| Bromoform | 7.29 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019
Highest in the city: 14.44 µg/L — PATERSON HEIGHTS WATER ASSN · 85 people · 2017 | 3/3 | SYR4 |
| Dibromochloromethane | 11.65 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 8.8 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 6.4 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 3/3 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019
Highest in the city: 4.9 µg/L — Plymouth Water District · 288 people · 2017 | 3/3 | SYR4 |
| Arsenic | 3.9 µg/L 39% of the EPA limit 10 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 2/3 | SYR4 |
| Monochloroacetic Acid | 2.29 µg/L No EPA limit set Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 1/3 | SYR4 |
| Chromium | 1.019 µg/L 1% of the EPA limit 100 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019
Highest in the city: 2 µg/L — Plymouth Water District · 288 people · 2017 | 2/3 | SYR4 |
| Copper | 1.71 µg/L 0.1% of the EPA limit 1300 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 1/3 | SYR4 |
| Tetrachloroethylene | 0.6000 µg/L 12% of the EPA limit 5 µg/L Highest in the city: Plymouth Water District · 288 people · 2019 | 1/3 | SYR4 |
| Antimony, Total | 0.0500 µg/L 0.8% of the EPA limit 6 µg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WEST RICHLAND CITY OF · 21,231 people · 2024
Highest in the city: 0.00060 mg/L — Plymouth Water District · 288 people · 2024 | 3/3 | 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 West Richland
| Supplier | Population served |
|---|---|
| WEST RICHLAND CITY OF | 21,231 |
| Plymouth Water District | 288 |
| PATERSON HEIGHTS WATER ASSN | 85 |
Frequently asked questions about West Richland tap water
Is West Richland tap water safe to drink?
EPA testing detected 22 contaminants in the water serving West Richland. 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 West Richland?
3 public water suppliers report drinking-water monitoring for West Richland, Washington to the EPA. Each is listed above with its population served.
What contaminants are in West Richland's water?
The contaminants EPA monitoring detected in West Richland include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. 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.