What was found in Benton City'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 | 5406 µg/L 54% of the EPA limit 10000 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019
Highest in the city: 18000 µg/L — COXVILLE WATER ASSN #1 · 26 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 4952 µg/L 50% of the EPA limit 10000 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019
Highest in the city: 16500 µg/L — COXVILLE WATER ASSN #1 · 26 people · 2019 | 3/4 | SYR4 |
| Fluoride | 576.75 µg/L 14% of the EPA limit 4000 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019
Highest in the city: 1870 µg/L — COXVILLE WATER ASSN #1 · 26 people · 2019 | 4/4 | SYR4 |
| Barium | 104.1 µg/L 5.2% of the EPA limit 2000 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 3/4 | SYR4 |
| TTHM | 26.72 µg/L 33% of the EPA limit 80 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 2/4 | SYR4 |
| Nitrite | 20 µg/L 2% of the EPA limit 1000 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Combined Uranium | 18.8 µg/L 63% of the EPA limit 30 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2012 | 1/4 | SYR4 |
| Bromoform | 18.43 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Lithium | 15.4 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| Copper | 9.65 µg/L 0.7% of the EPA limit 1300 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019
Highest in the city: 12.4725 µg/L — BAR 80 RANCHETTES · 32 people · 2019 | 3/4 | SYR4 |
| Selenium | 3.615 µg/L 7.2% of the EPA limit 50 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019
Highest in the city: 12 µg/L — COXVILLE WATER ASSN #1 · 26 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 8.375 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 6.64 µg/L 11% of the EPA limit 60 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Arsenic | 5.55 µg/L 55% of the EPA limit 10 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 5.12 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Bromodichloromethane | 2.555 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 1.98 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 1.2 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: BENTON CITY WATER · 5,626 people · 2019 | 1/4 | SYR4 |
| Chloroform | 0.5000 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2019
Highest in the city: 0.9900 µg/L — COXVILLE WATER ASSN #1 · 26 people · 2015 | 2/4 | SYR4 |
| Asbestos | 0.9850 MFL 14% of the EPA limit 7 MFL Main supplier: BENTON CITY WATER · 5,626 people · 2013 | 1/4 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.0849 µg/L 0.1% of the EPA limit 70 µg/L Highest in the city: MOUNT ADAMS VISTA WATER SYSTEM · 34 people · 2019 | 1/4 | SYR4 |
| P-Dichlorobenzene | 0.0491 µg/L 0.1% of the EPA limit 75 µg/L Highest in the city: MOUNT ADAMS VISTA WATER SYSTEM · 34 people · 2019 | 1/4 | SYR4 |
| PFHXS | 0.0143 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| PFOS | 0.0087 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| Pfhxa | 0.0055 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| Pfpea | 0.0053 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| Pfpes | 0.0049 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| PFBS | 0.0045 µg/L No EPA limit set Main supplier: BENTON CITY WATER · 5,626 people · 2023 | 1/4 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: BENTON CITY WATER · 5,626 people · 2023
Highest in the city: 0.0010 mg/L — MOUNT ADAMS VISTA WATER SYSTEM · 34 people · 2025 | 4/4 | 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 Benton City
| Supplier | Population served |
|---|---|
| BENTON CITY WATER | 5,626 |
| MOUNT ADAMS VISTA WATER SYSTEM | 34 |
| BAR 80 RANCHETTES | 32 |
| COXVILLE WATER ASSN #1 | 26 |
Frequently asked questions about Benton City tap water
Is Benton City tap water safe to drink?
EPA testing detected 30 contaminants in the water serving Benton City. 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 Benton City?
4 public water suppliers report drinking-water monitoring for Benton City, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Benton City's water?
The contaminants EPA monitoring detected in Benton City 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.