What was found in Colville'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-Nitrite | 790 µg/L 7.9% of the EPA limit 10000 µg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2017
Highest in the city: 11200 µg/L — COUNTRY VILLA MOBILE PARK · 162 people · 2016 | 5/7 | SYR4 |
| Nitrate | 810 µg/L 8.1% of the EPA limit 10000 µg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019
Highest in the city: 8301 µg/L — COUNTRY VILLA MOBILE PARK · 162 people · 2019 | 6/7 | SYR4 |
| Barium | 119.5 µg/L 6% of the EPA limit 2000 µg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2017
Highest in the city: 437.4 µg/L — ARDEN HILLS WATER SYSTEM · 80 people · 2019 | 7/7 | SYR4 |
| Fluoride | 287.5 µg/L 7.2% of the EPA limit 4000 µg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2017
Highest in the city: 423.2 µg/L — COUNTRY VILLA MOBILE PARK · 162 people · 2016 | 5/7 | SYR4 |
| Combined Uranium | 34.005 µg/L 113% of the EPA limit, at the 95th percentile of samples — 30 µg/L Highest in the city: COUNTRY VILLA MOBILE PARK · 162 people · 2019 | 3/7 | SYR4 |
| Selenium | 29 µg/L 58% of the EPA limit 50 µg/L Highest in the city: ARDEN HILLS WATER SYSTEM · 80 people · 2019 | 4/7 | SYR4 |
| Arsenic | 21.4505 µg/L 215% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: HUNTERS WATER DISTRICT · 290 people · 2019 | 6/7 | SYR4 |
| Copper | 13.7365 µg/L 1.1% of the EPA limit 1300 µg/L Highest in the city: ARDEN HILLS WATER SYSTEM · 80 people · 2019 | 6/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 12.7895 pCi/L 85% of the EPA limit 15 pCi/L Highest in the city: WILLIAMS LAKE ROAD SUBDIVISION · 40 people · 2015 | 1/7 | SYR4 |
| TTHM | 7.52 µg/L 9.4% of the EPA limit 80 µg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019 | 3/7 | SYR4 |
| Combined Radium (-226 And -228) | 4.12 pCi/L 82% of the EPA limit 5 pCi/L Highest in the city: WILLIAMS LAKE ROAD SUBDIVISION · 40 people · 2012 | 2/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.4485 µg/L 2.4% of the EPA limit 60 µg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2018
Highest in the city: 4.037 µg/L — EVANS WATER SYSTEM · 47 people · 2017 | 2/7 | SYR4 |
| Chloroform | 2.6045 µg/L No EPA limit set Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019
Highest in the city: 3.102 µg/L — EVANS WATER SYSTEM · 47 people · 2017 | 3/7 | SYR4 |
| Lead | 3.04 µg/L 20% of the EPA limit 15 µg/L Highest in the city: ARDEN HILLS WATER SYSTEM · 80 people · 2019 | 1/7 | SYR4 |
| Antimony, Total | 2.96 µg/L 49% of the EPA limit 6 µg/L Highest in the city: WILLIAMS LAKE ROAD SUBDIVISION · 40 people · 2015 | 1/7 | SYR4 |
| Bromodichloromethane | 2.806 µg/L No EPA limit set Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019 | 2/7 | SYR4 |
| Dichloroacetic Acid | 1.4485 µg/L No EPA limit set Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019
Highest in the city: 2.764 µg/L — EVANS WATER SYSTEM · 47 people · 2017 | 2/7 | SYR4 |
| Chromium | 2.49 µg/L 2.5% of the EPA limit 100 µg/L Highest in the city: PANORAMA MOBILE HOME PARK · 150 people · 2019 | 3/7 | SYR4 |
| Dibromochloromethane | 2.453 µg/L No EPA limit set Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019 | 1/7 | SYR4 |
| Trichloroacetic Acid | 1.34 µg/L No EPA limit set Highest in the city: EVANS WATER SYSTEM · 47 people · 2017 | 1/7 | SYR4 |
| Cadmium | 1.25 µg/L 25% of the EPA limit 5 µg/L Highest in the city: PANORAMA MOBILE HOME PARK · 150 people · 2019 | 1/7 | SYR4 |
| Bromoform | 1.215 µg/L No EPA limit set Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2019 | 1/7 | SYR4 |
| Lead | 0.0011 mg/L 7.3% of the EPA limit 0.0150 mg/L Main supplier: COLVILLE WATER DEPARTMENT · 4,945 people · 2023
Highest in the city: 0.0014 mg/L — COUNTRY VILLA MOBILE PARK · 162 people · 2025 | 7/7 | 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 Colville
| Supplier | Population served |
|---|---|
| COLVILLE WATER DEPARTMENT | 4,945 |
| HUNTERS WATER DISTRICT | 290 |
| COUNTRY VILLA MOBILE PARK | 162 |
| PANORAMA MOBILE HOME PARK | 150 |
| ARDEN HILLS WATER SYSTEM | 80 |
| EVANS WATER SYSTEM | 47 |
| WILLIAMS LAKE ROAD SUBDIVISION | 40 |
Frequently asked questions about Colville tap water
Is Colville tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Colville. 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 Colville?
7 public water suppliers report drinking-water monitoring for Colville, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Colville's water?
The contaminants EPA monitoring detected in Colville include Nitrate-Nitrite, Nitrate, Barium, Fluoride, Combined Uranium. 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.