What was found in Eau Claire'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 | 2400 µg/L 24% of the EPA limit 10000 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 11700 µg/L — PINE EDGE MHP · 300 people · 2019 | 8/8 | SYR4 |
| Nitrate-Nitrite | 2055 µg/L 21% of the EPA limit 10000 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 9650 µg/L — PINE EDGE MHP · 300 people · 2018 | 8/8 | SYR4 |
| Copper | 61 µg/L 4.7% of the EPA limit 1300 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 1935 µg/L — PRIORY THE · 185 people · 2019 | 8/8 | SYR4 |
| Fluoride | 1130 µg/L 28% of the EPA limit 4000 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 4/8 | SYR4 |
| Barium | 27.9 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 44 µg/L — COZY MHP LLC FRONT · 111 people · 2018 | 8/8 | SYR4 |
| TTHM | 36.544 µg/L 46% of the EPA limit 80 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 2/8 | SYR4 |
| Chloroform | 33.35 µg/L No EPA limit set Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 1/8 | SYR4 |
| Lead | 14 µg/L 93% of the EPA limit 15 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2017
Highest in the city: 32 µg/L — PRIORY THE · 185 people · 2019 | 8/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.8216 pCi/L 5.5% of the EPA limit 15 pCi/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 13.465 pCi/L — VILLA DIANN MHP · 420 people · 2019 | 4/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.696 µg/L 16% of the EPA limit 60 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 2/8 | SYR4 |
| Combined Radium (-226 And -228) | 0.9586 pCi/L 19% of the EPA limit 5 pCi/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 9.3725 pCi/L — VILLA DIANN MHP · 420 people · 2019 | 8/8 | SYR4 |
| Dichloroacetic Acid | 5.83 µg/L No EPA limit set Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 2/8 | SYR4 |
| Trichloroacetic Acid | 4.73 µg/L No EPA limit set Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 1/8 | SYR4 |
| Bromodichloromethane | 4.69 µg/L No EPA limit set Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 2/8 | SYR4 |
| Chromium | 3 µg/L 3% of the EPA limit 100 µg/L Highest in the city: BONNIE VALE PARK 2 · 51 people · 2018 | 2/8 | SYR4 |
| Trichloroethylene | 1.2 µg/L 24% of the EPA limit 5 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019 | 1/8 | SYR4 |
| Dibromochloromethane | 0.6400 µg/L No EPA limit set Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2019
Highest in the city: 0.7605 µg/L — VILLA DIANN MHP · 420 people · 2019 | 2/8 | SYR4 |
| Dibromoacetic Acid | 0.4100 µg/L No EPA limit set Highest in the city: VILLA DIANN MHP · 420 people · 2019 | 1/8 | SYR4 |
| Combined Uranium | 0.2060 µg/L 0.7% of the EPA limit 30 µg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2018 | 1/8 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: EAU CLAIRE WATERWORKS · 70,587 people · 2023
Highest in the city: 0.0076 mg/L — COZY MHP LLC BACK · 35 people · 2024 | 8/8 | 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 Eau Claire
| Supplier | Population served |
|---|---|
| EAU CLAIRE WATERWORKS | 70,587 |
| VILLA DIANN MHP | 420 |
| PINE EDGE MHP | 300 |
| PRIORY THE | 185 |
| COZY MHP LLC FRONT | 111 |
| BONNIE VALE PARK 1 | 70 |
| BONNIE VALE PARK 2 | 51 |
| COZY MHP LLC BACK | 35 |
Frequently asked questions about Eau Claire tap water
Is Eau Claire tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Eau Claire. 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 Eau Claire?
8 public water suppliers report drinking-water monitoring for Eau Claire, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Eau Claire's water?
The contaminants EPA monitoring detected in Eau Claire include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Barium. 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.