What was found in Waunakee'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 | 4400 µg/L 44% of the EPA limit 10000 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017
Highest in the city: 11260 µg/L — DONS MOBILE MANOR · 160 people · 2019 | 2/4 | SYR4 |
| Nitrate | 5425 µg/L 54% of the EPA limit 10000 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019 | 2/4 | SYR4 |
| Fluoride | 870.5 µg/L 22% of the EPA limit 4000 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019
Highest in the city: 1400 µg/L — WESTPORT WATER UTILITY · 800 people · 2019 | 3/4 | SYR4 |
| Copper | 173 µg/L 13% of the EPA limit 1300 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017
Highest in the city: 182.95 µg/L — WESTPORT WATER UTILITY · 800 people · 2017 | 3/4 | SYR4 |
| Lead | 3.205 µg/L 21% of the EPA limit 15 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017
Highest in the city: 26.46 µg/L — DONS MOBILE MANOR · 160 people · 2019 | 3/4 | SYR4 |
| Barium | 24.1 µg/L 1.2% of the EPA limit 2000 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.9175 pCi/L 26% of the EPA limit 15 pCi/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2014
Highest in the city: 6.423 pCi/L — WESTPORT WATER UTILITY · 800 people · 2014 | 3/4 | SYR4 |
| TTHM | 3.235 µg/L 4% of the EPA limit 80 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019
Highest in the city: 5.448 µg/L — WESTPORT WATER UTILITY · 800 people · 2019 | 2/4 | SYR4 |
| Gross Beta Particle Activity | 3.8195 pCi/L No EPA limit set Highest in the city: WESTPORT WATER UTILITY · 800 people · 2014 | 2/4 | SYR4 |
| Chloroform | 1.088 µg/L No EPA limit set Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019
Highest in the city: 3.508 µg/L — WESTPORT WATER UTILITY · 800 people · 2019 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 3.4327 pCi/L 69% of the EPA limit 5 pCi/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017 | 3/4 | SYR4 |
| Chromium | 2.22 µg/L 2.2% of the EPA limit 100 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017
Highest in the city: 3 µg/L — DONS MOBILE MANOR · 160 people · 2018 | 2/4 | SYR4 |
| Bromodichloromethane | 1.0595 µg/L No EPA limit set Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019
Highest in the city: 1.5305 µg/L — WESTPORT WATER UTILITY · 800 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 0.9650 µg/L 1.6% of the EPA limit 60 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019 | 1/4 | SYR4 |
| Dibromochloromethane | 0.9480 µg/L No EPA limit set Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019 | 2/4 | SYR4 |
| Combined Uranium | 0.8852 µg/L 3% of the EPA limit 30 µg/L Highest in the city: DONS MOBILE MANOR · 160 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 0.7200 µg/L No EPA limit set Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019 | 1/4 | SYR4 |
| Xylenes, Total | 0.6640 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: WESTPORT WATER UTILITY · 800 people · 2019 | 1/4 | SYR4 |
| Dibromoacetic Acid | 0.3880 µg/L No EPA limit set Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2019 | 1/4 | SYR4 |
| Thallium, Total | 0.2000 µg/L 10% of the EPA limit 2 µg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2017
Highest in the city: 0.2400 µg/L — DONS MOBILE MANOR · 160 people · 2018 | 2/4 | SYR4 |
| Lead | 0.0017 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: WAUNAKEE WATERWORKS · 14,879 people · 2023
Highest in the city: 0.0038 mg/L — DONS MOBILE MANOR · 160 people · 2024 | 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 Waunakee
| Supplier | Population served |
|---|---|
| WAUNAKEE WATERWORKS | 14,879 |
| WESTPORT WATER UTILITY | 800 |
| DONS MOBILE MANOR | 160 |
| WESTPORT BISHOPS BAY AREA | 80 |
Frequently asked questions about Waunakee tap water
Is Waunakee tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Waunakee. 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 Waunakee?
4 public water suppliers report drinking-water monitoring for Waunakee, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Waunakee's water?
The contaminants EPA monitoring detected in Waunakee include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Lead. 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.