What was found in Williams Bay'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 |
|---|---|---|---|
| Copper | 1750 µg/L 135% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Fluoride | 1220 µg/L 31% of the EPA limit 4000 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 257 µg/L 2.6% of the EPA limit 10000 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2017 | 1/1 | SYR4 |
| Nitrate | 230 µg/L 2.3% of the EPA limit 10000 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Nitrite | 169 µg/L 17% of the EPA limit 1000 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Barium | 16.9 µg/L 0.8% of the EPA limit 2000 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2017 | 1/1 | SYR4 |
| Lead | 11 µg/L 73% of the EPA limit 15 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.487 µg/L 9.1% of the EPA limit 60 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 5.015 µg/L No EPA limit set Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2.82 µg/L 28% of the EPA limit 10 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2017 | 1/1 | SYR4 |
| Chloroform | 2.1 µg/L No EPA limit set Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| TTHM | 2.1 µg/L 2.6% of the EPA limit 80 µg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 2 µg/L No EPA limit set Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 1.2 pCi/L 24% of the EPA limit 5 pCi/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2014 | 1/1 | SYR4 |
| Dibromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 0.6930 µg/L No EPA limit set Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0160 mg/L 107% above the EPA limit of 0.0150 mg/L Main supplier: WILLIAMS BAY WATERWORKS · 2,601 people · 2025 | 1/1 | LCR |
Water suppliers serving Williams Bay
| Supplier | Population served |
|---|---|
| WILLIAMS BAY WATERWORKS | 2,601 |
Frequently asked questions about Williams Bay tap water
Is Williams Bay tap water safe to drink?
EPA testing detected 17 contaminants in the water serving Williams Bay. 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 Williams Bay?
1 public water supplier report drinking-water monitoring for Williams Bay, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Williams Bay's water?
The contaminants EPA monitoring detected in Williams Bay include Copper, Fluoride, Nitrate-Nitrite, Nitrate, Nitrite. 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.