What was found in Pewaukee'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 | 250 µg/L 2.5% of the EPA limit 10000 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019
Highest in the city: 4220 µg/L — COUNTRY COURT SUBDIVISION · 45 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 160 µg/L 1.6% of the EPA limit 10000 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017
Highest in the city: 2460 µg/L — COUNTRY COURT SUBDIVISION · 45 people · 2018 | 3/4 | SYR4 |
| Copper | 221 µg/L 17% of the EPA limit 1300 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017
Highest in the city: 860.5 µg/L — PEWAUKEE VILLAGE WATERWORKS · 8,166 people · 2019 | 4/4 | SYR4 |
| Fluoride | 445 µg/L 11% of the EPA limit 4000 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017
Highest in the city: 745.6 µg/L — PEWAUKEE VILLAGE WATERWORKS · 8,166 people · 2019 | 4/4 | SYR4 |
| Barium | 185 µg/L 9.3% of the EPA limit 2000 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017 | 4/4 | SYR4 |
| TTHM | 29.86 µg/L 37% of the EPA limit 80 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Lead | 18.2 µg/L 121% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 14.945 pCi/L 100% of the EPA limit 15 pCi/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019
Highest in the city: 16.4 pCi/L — OAKTON BEACH · 144 people · 2019 | 3/4 | SYR4 |
| Combined Radium (-226 And -228) | 6.53 pCi/L 131% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019
Highest in the city: 9.651 pCi/L — OAKTON BEACH · 144 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 9.22 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Bromodichloromethane | 8.02 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Chloroform | 6.895 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Arsenic | 6.13 µg/L 61% of the EPA limit 10 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017 | 2/4 | SYR4 |
| Xylenes, Total | 5.695 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 1/4 | SYR4 |
| Combined Uranium | 5.22667 µg/L 17% of the EPA limit 30 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.678 µg/L 7.8% of the EPA limit 60 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Bromoform | 3.66 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Dichloroacetic Acid | 2.3 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 1.59 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Trichloroacetic Acid | 1.4825 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 2/4 | SYR4 |
| Ethylbenzene | 0.7080 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 0.4000 µg/L No EPA limit set Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2019 | 1/4 | SYR4 |
| Mercury | 0.3100 µg/L 16% of the EPA limit 2 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017 | 1/4 | SYR4 |
| Thallium, Total | 0.2300 µg/L 12% of the EPA limit 2 µg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2017 | 1/4 | SYR4 |
| Lead | 0.0026 mg/L 17% of the EPA limit 0.0150 mg/L Main supplier: PEWAUKEE CITY WATER AND SEWER UTILITY · 8,671 people · 2023 | 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 Pewaukee
| Supplier | Population served |
|---|---|
| PEWAUKEE CITY WATER AND SEWER UTILITY | 8,671 |
| PEWAUKEE VILLAGE WATERWORKS | 8,166 |
| OAKTON BEACH | 144 |
| COUNTRY COURT SUBDIVISION | 45 |
Frequently asked questions about Pewaukee tap water
Is Pewaukee tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Pewaukee. 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 Pewaukee?
4 public water suppliers report drinking-water monitoring for Pewaukee, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Pewaukee's water?
The contaminants EPA monitoring detected in Pewaukee 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.