What was found in Germantown'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 | 1425 µg/L 14% of the EPA limit 10000 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 2/3 | SYR4 |
| Nitrate-Nitrite | 1226 µg/L 12% of the EPA limit 10000 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2017 | 1/3 | SYR4 |
| Fluoride | 810 µg/L 20% of the EPA limit 4000 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 3/3 | SYR4 |
| Copper | 624 µg/L 48% of the EPA limit 1300 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2017 | 3/3 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2017
Highest in the city: 248.85 µg/L — BROOKSIDE MEADOWS MHP · 250 people · 2018 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 14.9093 pCi/L 99% of the EPA limit 15 pCi/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 3/3 | SYR4 |
| TTHM | 11 µg/L 14% of the EPA limit 80 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 10.0955 pCi/L 202% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 3/3 | SYR4 |
| Lead | 5.6 µg/L 37% of the EPA limit 15 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2017
Highest in the city: 7.54 µg/L — MAPLE TERRACE MHC · 124 people · 2018 | 3/3 | SYR4 |
| Dibromochloromethane | 4.24 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 3.49 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.776 µg/L 4.6% of the EPA limit 60 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Chloroform | 2.495 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Arsenic | 1.29 µg/L 13% of the EPA limit 10 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2017
Highest in the city: 2.3959 µg/L — BROOKSIDE MEADOWS MHP · 250 people · 2018 | 3/3 | SYR4 |
| Bromoform | 1.955 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 1.776 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Chromium | 1.74154 µg/L 1.7% of the EPA limit 100 µg/L Highest in the city: BROOKSIDE MEADOWS MHP · 250 people · 2018 | 2/3 | SYR4 |
| Dibromoacetic Acid | 1.46 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Trichloroacetic Acid | 0.5690 µg/L No EPA limit set Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 1/3 | SYR4 |
| Combined Uranium | 0.4969 µg/L 1.7% of the EPA limit 30 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2019 | 2/3 | SYR4 |
| Antimony, Total | 0.2500 µg/L 4.2% of the EPA limit 6 µg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2017 | 1/3 | SYR4 |
| Hexachlorocyclopentadiene | 0.0400 µg/L 0.1% of the EPA limit 50 µg/L Highest in the city: MAPLE TERRACE MHC · 124 people · 2018 | 1/3 | SYR4 |
| Thallium, Total | 0.0200 µg/L 1% of the EPA limit 2 µg/L Highest in the city: MAPLE TERRACE MHC · 124 people · 2018 | 1/3 | SYR4 |
| Lead | 0.0017 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: GERMANTOWN WATER UTILITY · 20,027 people · 2023
Highest in the city: 0.0033 mg/L — BROOKSIDE MEADOWS MHP · 250 people · 2024 | 3/3 | 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 Germantown
| Supplier | Population served |
|---|---|
| GERMANTOWN WATER UTILITY | 20,027 |
| BROOKSIDE MEADOWS MHP | 250 |
| MAPLE TERRACE MHC | 124 |
Frequently asked questions about Germantown tap water
Is Germantown tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Germantown. 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 Germantown?
3 public water suppliers report drinking-water monitoring for Germantown, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Germantown's water?
The contaminants EPA monitoring detected in Germantown include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.