What was found in Thiensville'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 | 22 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2017
Highest in the city: 2900 µg/L — LAUREL LAKES 608 · 80 people · 2019 | 13/16 | SYR4 |
| Nitrate-Nitrite | 1400 µg/L 14% of the EPA limit 10000 µg/L Highest in the city: LAUREL LAKES 608 · 80 people · 2018 | 5/16 | SYR4 |
| Fluoride | 660 µg/L 17% of the EPA limit 4000 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2018
Highest in the city: 1100 µg/L — WILLIAMSBURG 220 · 32 people · 2018 | 16/16 | SYR4 |
| Copper | 265.1 µg/L 20% of the EPA limit 1300 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2018
Highest in the city: 275 µg/L — LAUREL LAKES 608 · 80 people · 2018 | 16/16 | SYR4 |
| Barium | 32.6 µg/L 1.6% of the EPA limit 2000 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2018
Highest in the city: 245 µg/L — HEIDEL RD APTS 152 · 40 people · 2018 | 16/16 | SYR4 |
| Toluene | 34 µg/L 3.4% of the EPA limit 1000 µg/L Highest in the city: LAUREL LAKES 508 · 50 people · 2018 | 1/16 | SYR4 |
| Lead | 5.568 µg/L 37% of the EPA limit 15 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2018
Highest in the city: 17.42 µg/L — HEIDEL RD APTS 139 · 40 people · 2018 | 14/16 | SYR4 |
| Nitrite | 11.5 µg/L 1.2% of the EPA limit 1000 µg/L Highest in the city: GRAND AVE APARTMENTS · 80 people · 2018 | 1/16 | SYR4 |
| Arsenic | 5.89 µg/L 59% of the EPA limit 10 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2018
Highest in the city: 8.76 µg/L — LINDEN LANE APTS 117 · 90 people · 2018 | 14/16 | SYR4 |
| 1,2-Dichloropropane | 6.9 µg/L 138% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the city: HEIDEL RD APTS 152 · 40 people · 2019 | 1/16 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.5075 pCi/L 43% of the EPA limit 15 pCi/L Main supplier: CENTURY ESTATES 1 · 130 people · 2015 | 9/16 | SYR4 |
| Chromium | 4 µg/L 4% of the EPA limit 100 µg/L Highest in the city: VILLAGE GLEN APTS · 30 people · 2018 | 5/16 | SYR4 |
| Combined Radium (-226 And -228) | 0.9050 pCi/L 18% of the EPA limit 5 pCi/L Main supplier: CENTURY ESTATES 1 · 130 people · 2015
Highest in the city: 3.17455 pCi/L — WILLIAMSBURG 220 · 32 people · 2018 | 15/16 | SYR4 |
| Chloroform | 2.4 µg/L No EPA limit set Highest in the city: LAUREL LAKES 508 · 50 people · 2015 | 1/16 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.6 µg/L 27% of the EPA limit 6 µg/L Highest in the city: HEIDEL RD APTS 152 · 40 people · 2018 | 1/16 | SYR4 |
| Styrene | 0.3400 µg/L 0.3% of the EPA limit 100 µg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2018
Highest in the city: 0.3500 µg/L — ALBERTA SUBDIVISION · 75 people · 2018 | 3/16 | SYR4 |
| Combined Uranium | 0.2840 µg/L 0.9% of the EPA limit 30 µg/L Highest in the city: WILLIAMSBURG 220 · 32 people · 2018 | 2/16 | SYR4 |
| Lead | 0.00072 mg/L 4.8% of the EPA limit 0.0150 mg/L Main supplier: CENTURY ESTATES 1 · 130 people · 2024
Highest in the city: 0.0060 mg/L — HEIDEL RD APTS 139 · 40 people · 2024 | 16/16 | 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 Thiensville
| Supplier | Population served |
|---|---|
| CENTURY ESTATES 1 | 130 |
| VILLAGE HEIGHTS | 130 |
| LINDEN LANE APTS 117 | 90 |
| GRAND AVE APARTMENTS | 80 |
| LAUREL LAKES 608 | 80 |
| ALBERTA SUBDIVISION | 75 |
| LINDEN LANE APTS 141 | 75 |
| WILLIAMSBURG 207 209 AND 214 | 70 |
| WATERS EDGE CONDOMINIUM ASSOCIATION | 50 |
| LAUREL LAKES 508 | 50 |
| WILLIAMSBURG 206 | 48 |
| HEIDEL RD APTS 139 | 40 |
| HEIDEL RD APTS 152 | 40 |
| WILLIAMSBURG 220 | 32 |
| VILLAGE GLEN APTS | 30 |
| RIVER GARDEN APTS | 25 |
Frequently asked questions about Thiensville tap water
Is Thiensville tap water safe to drink?
EPA testing detected 18 contaminants in the water serving Thiensville. 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 Thiensville?
16 public water suppliers report drinking-water monitoring for Thiensville, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Thiensville's water?
The contaminants EPA monitoring detected in Thiensville 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.