What was found in Delavan'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 | 797.5 µg/L 8% of the EPA limit 10000 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2017
Highest in the city: 1319.5 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 3/8 | SYR4 |
| Copper | 1005 µg/L 77% of the EPA limit 1300 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2017
Highest in the city: 1294 µg/L — VINTAGE ON THE PONDS · 60 people · 2019 | 8/8 | SYR4 |
| Nitrate | 1100 µg/L 11% of the EPA limit 10000 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019 | 3/8 | SYR4 |
| Fluoride | 993.2 µg/L 25% of the EPA limit 4000 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019 | 6/8 | SYR4 |
| Barium | 335 µg/L 17% of the EPA limit 2000 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2017
Highest in the city: 736.1 µg/L — TOWN HALL APTS · 90 people · 2018 | 7/8 | SYR4 |
| Nitrite | 280 µg/L 28% of the EPA limit 1000 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2017 | 1/8 | SYR4 |
| TTHM | 2.828 µg/L 3.5% of the EPA limit 80 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 21.719 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 5/8 | SYR4 |
| 1,2-Dichloroethane | 18.34 µg/L 367% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the city: DELAVAN CLUB CONDOS · 395 people · 2018 | 1/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.97 pCi/L 20% of the EPA limit 15 pCi/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 14.02 pCi/L — PIONEER ESTATES OF DELAVAN · 400 people · 2018 | 6/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 0.6870 µg/L 1.1% of the EPA limit 60 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 13.6679 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 5/8 | SYR4 |
| Lead | 11.15 µg/L 74% of the EPA limit 15 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2017 | 7/8 | SYR4 |
| Monochloroacetic Acid | 10.4 µg/L No EPA limit set Highest in the city: WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 2/8 | SYR4 |
| Arsenic | 9.674 µg/L 97% of the EPA limit 10 µg/L Highest in the city: PIONEER ESTATES OF DELAVAN · 400 people · 2018 | 4/8 | SYR4 |
| Bromodichloromethane | 0.8880 µg/L No EPA limit set Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 9.195 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 3/8 | SYR4 |
| Combined Radium (-226 And -228) | 6.949 pCi/L 139% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019 | 8/8 | SYR4 |
| Dibromochloromethane | 2.65 µg/L No EPA limit set Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 6.376 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 2/8 | SYR4 |
| Chloroform | 1.72 µg/L No EPA limit set Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 6.35 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 5/8 | SYR4 |
| Gross Beta Particle Activity | 5.576 pCi/L No EPA limit set Highest in the city: PIONEER ESTATES OF DELAVAN · 400 people · 2018 | 3/8 | SYR4 |
| Chromium | 4.07411 µg/L 4.1% of the EPA limit 100 µg/L Highest in the city: WESTSHIRE FARMS AT THE LAKES · 300 people · 2018 | 2/8 | SYR4 |
| Bromoform | 3.7 µg/L No EPA limit set Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019 | 2/8 | SYR4 |
| Dichloroacetic Acid | 0.3190 µg/L No EPA limit set Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 2.84 µg/L — PIONEER ESTATES OF DELAVAN · 400 people · 2019 | 4/8 | SYR4 |
| Combined Uranium | 2.3495 µg/L 7.8% of the EPA limit 30 µg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019 | 1/8 | SYR4 |
| Thallium, Total | 1.64 µg/L 82% of the EPA limit 2 µg/L Highest in the city: PIONEER ESTATES OF DELAVAN · 400 people · 2018 | 1/8 | SYR4 |
| Selenium | 1.35 µg/L 2.7% of the EPA limit 50 µg/L Highest in the city: TOWN HALL APTS · 90 people · 2018 | 1/8 | SYR4 |
| Trichloroacetic Acid | 0.3800 µg/L No EPA limit set Main supplier: DELAVAN WATERWORKS · 9,028 people · 2019
Highest in the city: 0.8180 µg/L — WESTSHIRE FARMS AT THE LAKES · 300 people · 2019 | 3/8 | SYR4 |
| Xylenes, Total | 0.3300 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: DELAVAN CLUB CONDOS · 395 people · 2018 | 1/8 | SYR4 |
| Lead | 0.0100 mg/L 67% of the EPA limit 0.0150 mg/L Main supplier: DELAVAN WATERWORKS · 9,028 people · 2023 | 8/8 | 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 Delavan
| Supplier | Population served |
|---|---|
| DELAVAN WATERWORKS | 9,028 |
| PIONEER ESTATES OF DELAVAN | 400 |
| DELAVAN CLUB CONDOS | 395 |
| WESTSHIRE FARMS AT THE LAKES | 300 |
| TOWN HALL APTS | 90 |
| VINTAGE ON THE PONDS | 60 |
| SNUG HARBOR INN MHP | 30 |
| GENEVA LANDINGS | 25 |
Frequently asked questions about Delavan tap water
Is Delavan tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Delavan. 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 Delavan?
8 public water suppliers report drinking-water monitoring for Delavan, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Delavan's water?
The contaminants EPA monitoring detected in Delavan include Nitrate-Nitrite, Copper, Nitrate, 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.