What was found in Grafton'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 | 2295 µg/L 23% of the EPA limit 10000 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 2/3 | SYR4 |
| Nitrate-Nitrite | 2080 µg/L 21% of the EPA limit 10000 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017 | 1/3 | SYR4 |
| Fluoride | 1070 µg/L 27% of the EPA limit 4000 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 3/3 | SYR4 |
| Copper | 561.5 µg/L 43% of the EPA limit 1300 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017 | 3/3 | SYR4 |
| Barium | 150 µg/L 7.5% of the EPA limit 2000 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017 | 3/3 | SYR4 |
| 1,1,1-Trichloroethane | 55.4 µg/L 28% of the EPA limit 200 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Trichloroethylene | 31.05 µg/L 621% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Arsenic | 3.955 µg/L 40% of the EPA limit 10 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017
Highest in the city: 21.5 µg/L — OSPREY MOBILE HOME PARK · 150 people · 2019 | 2/3 | SYR4 |
| TTHM | 19.995 µg/L 25% of the EPA limit 80 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| 1,1-Dichloroethylene | 17 µg/L 243% of the EPA limit, at the 95th percentile of samples — 7 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Chloroform | 9.49 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7.6755 µg/L 13% of the EPA limit 60 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Carbon Tetrachloride | 6.45 µg/L 129% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 6.38 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Lead | 5.05 µg/L 34% of the EPA limit 15 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017
Highest in the city: 5.9515 µg/L — STONECROFT CONDOMINIUM ASSN · 50 people · 2018 | 3/3 | SYR4 |
| Dibromochloromethane | 5.6 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| cis-1,2-Dichloroethylene | 4.9 µg/L 7% of the EPA limit 70 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 3.97 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Tetrachloroethylene | 3.9 µg/L 78% of the EPA limit 5 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.7955 pCi/L 25% of the EPA limit 15 pCi/L Highest in the city: OSPREY MOBILE HOME PARK · 150 people · 2018 | 2/3 | SYR4 |
| Trichloroacetic Acid | 3.75 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Bromoform | 1.985 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 1.795 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Gross Beta Particle Activity | 1.7525 pCi/L No EPA limit set Highest in the city: OSPREY MOBILE HOME PARK · 150 people · 2018 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.42 pCi/L 28% of the EPA limit 5 pCi/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017 | 3/3 | SYR4 |
| Monobromoacetic Acid | 0.6130 µg/L No EPA limit set Main supplier: GRAFTON WATERWORKS · 12,269 people · 2019 | 1/3 | SYR4 |
| Combined Uranium | 0.2400 µg/L 0.8% of the EPA limit 30 µg/L Highest in the city: OSPREY MOBILE HOME PARK · 150 people · 2012 | 1/3 | SYR4 |
| Thallium, Total | 0.2200 µg/L 11% of the EPA limit 2 µg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2017 | 1/3 | SYR4 |
| Lead | 0.0033 mg/L 22% of the EPA limit 0.0150 mg/L Main supplier: GRAFTON WATERWORKS · 12,269 people · 2023 | 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 Grafton
| Supplier | Population served |
|---|---|
| GRAFTON WATERWORKS | 12,269 |
| OSPREY MOBILE HOME PARK | 150 |
| STONECROFT CONDOMINIUM ASSN | 50 |
Frequently asked questions about Grafton tap water
Is Grafton tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Grafton. 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 Grafton?
3 public water suppliers report drinking-water monitoring for Grafton, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Grafton's water?
The contaminants EPA monitoring detected in Grafton 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.