What was found in Hayward'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 | 4263 µg/L 43% of the EPA limit 10000 µg/L Highest in the city: BIG MUSKY RESORT · 25 people · 2018 | 3/7 | SYR4 |
| TTHM | 2661.5 µg/L 3327% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: DRY TOWN · 3,030 people · 2019 | 4/7 | SYR4 |
| Copper | 130 µg/L 10% of the EPA limit 1300 µg/L Main supplier: DRY TOWN · 3,030 people · 2019
Highest in the city: 1748 µg/L — NEW POST · 150 people · 2019 | 7/7 | SYR4 |
| Nitrate | 49 µg/L 0.5% of the EPA limit 10000 µg/L Main supplier: DRY TOWN · 3,030 people · 2018
Highest in the city: 1600 µg/L — HAYWARD WATER UTILITY · 2,552 people · 2019 | 7/7 | SYR4 |
| Fluoride | 99.7 µg/L 2.5% of the EPA limit 4000 µg/L Main supplier: DRY TOWN · 3,030 people · 2019
Highest in the city: 1010 µg/L — HAYWARD WATER UTILITY · 2,552 people · 2019 | 6/7 | SYR4 |
| Barium | 13.85 µg/L 0.7% of the EPA limit 2000 µg/L Main supplier: DRY TOWN · 3,030 people · 2019
Highest in the city: 97.675 µg/L — TAMARACK HEALTH HAYWARD MEDICAL CENTER · 85 people · 2018 | 7/7 | SYR4 |
| Lead | 3 µg/L 20% of the EPA limit 15 µg/L Main supplier: DRY TOWN · 3,030 people · 2019
Highest in the city: 71.2 µg/L — NEW POST · 150 people · 2019 | 7/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 14.9 µg/L 25% of the EPA limit 60 µg/L Main supplier: DRY TOWN · 3,030 people · 2019 | 4/7 | SYR4 |
| Cyanide | 13 µg/L 6.5% of the EPA limit 200 µg/L Highest in the city: NEW POST · 150 people · 2019 | 1/7 | SYR4 |
| Monochloroacetic Acid | 7.36 µg/L No EPA limit set Highest in the city: TAMARACK HEALTH HAYWARD MEDICAL CENTER · 85 people · 2019 | 1/7 | SYR4 |
| Chloroform | 6.595 µg/L No EPA limit set Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2019 | 2/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.2040 pCi/L 1.4% of the EPA limit 15 pCi/L Main supplier: DRY TOWN · 3,030 people · 2016
Highest in the city: 4.4725 pCi/L — HAYWARD WATER UTILITY · 2,552 people · 2017 | 5/7 | SYR4 |
| Combined Radium (-226 And -228) | 4.3175 pCi/L 86% of the EPA limit 5 pCi/L Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2017 | 6/7 | SYR4 |
| Bromodichloromethane | 4.242 µg/L No EPA limit set Highest in the city: TAMARACK HEALTH HAYWARD MEDICAL CENTER · 85 people · 2019 | 2/7 | SYR4 |
| Dibromochloromethane | 2.91 µg/L No EPA limit set Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2019 | 2/7 | SYR4 |
| Dichloroacetic Acid | 2.65 µg/L No EPA limit set Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2019 | 2/7 | SYR4 |
| Arsenic | 2.075 µg/L 21% of the EPA limit 10 µg/L Main supplier: DRY TOWN · 3,030 people · 2019
Highest in the city: 2.425 µg/L — BIG MUSKY RESORT · 25 people · 2018 | 5/7 | SYR4 |
| Combined Uranium | 1.84 µg/L 6.1% of the EPA limit 30 µg/L Highest in the city: TAMARACK HEALTH HAYWARD MEDICAL CENTER · 85 people · 2018 | 3/7 | SYR4 |
| Trichloroacetic Acid | 1.77 µg/L No EPA limit set Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2019 | 2/7 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.5 µg/L 25% of the EPA limit 6 µg/L Highest in the city: BIG MUSKY RESORT · 25 people · 2018 | 1/7 | SYR4 |
| Chromium | 1.2 µg/L 1.2% of the EPA limit 100 µg/L Highest in the city: NEW POST · 150 people · 2019 | 2/7 | SYR4 |
| Bromoform | 1 µg/L No EPA limit set Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2019 | 1/7 | SYR4 |
| Dibromoacetic Acid | 0.8680 µg/L No EPA limit set Highest in the city: HAYWARD WATER UTILITY · 2,552 people · 2019 | 2/7 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: DRY TOWN · 3,030 people · 2025
Highest in the city: 0.0020 mg/L — NEW POST · 150 people · 2025 | 7/7 | 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 Hayward
| Supplier | Population served |
|---|---|
| DRY TOWN | 3,030 |
| HAYWARD WATER UTILITY | 2,552 |
| NEW POST | 150 |
| S AND J WILD RIVER MHP | 90 |
| TAMARACK HEALTH HAYWARD MEDICAL CENTER | 85 |
| LUEDTKES MOBILE HOME PARK | 50 |
| BIG MUSKY RESORT | 25 |
Frequently asked questions about Hayward tap water
Is Hayward tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Hayward. 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 Hayward?
7 public water suppliers report drinking-water monitoring for Hayward, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Hayward's water?
The contaminants EPA monitoring detected in Hayward include Nitrate-Nitrite, TTHM, Copper, Nitrate, Fluoride. 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.