What was found in Marshfield'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 | 3940 µg/L 39% of the EPA limit 10000 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2017 | 2/2 | SYR4 |
| Nitrate | 3830 µg/L 38% of the EPA limit 10000 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 2/2 | SYR4 |
| Fluoride | 1149 µg/L 29% of the EPA limit 4000 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 2/2 | SYR4 |
| Copper | 455.5 µg/L 35% of the EPA limit 1300 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 2/2 | SYR4 |
| Barium | 127.5 µg/L 6.4% of the EPA limit 2000 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2017 | 2/2 | SYR4 |
| TTHM | 46.798 µg/L 58% of the EPA limit 80 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Chloroform | 22.8 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 15.461 µg/L 26% of the EPA limit 60 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Lead | 11.56 µg/L 77% of the EPA limit 15 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019
Highest in the city: 13.18 µg/L — BOARDWALK MHC LLC · 130 people · 2018 | 2/2 | SYR4 |
| Bromodichloromethane | 12 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.6635 pCi/L 31% of the EPA limit 15 pCi/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019
Highest in the city: 11.54 pCi/L — BOARDWALK MHC LLC · 130 people · 2015 | 2/2 | SYR4 |
| Trichloroacetic Acid | 7.99 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 7.16 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 5.35 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.9836 pCi/L 60% of the EPA limit 5 pCi/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2017 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 2.347 pCi/L No EPA limit set Highest in the city: BOARDWALK MHC LLC · 130 people · 2015 | 1/2 | SYR4 |
| Bromoform | 1.83 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 1.3514 µg/L 4.5% of the EPA limit 30 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Arsenic | 1.1 µg/L 11% of the EPA limit 10 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2017 | 1/2 | SYR4 |
| Chromium | 1.092 µg/L 1.1% of the EPA limit 100 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2017 | 1/2 | SYR4 |
| Tetrachloroethylene | 1.01 µg/L 20% of the EPA limit 5 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Selenium | 0.9000 µg/L 1.8% of the EPA limit 50 µg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2017 | 1/2 | SYR4 |
| Monobromoacetic Acid | 0.5380 µg/L No EPA limit set Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2019 | 1/2 | SYR4 |
| Styrene | 0.1800 µg/L 0.2% of the EPA limit 100 µg/L Highest in the city: BOARDWALK MHC LLC · 130 people · 2018 | 1/2 | SYR4 |
| Lead | 0.0082 mg/L 55% of the EPA limit 0.0150 mg/L Main supplier: MARSHFIELD UTILITIES · 18,815 people · 2025 | 2/2 | 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 Marshfield
| Supplier | Population served |
|---|---|
| MARSHFIELD UTILITIES | 18,815 |
| BOARDWALK MHC LLC | 130 |
Frequently asked questions about Marshfield tap water
Is Marshfield tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Marshfield. 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 Marshfield?
2 public water suppliers report drinking-water monitoring for Marshfield, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Marshfield's water?
The contaminants EPA monitoring detected in Marshfield include Nitrate-Nitrite, Nitrate, 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.