What was found in Plymouth'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 | 4887 µg/L 49% of the EPA limit 10000 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2018 | 4/4 | SYR4 |
| Nitrate-Nitrite | 4872 µg/L 49% of the EPA limit 10000 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 4/4 | SYR4 |
| Copper | 867.4 µg/L 67% of the EPA limit 1300 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2017
Highest in the city: 1128.5 µg/L — ROCKY KNOLL HEALTH CARE FAC · 564 people · 2017 | 4/4 | SYR4 |
| Fluoride | 940.1 µg/L 24% of the EPA limit 4000 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2017 | 3/4 | SYR4 |
| TTHM | 58.497 µg/L 73% of the EPA limit 80 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019
Highest in the city: 86.052 µg/L — LAKELAND UNIVERSITY · 1,200 people · 2019 | 4/4 | SYR4 |
| Barium | 55.885 µg/L 2.8% of the EPA limit 2000 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2017
Highest in the city: 78.25 µg/L — KETTLE MORAINE CORRECTIONAL INSTITUTION · 1,544 people · 2017 | 4/4 | SYR4 |
| Chloroform | 46.8 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019
Highest in the city: 72.2 µg/L — LAKELAND UNIVERSITY · 1,200 people · 2019 | 4/4 | SYR4 |
| Lead | 23.335 µg/L 156% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2017 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7.58 µg/L 13% of the EPA limit 60 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019
Highest in the city: 17.6005 µg/L — LAKELAND UNIVERSITY · 1,200 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 10.52 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 4/4 | SYR4 |
| Gross Beta Particle Activity | 10.3985 pCi/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2018 | 1/4 | SYR4 |
| Dichloroacetic Acid | 3.9 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019
Highest in the city: 9.084 µg/L — LAKELAND UNIVERSITY · 1,200 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 7.5185 µg/L No EPA limit set Highest in the city: LAKELAND UNIVERSITY · 1,200 people · 2019 | 2/4 | SYR4 |
| Arsenic | 3.873 µg/L 39% of the EPA limit 10 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2017
Highest in the city: 5.8 µg/L — LAKELAND UNIVERSITY · 1,200 people · 2018 | 3/4 | SYR4 |
| Dibromochloromethane | 4.24 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 3.9 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.86 pCi/L 26% of the EPA limit 15 pCi/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 3/4 | SYR4 |
| Combined Radium (-226 And -228) | 2.0492 pCi/L 41% of the EPA limit 5 pCi/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019
Highest in the city: 3.237 pCi/L — ROCKY KNOLL HEALTH CARE FAC · 564 people · 2017 | 4/4 | SYR4 |
| Bromoform | 1.192 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019 | 4/4 | SYR4 |
| Combined Uranium | 0.8630 µg/L 2.9% of the EPA limit 30 µg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2019
Highest in the city: 0.9350 µg/L — LAKELAND UNIVERSITY · 1,200 people · 2018 | 2/4 | SYR4 |
| Selenium | 0.8950 µg/L 1.8% of the EPA limit 50 µg/L Highest in the city: ROCKY KNOLL HEALTH CARE FAC · 564 people · 2017 | 1/4 | SYR4 |
| Monobromoacetic Acid | 0.4900 µg/L No EPA limit set Highest in the city: LAKELAND UNIVERSITY · 1,200 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0062 mg/L 41% of the EPA limit 0.0150 mg/L Main supplier: PLYMOUTH UTILITIES · 8,964 people · 2023
Highest in the city: 0.0218 mg/L — LAKELAND UNIVERSITY · 1,200 people · 2025 | 4/4 | 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 Plymouth
| Supplier | Population served |
|---|---|
| PLYMOUTH UTILITIES | 8,964 |
| KETTLE MORAINE CORRECTIONAL INSTITUTION | 1,544 |
| LAKELAND UNIVERSITY | 1,200 |
| ROCKY KNOLL HEALTH CARE FAC | 564 |
Frequently asked questions about Plymouth tap water
Is Plymouth tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Plymouth. 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 Plymouth?
4 public water suppliers report drinking-water monitoring for Plymouth, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Plymouth's water?
The contaminants EPA monitoring detected in Plymouth include Nitrate, Nitrate-Nitrite, Copper, Fluoride, TTHM. 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.