What was found in Wrentham'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 | 2000 µg/L 20% of the EPA limit 10000 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019
Highest in the city: 3490 µg/L — WRENTHAM DEVELOPMENTAL CENTER · 937 people · 2019 | 3/3 | SYR4 |
| Copper | 18.5 µg/L 1.4% of the EPA limit 1300 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019
Highest in the city: 60 µg/L — MOUNT ST MARYS ABBEY · 60 people · 2019 | 2/3 | SYR4 |
| Barium | 29.76 µg/L 1.5% of the EPA limit 2000 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2018 | 1/3 | SYR4 |
| TTHM | 28.85 µg/L 36% of the EPA limit 80 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 2/3 | SYR4 |
| Chloroform | 9.82 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 8.71 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 8.57 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 6.17 µg/L 10% of the EPA limit 60 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019
Highest in the city: 6.355 µg/L — WRENTHAM DEVELOPMENTAL CENTER · 937 people · 2019 | 2/3 | SYR4 |
| Dichloroacetic Acid | 4.06 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Bromoform | 3.01 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 2.11 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| O-Dichlorobenzene | 1.38 µg/L 0.2% of the EPA limit 600 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Trichloroacetic Acid | 1.175 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Dalapon | 1 µg/L 0.5% of the EPA limit 200 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2018 | 1/3 | SYR4 |
| Tetrachloroethylene | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Thallium, Total | 1 µg/L 50% of the EPA limit 2 µg/L Highest in the city: WRENTHAM DEVELOPMENTAL CENTER · 937 people · 2019 | 1/3 | SYR4 |
| Monochloroacetic Acid | 0.8300 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2019 | 1/3 | SYR4 |
| Pentachlorophenol | 0.1000 µg/L 10% of the EPA limit 1 µg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2018 | 1/3 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2023
Highest in the city: 0.0060 mg/L — MOUNT ST MARYS ABBEY · 60 people · 2023 | 3/3 | LCR |
| PFBS | 0.0059 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2024 | 1/3 | UCMR-5 |
| PFOA | 0.0057 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2024 | 1/3 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2024 | 1/3 | UCMR-5 |
| Pfhxa | 0.0032 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2024 | 1/3 | UCMR-5 |
| Pfpea | 0.0031 µg/L No EPA limit set Main supplier: WRENTHAM WATER DIVISION · 12,190 people · 2024 | 1/3 | UCMR-5 |
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 Wrentham
| Supplier | Population served |
|---|---|
| WRENTHAM WATER DIVISION | 12,190 |
| WRENTHAM DEVELOPMENTAL CENTER | 937 |
| MOUNT ST MARYS ABBEY | 60 |
Frequently asked questions about Wrentham tap water
Is Wrentham tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Wrentham. 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 Wrentham?
3 public water suppliers report drinking-water monitoring for Wrentham, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Wrentham's water?
The contaminants EPA monitoring detected in Wrentham include Nitrate, Copper, Barium, TTHM, Chloroform. 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.