What was found in Dedham'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 | 1460 µg/L 15% of the EPA limit 10000 µg/L Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Fluoride | 957.5 µg/L 24% of the EPA limit 4000 µg/L Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2018 | 1/1 | SYR4 |
| Copper | 384 µg/L 30% of the EPA limit 1300 µg/L Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| TTHM | 76.415 µg/L 96% of the EPA limit 80 µg/L Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Chloroform | 48.73 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 41.26 µg/L 69% of the EPA limit 60 µg/L Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 28.055 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 21.84 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 20.265 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 14.7 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Bromoform | 9.32 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 8.7 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 4.91 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2019 | 1/1 | SYR4 |
| Asbestos | 1 MFL 14% of the EPA limit 7 MFL Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2016 | 1/1 | SYR4 |
| PFOA | 0.0065 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0059 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2025 | 1/1 | UCMR-5 |
| PFOS | 0.0051 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0041 µg/L No EPA limit set Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: DEDHAM WESTWOOD WATER DIST. · 41,630 people · 2025 | 1/1 | LCR |
Water suppliers serving Dedham
| Supplier | Population served |
|---|---|
| DEDHAM WESTWOOD WATER DIST. | 41,630 |
Frequently asked questions about Dedham tap water
Is Dedham tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Dedham. 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 Dedham?
1 public water supplier report drinking-water monitoring for Dedham, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Dedham's water?
The contaminants EPA monitoring detected in Dedham include Nitrate, Fluoride, Copper, 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.