What was found in Marlborough'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 |
|---|---|---|---|
| Fluoride | 1000 µg/L 25% of the EPA limit 4000 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2016 | 1/1 | SYR4 |
| Nitrate | 400 µg/L 4% of the EPA limit 10000 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2016 | 1/1 | SYR4 |
| Copper | 68.2 µg/L 5.2% of the EPA limit 1300 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2016 | 1/1 | SYR4 |
| TTHM | 48 µg/L 60% of the EPA limit 80 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Barium | 36.8 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2016 | 1/1 | SYR4 |
| Lead | 26.6 µg/L 177% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2016 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 24.5 µg/L 41% of the EPA limit 60 µg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 13.65 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Chloroform | 9.86 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 4.295 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 3.1865 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 1.7755 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 0.9465 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 0.9095 µg/L No EPA limit set Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0033 mg/L 22% of the EPA limit 0.0150 mg/L Main supplier: MARLBOROUGH DPW WATER DIV. (MWRA) · 41,799 people · 2025 | 1/1 | LCR |
Water suppliers serving Marlborough
| Supplier | Population served |
|---|---|
| MARLBOROUGH DPW WATER DIV. (MWRA) | 41,799 |
Frequently asked questions about Marlborough tap water
Is Marlborough tap water safe to drink?
EPA testing detected 15 contaminants in the water serving Marlborough. 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 Marlborough?
1 public water supplier report drinking-water monitoring for Marlborough, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Marlborough's water?
The contaminants EPA monitoring detected in Marlborough include Fluoride, Nitrate, Copper, TTHM, 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.