What was found in Woburn'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 | 844.05 µg/L 21% of the EPA limit 4000 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Nitrate | 620 µg/L 6.2% of the EPA limit 10000 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| TTHM | 64.13499999999999 µg/L 80% of the EPA limit 80 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Copper | 59.0499999999999 µg/L 4.5% of the EPA limit 1300 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Barium | 38.89999999999998 µg/L 1.9% of the EPA limit 2000 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Chloroform | 21.869999999999994 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 20.665 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 19.7 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 13.85 µg/L 23% of the EPA limit 60 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 10.2 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Bromoform | 8.657999999999996 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Nitrite | 6.4 µg/L 0.6% of the EPA limit 1000 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Chromium | 5.704999999999995 µg/L 5.7% of the EPA limit 100 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 5.2135 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 3.4069999999999983 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 3.205 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Selenium | 1.6 µg/L 3.2% of the EPA limit 50 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Arsenic | 1.5849999999999995 µg/L 16% of the EPA limit 10 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 0.7000 µg/L 14% of the EPA limit 5 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Thallium, Total | 0.1240 µg/L 6.2% of the EPA limit 2 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Cadmium | 0.1100 µg/L 2.2% of the EPA limit 5 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| Mercury | 0.0370 µg/L 1.9% of the EPA limit 2 µg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2019 | 1/1 | SYR4 |
| PFOA | 0.0084 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | UCMR-5 |
| Pfba | 0.0070 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | UCMR-5 |
| PFOS | 0.0069 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0038 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0037 µg/L No EPA limit set Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0013 mg/L 8.5% of the EPA limit 0.0150 mg/L Main supplier: WOBURN WATER DEPT. · 40,876 people · 2025 | 1/1 | 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 Woburn
| Supplier | Population served |
|---|---|
| WOBURN WATER DEPT. | 40,876 |
Frequently asked questions about Woburn tap water
Is Woburn tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Woburn. 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 Woburn?
1 public water supplier report drinking-water monitoring for Woburn, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Woburn's water?
The contaminants EPA monitoring detected in Woburn include Fluoride, Nitrate, TTHM, 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.