What was found in Billerica'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 | 1130 µg/L 28% of the EPA limit 4000 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Nitrate | 710 µg/L 7.1% of the EPA limit 10000 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Nitrite | 205 µg/L 21% of the EPA limit 1000 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| TTHM | 50.9 µg/L 64% of the EPA limit 80 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Barium | 32.5 µg/L 1.6% of the EPA limit 2000 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Chloroform | 26 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 24.625 µg/L 41% of the EPA limit 60 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 18.815 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 18.1 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Cyanide | 16 µg/L 8% of the EPA limit 200 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 13.61 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Bromate | 9.73 µg/L 97% of the EPA limit 10 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Dichloromethane | 7.6 µg/L 152% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 6.475 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 6.2 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Bromoform | 3.98 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 3.4 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Chromium | 2.26 µg/L 2.3% of the EPA limit 100 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Arsenic | 1.7 µg/L 17% of the EPA limit 10 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Selenium | 1.5 µg/L 3% of the EPA limit 50 µg/L Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.03 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2019 | 1/1 | SYR4 |
| Pfpea | 0.0080 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0061 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2025 | 1/1 | UCMR-5 |
| Pfba | 0.0055 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2025 | 1/1 | UCMR-5 |
| PFOA | 0.0055 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0031 µg/L No EPA limit set Main supplier: BILLERICA WATER WORKS · 42,119 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: BILLERICA WATER WORKS · 42,119 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 Billerica
| Supplier | Population served |
|---|---|
| BILLERICA WATER WORKS | 42,119 |
Frequently asked questions about Billerica tap water
Is Billerica tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Billerica. 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 Billerica?
1 public water supplier report drinking-water monitoring for Billerica, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Billerica's water?
The contaminants EPA monitoring detected in Billerica include Fluoride, Nitrate, Nitrite, 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.