What was found in ZIP 01866
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the 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.
Water suppliers serving ZIP 01866
| Supplier | State | Population served |
|---|---|---|
| BILLERICA WATER WORKS | MA | 42,119 |
Frequently asked questions about ZIP 01866 tap water
Is the tap water in ZIP 01866 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 01866. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 01866?
1 public water supplier report EPA drinking-water monitoring for ZIP 01866. Each is listed above with its population served.
What contaminants are in ZIP 01866's water?
EPA monitoring detected Fluoride, Nitrate, Nitrite, TTHM, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.