What was found in ZIP 02557
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2360 µg/L 24% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Fluoride | 1010 µg/L 25% of the EPA limit 4000 µg/L | 1/1 | SYR4 |
| Copper | 71 µg/L 5.5% of the EPA limit 1300 µg/L | 1/1 | SYR4 |
| Barium | 38 µg/L 1.9% of the EPA limit 2000 µg/L | 1/1 | SYR4 |
| TTHM | 9.75 µg/L 12% of the EPA limit 80 µg/L | 1/1 | SYR4 |
| Bromoform | 2.95 µg/L No EPA limit set | 1/1 | SYR4 |
| Dibromochloromethane | 2.52 µg/L No EPA limit set | 1/1 | SYR4 |
| Chloroform | 1.96 µg/L No EPA limit set | 1/1 | SYR4 |
| Tetrachloroethylene | 1.9 µg/L 38% of the EPA limit 5 µg/L | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.56 µg/L 2.6% of the EPA limit 60 µg/L | 1/1 | SYR4 |
| Bromodichloromethane | 1.49 µg/L No EPA limit set | 1/1 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L | 1/1 | SYR4 |
| Pfhxa | 0.0040 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfpea | 0.0040 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Lead | 0.0039 mg/L 26% of the EPA limit 0.0150 mg/L | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 02557
| Supplier | State | Population served |
|---|---|---|
| OAK BLUFFS WATER DISTRICT | MA | 24,000 |
Frequently asked questions about ZIP 02557 tap water
Is the tap water in ZIP 02557 safe to drink?
EPA testing detected 15 contaminants across the water suppliers serving ZIP 02557. 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 02557?
1 public water supplier report EPA drinking-water monitoring for ZIP 02557. Each is listed above with its population served.
What contaminants are in ZIP 02557's water?
EPA monitoring detected Nitrate, Fluoride, Copper, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.