County · Massachusetts
Norfolk County, Massachusetts: drinking water records
This overview covers 40 ZIP codes and 42 community water systems in Norfolk County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Dedham Westwood Water Dist. MA3073000 | 41,630 | 240 | 4 | 1 | 2 ppb |
| Bellingham DPW Water Sewer Division MA2025000 | 16,556 | 120 | 3 | 6 | 3.6 ppb |
| Medfield Water Dept. MA2175000 | 12,713 | 180 | 5 | 1 | 7 ppb |
| Plainville Water Department MA4238000 | 8,805 | 240 | 4 | 8 | 2 ppb |
| Quincy Water Dept. (MWRA) MA3243000 | 106,000 | 120 | 0 | 0 | 8.7 ppb |
| Brookline Water and Sewer Division MA3046000 | 63,191 | 120 | 0 | 0 | 1.3 ppb |
| Weymouth Water Department MA4336000 | 57,871 | 180 | 1 | 0 | 1 ppb |
| Braintree Water and Sewer Dept. MA4040000 | 39,143 | 120 | 5 | 0 | 4.8 ppb |
| Randolph Water Department MA4244000 | 35,114 | 120 | 6 | 0 | 3 ppb |
| Franklin Water Department MA2101000 | 33,706 | 420 | 5 | 0 | 2 ppb |
| Needham Water Dept MA3199000 | 31,664 | 180 | 2 | 0 | 5 ppb |
| Norwood Water Dept. (MWRA) MA4220000 | 29,909 | 120 | 0 | 0 | 5 ppb |
| Wellesley Water Division MA3317000 | 29,550 | 300 | 6 | 0 | 3.5 ppb |
| Stoughton Water Department MA4285000 | 29,281 | 391 | 5 | 0 | 3 ppb |
| Milton Water Dept. (MWRA) MA3189000 | 28,630 | 120 | 0 | 0 | 7.7 ppb |
| Walpole Water Dept MA4307000 | 24,070 | 120 | 6 | 0 | 1.8 ppb |
| Canton Water Dept MA4050000 | 22,766 | 240 | 4 | 0 | 1.4 ppb |
| Foxboro Water Department MA4099000 | 18,721 | 180 | 5 | 0 | 0 ppb |
| Sharon Water Dept MA4266000 | 16,846 | 360 | 6 | 0 | 3 ppb |
| Medway Water Department MA2177000 | 14,176 | 120 | 4 | 0 | 0 ppb |
| Wrentham Water Division MA4350000 | 12,190 | 180 | 5 | 0 | 1 ppb |
| Holbrook Public Works Dept MA4133000 | 11,405 | 120 | 7 | 0 | 1 ppb |
| Millis Water Dept MA2187000 | 9,055 | 240 | 5 | 0 | 1.5 ppb |
| Norfolk Water Division MA2208000 | 7,602 | 240 | 5 | 0 | 0 ppb |
| Cohasset Water Dept MA4065000 | 7,555 | 120 | 5 | 0 | 2 ppb |
ZIP reports in Norfolk County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.