PFAS in tap water, Norfolk County, Massachusetts
18 of 27 water systems had PFAS-4 above our 0.5 ng/L benchmark at the latest sample. Highest: Sharon Water Dept, 25.2 ng/L. 20 had PFOA or PFOS above the 4 ng/L federal MCL in at least one sample.
27 community water systems · 715,126 people served · newest sample May 28, 2026
Water systems in Norfolk County
| Water system | People served | PFAS-4 at the latest sample | Entry points | Latest sample |
|---|---|---|---|---|
| Quincy Water Dept. (MWRA) | 106,000 | below the 3 to 4 ng/L reporting limit | 1 | October 22, 2024 |
| Brookline Water and Sewer Division | 63,191 | below the 3 to 4 ng/L reporting limit | 1 | October 7, 2024 |
| Weymouth Water Department | 57,871 | below the 3 to 4 ng/L reporting limit | 2 | February 11, 2025 |
| Dedham Westwood Water Dist. | 41,630 | 11.1 ng/L above the 2029 federal MCL | 3 | October 16, 2025 |
| Braintree Water and Sewer Dept. | 39,143 | 12.7 ng/L above the 2029 federal MCL | 1 | March 19, 2024 |
| Randolph Water Department | 35,114 | 19.8 ng/L above the 2029 federal MCL | 1 | August 12, 2024 |
| Franklin Water Department | 33,706 | below the 3 to 4 ng/L reporting limit above the 2029 federal MCL in an earlier sample | 7 | June 17, 2025 |
| Needham Water Dept | 31,664 | 4 ng/L above the 2029 federal MCL | 2 | October 15, 2024 |
| Norwood Water Dept. (MWRA) | 29,909 | below the 3 to 4 ng/L reporting limit | 1 | October 16, 2024 |
| Wellesley Water Division | 29,550 | 12.8 ng/L above the 2029 federal MCL | 4 | October 1, 2025 |
| Stoughton Water Department | 29,281 | 14.3 ng/L above the 2029 federal MCL | 6 | May 28, 2026 |
| Milton Water Dept. (MWRA) | 28,630 | below the 3 to 4 ng/L reporting limit | 1 | October 16, 2024 |
| Walpole Water Dept | 24,070 | 8 ng/L | 2 | March 11, 2024 |
| Canton Water Dept | 22,766 | 4.9 ng/L above the 2029 federal MCL | 3 | October 16, 2024 |
| Foxboro Water Department | 18,721 | 13 ng/L above the 2029 federal MCL | 3 | September 3, 2025 |
| Sharon Water Dept | 16,846 | 25.2 ng/L above the 2029 federal MCL | 6 | May 21, 2025 |
| Bellingham DPW Water Sewer Division | 16,556 | below the 3 to 4 ng/L reporting limit above the 2029 federal MCL in an earlier sample | 2 | March 28, 2025 |
| Medway Water Department | 14,176 | 5.5 ng/L above the 2029 federal MCL | 2 | November 4, 2025 |
| Medfield Water Dept. | 12,713 | 13.5 ng/L above the 2029 federal MCL | 3 | September 24, 2024 |
| Wrentham Water Division | 12,190 | below the 3 to 4 ng/L reporting limit above the 2029 federal MCL in an earlier sample | 3 | February 7, 2024 |
| Holbrook Public Works Dept | 11,405 | 17 ng/L above the 2029 federal MCL | 1 | August 25, 2025 |
| Millis Water Dept | 9,055 | 13.7 ng/L above the 2029 federal MCL | 4 | January 22, 2024 |
| Plainville Water Department | 8,805 | 10.2 ng/L above the 2029 federal MCL | 2 | November 8, 2023 |
| Norfolk Water Division | 7,602 | 11.5 ng/L above the 2029 federal MCL | 4 | July 7, 2025 |
| Cohasset Water Dept | 7,555 | 4.6 ng/L above the 2029 federal MCL | 1 | December 2, 2025 |
| Town of Avon | 4,777 | 11.1 ng/L above the 2029 federal MCL | 2 | November 8, 2023 |
| Mci Norfolk/Cedar Junction/Walpole | 2,200 | below the 3 to 4 ng/L reporting limit | 1 | October 8, 2024 |
Not sure which one is yours? The systems report their own service areas to EPA. Check your water bill or your utility's Consumer Confidence Report.
Cities and towns
- Avon town/township
- Bellingham
- Braintree
- Brookline
- Canton town/township
- Cohasset town/township
- Dedham
- Foxborough
- Franklin
- Holbrook
- Medfield
- Medway town/township
- Millis town/township
- Milton
- Needham
- Norfolk town/township
- Norwood
- Plainville town/township
- Quincy
- Randolph
- Sharon
- Stoughton town/township
- Walpole
- Wellesley
- Weymouth
- Wrentham town/township
ZIP codes in Norfolk County
Census ZIP code tabulation areas that overlap the county. A ZIP served by one system opens that system's page; a ZIP shared by several systems lists them.
How to read these numbers
We compare PFAS-4 (PFOA + PFOS + PFNA + PFHxS) with this site's 0.5 ng/L benchmark, the same line as on the European pages. UCMR 5 reporting limits are 3 to 4 ng/L. So any quantified PFAS-4 compound is above the benchmark, and a clean result reads "below the 3 to 4 ng/L reporting limit", never zero. The US legal limit is the 4 ng/L federal MCL for PFOA and PFOS, which systems must meet from April 26, 2029 ("above the 2029 federal MCL").
EPA: "UCMR 5 results do not indicate compliance or noncompliance with the PFAS drinking water standards". Samples are taken where water enters the distribution system, not at your tap. A system may have changed sources or added treatment since. Source: U.S. Environmental Protection Agency (EPA), Office of Water, PFAS National Primary Drinking Water Regulation (NPDWR). Regulation details retrieved September 19, 2026. Every system page tracks the 2029 compliance date and the proposed rescission of the PFHxS, PFNA, HFPO-DA and Hazard Index limits.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.