PFAS in tap water, Plymouth County, Massachusetts
14 of 24 water systems had PFAS-4 above our 0.5 ng/L benchmark at the latest sample. Highest: Duxbury Water Department, 67.6 ng/L. 14 had PFOA or PFOS above the 4 ng/L federal MCL in at least one sample.
24 community water systems · 537,395 people served · newest sample December 2, 2025
Water systems in Plymouth County
| Water system | People served | PFAS-4 at the latest sample | Entry points | Latest sample |
|---|---|---|---|---|
| Brockton Water Department | 105,788 | below the 3 to 4 ng/L reporting limit | 1 | December 6, 2023 |
| Plymouth Water Department | 47,100 | below the 3 to 4 ng/L reporting limit | 11 | July 30, 2024 |
| Weir River Water System | 45,339 | 6.4 ng/L above the 2029 federal MCL | 2 | August 18, 2025 |
| Marshfield Water Department | 34,000 | 6.8 ng/L above the 2029 federal MCL | 16 | March 19, 2025 |
| Abington/Rockland Joint Wtr. Works | 33,387 | 23 ng/L above the 2029 federal MCL | 3 | February 6, 2025 |
| Mattapoisett River Valley W.D. | 29,600 | below the 3 to 4 ng/L reporting limit | 2 | September 23, 2024 |
| Bridgewater Water Department | 28,633 | 18 ng/L above the 2029 federal MCL | 3 | December 13, 2023 |
| Wareham Fire District | 20,102 | below the 3 to 4 ng/L reporting limit | 2 | January 13, 2025 |
| Scituate Water Division | 19,297 | 10.4 ng/L above the 2029 federal MCL | 4 | July 18, 2024 |
| Pembroke Water Division DPW | 18,175 | below the 3 to 4 ng/L reporting limit | 3 | September 30, 2024 |
| Duxbury Water Department | 16,387 | 67.6 ng/L above the 2029 federal MCL | 8 | May 6, 2025 |
| Middleborough Water Supply | 15,350 | 18 ng/L above the 2029 federal MCL | 10 | June 2, 2025 |
| Hanover Water Dept | 14,984 | 4.4 ng/L above the 2029 federal MCL | 3 | April 11, 2024 |
| Whitman Water System | 14,947 | below the 3 to 4 ng/L reporting limit | 1 | November 12, 2024 |
| Kingston Water Department | 14,715 | below the 3 to 4 ng/L reporting limit | 5 | October 28, 2024 |
| East Bridgewater Water Dept | 14,526 | 5.1 ng/L above the 2029 federal MCL | 2 | August 11, 2025 |
| Norwell Water Department | 11,495 | 12 ng/L above the 2029 federal MCL | 3 | February 26, 2024 |
| Hanson Water Department | 9,612 | 9.6 ng/L above the 2029 federal MCL | 1 | September 17, 2025 |
| Aquarion Water Company, Pinehills | 9,478 | below the 3 to 4 ng/L reporting limit | 1 | November 13, 2023 |
| West Bridgewater Water Dept | 7,709 | 5.5 ng/L above the 2029 federal MCL | 4 | December 2, 2024 |
| Mattapoisett Water Department | 7,685 | below the 3 to 4 ng/L reporting limit | 1 | August 7, 2023 |
| Halifax Water Department | 7,575 | 17.9 ng/L above the 2029 federal MCL | 4 | November 18, 2025 |
| Marion Water Division | 6,119 | below the 3 to 4 ng/L reporting limit | 1 | November 12, 2024 |
| Onset Fire Districtwater Dept. | 5,392 | 5.2 ng/L above the 2029 federal MCL | 4 | December 2, 2025 |
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
- Abington
- Bridgewater
- Brockton
- Duxbury
- East Bridgewater town/township
- Halifax town/township
- Hanover town/township
- Hanson
- Hingham
- Kingston
- Marion town/township
- Marshfield
- Mattapoisett town/township
- Middleborough town/township
- Norwell town/township
- Pembroke town/township
- Plymouth
- Scituate
- Wareham town/township
- West Bridgewater town/township
- Whitman town/township
ZIP codes in Plymouth 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.