PFAS in tap water, Hampshire County, Massachusetts
1 of 10 water systems had PFAS-4 above our 0.5 ng/L benchmark at the latest sample. Highest: Ware Water Dept, 5.7 ng/L. 1 had PFOA or PFOS above the 4 ng/L federal MCL in at least one sample.
10 community water systems · 132,200 people served · newest sample November 5, 2025
Water systems in Hampshire County
| Water system | People served | PFAS-4 at the latest sample | Entry points | Latest sample |
|---|---|---|---|---|
| Amherst DPW Water Division | 39,263 | below the 3 to 4 ng/L reporting limit | 5 | June 12, 2024 |
| Northampton Water Division | 29,571 | below the 3 to 4 ng/L reporting limit | 3 | September 4, 2024 |
| Easthampton Water Dept | 16,211 | below the 3 to 4 ng/L reporting limit | 4 | January 10, 2025 |
| South Hadley FD #1 (MWRA) | 14,800 | below the 3 to 4 ng/L reporting limit | 1 | October 16, 2024 |
| Ware Water Dept | 10,066 | 5.7 ng/L above the 2029 federal MCL | 2 | September 10, 2025 |
| South Hadley Fire District #2 Water Dept | 6,200 | below the 3 to 4 ng/L reporting limit | 2 | November 5, 2025 |
| Southampton Water Dept | 4,853 | below the 3 to 4 ng/L reporting limit | 2 | November 6, 2024 |
| Hadley DPW Water Division | 4,819 | below the 3 to 4 ng/L reporting limit | 2 | September 9, 2025 |
| Belchertown Water District | 3,253 | below the 3 to 4 ng/L reporting limit | 2 | September 11, 2023 |
| Hatfield Water Dept | 3,164 | below the 3 to 4 ng/L reporting limit | 3 | November 4, 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
ZIP codes in Hampshire 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.