PFAS in tap water, York County, Pennsylvania
6 of 12 water systems had PFAS-4 above our 0.5 ng/L benchmark at the latest sample. Highest: Veolia Newberry System, 23.7 ng/L. 6 had PFOA or PFOS above the 4 ng/L federal MCL in at least one sample.
12 community water systems · 340,816 people served · newest sample January 12, 2026
Water systems in York County
| Water system | People served | PFAS-4 at the latest sample | Entry points | Latest sample |
|---|---|---|---|---|
| York Water CO | 206,762 | below the 3 to 4 ng/L reporting limit | 1 | November 12, 2025 |
| Hanover Muni Water Works | 40,900 | below the 3 to 4 ng/L reporting limit | 1 | December 5, 2023 |
| Dover TWP Water Sys | 21,097 | 12.2 ng/L above the 2029 federal MCL | 9 | February 20, 2025 |
| Red Lion Municipal Authority | 15,882 | below the 3 to 4 ng/L reporting limit | 1 | June 24, 2025 |
| Dallastown Yoe Water Auth | 12,300 | below the 3 to 4 ng/L reporting limit | 1 | February 10, 2025 |
| West Manchester TWP Auth | 9,960 | 20.7 ng/L above the 2029 federal MCL | 3 | January 12, 2026 |
| Dillsburg Area Authority | 8,962 | 12.8 ng/L above the 2029 federal MCL | 4 | July 19, 2023 |
| Veolia Newberry System | 6,480 | 23.7 ng/L above the 2029 federal MCL | 6 | January 28, 2025 |
| Stewartstown Boro Water Auth | 5,206 | 4.5 ng/L above the 2029 federal MCL | 5 | December 11, 2023 |
| Shrewsbury Borough | 4,727 | 18.3 ng/L above the 2029 federal MCL | 8 | November 20, 2023 |
| New Freedom Boro Water Auth | 4,464 | below the 3 to 4 ng/L reporting limit | 5 | April 9, 2024 |
| Wrightsville Boro Muni Auth | 4,076 | below the 3 to 4 ng/L reporting limit | 1 | November 18, 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.
ZIP codes in York 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.