PFAS in tap water, Westchester County, New York
6 of 27 water systems had PFAS-4 above our 0.5 ng/L benchmark at the latest sample. Highest: Yeshiva Farm Settlement, 190.4 ng/L. 6 had PFOA or PFOS above the 4 ng/L federal MCL in at least one sample.
27 community water systems · 967,892 people served · newest sample December 8, 2025
Water systems in Westchester County
| Water system | People served | PFAS-4 at the latest sample | Entry points | Latest sample |
|---|---|---|---|---|
| Yonkers City | 211,569 | below the 3 to 4 ng/L reporting limit | 2 | July 15, 2025 |
| Veolia Water New York, INC. Rd-1 | 146,732 | below the 3 to 4 ng/L reporting limit | 1 | May 20, 2025 |
| Greenburgh Consolidated WD #1 | 86,624 | below the 3 to 4 ng/L reporting limit | 1 | February 26, 2024 |
| Mount Vernon Water Department | 73,893 | below the 3 to 4 ng/L reporting limit | 2 | August 19, 2025 |
| Westchester Joint Water Works | 59,629 | below the 3 to 4 ng/L reporting limit | 2 | November 19, 2025 |
| White Plains City | 59,559 | below the 3 to 4 ng/L reporting limit | 2 | May 8, 2024 |
| Veolia Water New York, INC. Rd-2 | 57,301 | 4.7 ng/L above the 2029 federal MCL | 2 | August 26, 2025 |
| Yorktown Consold. Water Dist.#1 | 36,000 | 6 ng/L above the 2029 federal MCL | 2 | October 8, 2024 |
| Ossining Water Department | 30,000 | 4.3 ng/L above the 2029 federal MCL | 1 | January 17, 2024 |
| Cortlandt Consolidated WD | 28,369 | below the 3 to 4 ng/L reporting limit | 1 | May 20, 2025 |
| Peekskill City | 24,272 | below the 3 to 4 ng/L reporting limit | 1 | January 17, 2024 |
| Scarsdale Water Department | 21,649 | below the 3 to 4 ng/L reporting limit | 2 | April 9, 2024 |
| Kensico Water District | 17,917 | below the 3 to 4 ng/L reporting limit | 1 | December 9, 2024 |
| New Castle/Stanwood W.D. | 17,116 | below the 3 to 4 ng/L reporting limit | 1 | December 12, 2023 |
| Mount Kisco Water Department | 11,187 | below the 3 to 4 ng/L reporting limit | 2 | December 10, 2024 |
| Tarrytown Water Supply | 11,000 | below the 3 to 4 ng/L reporting limit | 1 | December 6, 2023 |
| Sleepy Hollow (Village) | 9,870 | below the 3 to 4 ng/L reporting limit | 1 | October 16, 2024 |
| Pleasantville Water District | 9,550 | below the 3 to 4 ng/L reporting limit | 1 | December 8, 2025 |
| Briarcliff Manor Village | 9,190 | below the 3 to 4 ng/L reporting limit | 1 | November 18, 2024 |
| Bedford Consolidated W.D. | 9,056 | 4.5 ng/L above the 2029 federal MCL | 2 | November 18, 2025 |
| Croton on Hudson Village | 8,000 | below the 3 to 4 ng/L reporting limit | 1 | December 11, 2024 |
| Irvington Water Supply | 6,631 | below the 3 to 4 ng/L reporting limit | 1 | December 11, 2023 |
| Larchmont Village | 6,485 | below the 3 to 4 ng/L reporting limit | 1 | October 16, 2023 |
| Westchester County WD #3 | 6,000 | below the 3 to 4 ng/L reporting limit | 1 | December 10, 2024 |
| Elmsford Village | 5,293 | below the 3 to 4 ng/L reporting limit | 1 | October 18, 2023 |
| Heritage Hills Water System | 4,700 | 12.7 ng/L above the 2029 federal MCL | 1 | August 19, 2024 |
| Yeshiva Farm Settlement | 300 | 190.4 ng/L above the 2029 federal MCL | 1 | October 24, 2023 |
| Pequenakonck Elementary School non-transient non-community water system | 700 | monitored under UCMR 5, no page | ||
| Somers Town House/Hall non-transient non-community water system | 32 | monitored under UCMR 5, no page | ||
2 systems without a page are not a community water system (schools, workplaces, campgrounds). Nobody's home tap water.
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
- Ardsley
- Bedford town/township
- Briarcliff Manor
- Bronxville
- Cortlandt town/township
- Croton-on-Hudson
- Dobbs Ferry
- Eastchester town/township
- Elmsford
- Greenburgh town/township
- Hastings-on-Hudson
- Irvington
- Larchmont
- Mount Kisco
- Mount Pleasant town/township
- Mount Vernon
- New Castle town/township
- New Rochelle
- Ossining town/township
- Peekskill
- Pelham
- Pelham Manor
- Port Chester
- Rye town/township
- Rye Brook
- Somers town/township
- Tarrytown
- Tuckahoe
- White Plains
- Yonkers
- Yorktown town/township
ZIP codes in Westchester 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.