County · New York
Westchester County, New York: drinking water records
This overview covers 74 ZIP codes and 90 community water systems in Westchester County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Westchester Joint Water Works NY5903435 | 59,629 | 240 | 0 | 3 | 3.3 ppb |
| Yorktown Consold. Water Dist.#1 NY5903469 | 36,000 | 240 | 4 | 4 | 1.2 ppb |
| Kensico Water District NY5930082 | 17,917 | 120 | 0 | 6 | 2.4 ppb |
| Mount Kisco Water Department NY5903437 | 11,187 | 180 | 1 | 1 | 1 ppb |
| Tarrytown Water Supply NY5903461 | 11,000 | 120 | 0 | 3 | 4.4 ppb |
| Westchester County WD #3 NY5903482 | 6,000 | 120 | 0 | 2 | 0 ppb |
| Yonkers City NY5903465 | 211,569 | 240 | 0 | 0 | 4.3 ppb |
| Veolia Water New York, INC. Rd-1 NY5903444 | 146,732 | 120 | 0 | 0 | 5 ppb |
| Greenburgh Consolidated WD #1 NY5903429 | 86,624 | 120 | 0 | 0 | 1.3 ppb |
| Mount Vernon Water Department NY5903441 | 73,893 | 240 | 0 | 0 | 2.5 ppb |
| White Plains City NY5903464 | 59,559 | 240 | 0 | 0 | 1.3 ppb |
| Veolia Water New York, INC. Rd-2 NY5903456 | 57,301 | 240 | 3 | 0 | 2 ppb |
| Ossining Water Department NY5903451 | 30,000 | 120 | 1 | 0 | 3 ppb |
| Cortlandt Consolidated WD NY5903423 | 28,369 | 120 | 0 | 0 | 0 ppb |
| Peekskill City NY5903452 | 24,272 | 120 | 0 | 0 | 1.3 ppb |
| Scarsdale Water Department NY5903457 | 21,649 | 240 | 0 | 0 | 6.2 ppb |
| New Castle/Stanwood W.D. NY5903442 | 17,116 | 120 | 0 | 0 | 0 ppb |
| Sleepy Hollow (Village) NY5903450 | 9,870 | 120 | 0 | 0 | 0 ppb |
| Pleasantville Water District NY5903455 | 9,550 | 120 | 0 | 0 | 0 ppb |
| Briarcliff Manor Village NY5903420 | 9,190 | 120 | 0 | 0 | 3.2 ppb |
| Bedford Consolidated W.D. NY5903419 | 9,056 | 240 | 2 | 0 | 2 ppb |
| Croton on Hudson Village NY5903425 | 8,000 | 60 | 0 | 0 | 0 ppb |
| Irvington Water Supply NY5903432 | 6,631 | 120 | 0 | 0 | 1 ppb |
| Larchmont Village NY5903433 | 6,485 | 120 | 0 | 0 | 6 ppb |
| Elmsford Village NY5903427 | 5,293 | 120 | 0 | 0 | 1.8 ppb |
ZIP reports in Westchester County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 10501, 10596.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.