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Updated 2026-10-15
County water report

Westchester County Water Quality: 12 Cities Ranked by the Records

Westchester County, New York: 12 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Westchester County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanoic acid (PFOA)Detected in 2 systems of 12 tested4.0 ng/L federal MCL (2024) · US EPAHighest6.5 ng/L
LithiumDetected in 1 system of 12 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest13.6 µg/L
Lead (90th percentile)Detected in 12 systems15 µg/L federal action level · US EPAHighest12.2 µg/L
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 12 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest3.8 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 2 systems of 12 testedNo federal or state limit; shown for transparencyHighest3.7 ng/L
26 PFAS tested, none detected in any systemShow

Tested in these 12 systems: MOUNT KISCO WATER DEPARTMENT, MOUNT VERNON WATER DEPARTMENT, OSSINING WATER DEPARTMENT, PEEKSKILL CITY, SCARSDALE WATER DEPARTMENT, SLEEPY HOLLOW (VILLAGE), TARRYTOWN WATER SUPPLY, VEOLIA WATER NEW YORK, INC. RD-1, VEOLIA WATER NEW YORK, INC. RD-2, WESTCHESTER JOINT WATER WORKS, WHITE PLAINS CITY, YONKERS CITY

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanesulfonic acid (PFBS)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
12 cities

Cities ranked by the records

Showing 6 of 12 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Westchester County2 of 12 city reports had a PFAS sample above a 2024 EPA limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in New York
Lead

0of 12 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in New York
Who supplies the county

Largest water systems

  1. YonkersYONKERS CITY · NY5903465
    211,569 served
  2. New RochelleVEOLIA WATER NEW YORK, INC. RD-1 · NY5903444
    146,732 served
  3. Mount VernonMOUNT VERNON WATER DEPARTMENT · NY5903441
    73,893 served
  4. HarrisonWESTCHESTER JOINT WATER WORKS · NY5903435
    59,629 served
  5. White PlainsWHITE PLAINS CITY · NY5903464
    59,559 served
  6. Port ChesterVEOLIA WATER NEW YORK, INC. RD-2 · NY5903456
    57,301 served
  7. OssiningOSSINING WATER DEPARTMENT · NY5903451
    30,000 served
  8. PeekskillPEEKSKILL CITY · NY5903452
    24,272 served
  9. ScarsdaleSCARSDALE WATER DEPARTMENT · NY5903457
    21,649 served
  10. Mount KiscoMOUNT KISCO WATER DEPARTMENT · NY5903437
    11,187 served
Questions

Frequently asked

How does Westchester County tap water compare across cities?

PurityMap ranks 12 cities in Westchester County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is White Plains's main water system: WHITE PLAINS CITY · PWSID NY5903464 · Purity Score 99 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Westchester County cities had a PFAS sample above a 2024 EPA limit?

2 of 12 Westchester County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Port Chester (PFOA 6.5 ng/L), Ossining (PFOA 4.3 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 3.

Is there lead in Westchester County tap water?

Utilities report lead as a 90th-percentile result from home taps. 12 of 12 Westchester County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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