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Counties → New York

Westchester County, New York

SDWIS compliance plate

Sheet NY119 · Westchester County 274 sys · 15,832 viol · #55/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 92.3% flagged
  • HEALTH-LOW 7.2% health
  • RANK-TOP #55/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-MID 31.0% detect
  • SRC-GW GW lead 74%
  • SYS-LARGE 274 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Wyoming County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Westchester County ranks #55 of 3,254 counties by people served, and #4 of 58 counties in New York. See methodology · corpus placement.

Westchester County standing, lower-flagged corpus third

Flagged-system rate 92.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 7.2% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 31.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #55 of 3,254 · #4 of 58 in New York.

Flagged-rate neighbourhood around Westchester County

Lowest/highest poles plus in-state counties nearest Westchester County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Niagara · lowest Westchester · this county Erie · near Cortland · highest 38.1% 92% 92.3% 92.3% 92.6% 92.8% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Yonkers City 211,569 17 Clean
Veolia Water New York, Inc. RD-1 146,732 101 Clean
Mount Vernon Water Department 73,893 5 Clean
Westchester Joint Water Works 59,629 66 Clean
White Plains City 59,559 11 Clean
Veolia Water New York, Inc. RD-2 57,301 8 Detected
Greenburgh Consolidated WD #1 39,993 28 Clean
Yorktown Consold. Water Dist.#1 36,000 60 Detected
Ossining Water Department 30,000 311 Detected
Cortlandt Consolidated WD 28,369 102 Clean
Peekskill City 24,272 153 Clean
Scarsdale Water Department 21,649 0 Clean
Kensico Water District 17,917 58 Clean
New Castle/Stanwood W.D. 17,116 105 Clean
Mount Kisco Water Department 11,187 46 Detected
Tarrytown Water Supply 11,000 104 Clean
Sleepy Hollow (Village) 9,870 86 Clean
Pleasantville Water District 9,550 45 Clean
Briarcliff Manor Village 9,190 98 Clean
Bedford Consolidated W.D. 9,056 23 Detected
Croton on Hudson Village 8,000 79 Clean
Irvington Water Supply 6,631 47 Clean
Larchmont Village 6,485 18 Clean
Westchester County WD #3 6,000 318 Clean
Elmsford Village 5,293 33 Clean
Heritage Hills Water System 4,700 645 Detected
Somers Consolidated Water District #1 3,848 0 -
Montrose Improvement District 3,100 28 -
Fox Lane High & Middle Schools 3,000 26 -
Pace University 2,753 21 -
North Castle Water District #1 2,500 12 -
Buchanan Village 2,200 33 -
Old Farm Hill Water District 1,768 24 -
Old Post Road Water District 1,500 22 -
John Jay Senior High School 1,425 154 -
North Castle Water District #4 1,225 60 -
North Castle Water District #2 1,200 47 -
Somers High School 1,189 2 -
Bedford Rest Area Nys Rt 684 1,000 30 -
Saint Joseph Church (New) 1,000 0 -
Greenbriar Subdivision 956 596 -
John Jay Middle School 945 188 -
Primrose School 900 6 -
Seven-Eleven Store 900 0 -
Oakridge Water District 892 102 -
John F Kennedy High School 840 37 -
Wild Oaks Water Company 805 55 -
Byram Hills High School 800 436 -
Swiss Re of America 800 224 -
Somers Middle School 790 16 -

Compare beyond New York

Lower-flagged peers for Westchester County

Cross-state counties nearest Westchester County on flagged-system share (92.3%) and cumulative violation count (15,832). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.