PlainWater
Counties → New York

Westchester County, New York

Water Systems
274
Population Served
992,853
Total Violations
15,832
1,136 health-based
PFAS Detected
9
of 29 tested

Violation Analysis

92.3%
Systems with Violations
57.8
Avg Violations per System
7.2%
Health-Based Violations

Water Source Types

SW
31 systems (11%)
GW
19 systems (7%)

PFAS Contamination

29
Systems Tested
9
PFAS Detected
31.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Westchester New York water systems by violation status, EPA SDWIS records.

No violations on record (4) One or more violations (46)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

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 -

Other Counties in New York

Richmond County
1 systems · 8,271,000 served · 47 violations
Suffolk County
152 systems · 1,387,905 served · 3,402 violations
Nassau County
44 systems · 1,387,489 served · 7,471 violations
Erie County
108 systems · 955,615 served · 7,606 violations
Onondaga County
88 systems · 615,889 served · 2,561 violations
Orleans County
23 systems · 535,814 served · 437 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Westchester County? ▼
Westchester County has 15,832 total drinking water violations across 274 water systems, of which 1,136 are health-based violations. 92.3% of systems have at least one violation.
How many people get water from Westchester County systems? ▼
Water systems in Westchester County serve approximately 992,853 people through 274 public water systems.
Has PFAS been detected in Westchester County water? ▼
Of 29 water systems tested for PFAS in Westchester County, 9 had PFAS detected (31.0% detection rate).
What types of water sources supply Westchester County? ▼
Water systems in Westchester County use SW (31 systems), GW (19 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 7.2% of Westchester County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - 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 Editorial

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.