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Community Water System · PWS PA1150834

Westtown School

West Chester, Pennsylvania 19382 - drinking water served from groundwater sources to 900 people, tracked in EPA SDWIS and UCMR5.

900
People served
651
EPA violations
11
Health-based
Untested
UCMR5 result

The verdict

EPA records 651 drinking-water violations at Westtown School, 2% of them health-based - above the Pennsylvania per-system average.

651
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
900
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Westtown School

Westtown School is a public/private-owned community water system that delivers drinking water to 900 residents in West Chester, Pennsylvania (Chester County) through 28 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 651 total violations for this system , of which 11 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 614 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Nitrate, recorded in 28 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Pennsylvania, EPA tracks 7,701 public water systems serving 12,630,061 people, with 1,159,868 cumulative violations and 68,517 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 150.6 violations. Statewide, 224 of 389 UCMR5-tested systems have reported PFAS detections (57.6%).

Westtown School's 651 violations sit above the Pennsylvania average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
900
Total Violations
651
Health-Based Violations
11
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Public/Private
Connections
28
County
Chester
School/Daycare
Yes
MCL Violations
10
Monitoring Violations
614
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 28 2018
Groundwater Rule MR 26 2022
Di(2-ethylhexyl) phthalate MR 23 2009
Benzo(a)pyrene MR 23 2009
Di(2-ethylhexyl) adipate MR 23 2009
Chlorine MR 22 2017
LASSO MR 21 2009
Hexachlorocyclopentadiene MR 21 2009
Pentachlorophenol MR 21 2009
Public Notice Other 17 2016
1,2,4-Trichlorobenzene MR 13 2009
Xylenes, Total MR 13 2009
DICHLOROMETHANE MR 13 2009
p-Dichlorobenzene MR 13 2009
1,1,1-Trichloroethane MR 13 2009
Carbon tetrachloride MR 13 2009
1,2-Dichloropropane MR 13 2009
Trichloroethylene MR 13 2009
Tetrachloroethylene MR 13 2009
Benzene MR 13 2009
Toluene MR 13 2009
Styrene MR 13 2009
cis-1,2-Dichloroethylene MR 13 2009
1,1-Dichloroethylene MR 13 2009
trans-1,2-Dichloroethylene MR 13 2009
1,1,2-Trichloroethane MR 13 2009
Ethylbenzene MR 13 2009
o-Dichlorobenzene MR 13 2009
1,2-Dichloroethane MR 13 2009
CHLOROBENZENE MR 13 2009

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Westtown School.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID PA1150834 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Pennsylvania Drinking Water Authority

Pennsylvania DEP, Bureau of Safe Drinking Water is the primacy agency that licenses and inspects Westtown School under EPA-delegated authority.

Open PA regulator portal

Source: Pennsylvania DEP, Bureau of Safe Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2023 Lead and Copper Rule MR 7 SDWIS / PA1150834 / 5000
2022 Groundwater Rule MR 26 SDWIS / PA1150834 / 0700
2021 TTHM MR 1 SDWIS / PA1150834 / 2950
2021 Total Haloacetic Acids (HAA5) MR 1 SDWIS / PA1150834 / 2456
2018 Nitrate MR 28 SDWIS / PA1150834 / 1040
2018 Nitrite MR 7 SDWIS / PA1150834 / 1041
2018 Consumer Confidence Rule Other 7 SDWIS / PA1150834 / 7000
2017 Chlorine MR 22 SDWIS / PA1150834 / 0999
2016 Public Notice Other 17 SDWIS / PA1150834 / 7500
2015 Cadmium MR 9 SDWIS / PA1150834 / 1015
2015 Selenium MR 9 SDWIS / PA1150834 / 1045
2015 Antimony, Total MR 9 SDWIS / PA1150834 / 1074
2015 Nickel MR 9 SDWIS / PA1150834 / 1036
2015 Arsenic MR 9 SDWIS / PA1150834 / 1005
2015 Chromium MR 9 SDWIS / PA1150834 / 1020

How Westtown School Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Westtown School Pennsylvania avg Federal benchmark
Total violations 651 150.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 11 8.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 57.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 900 1,640 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,701 regulated public water systems in Pennsylvania.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Westtown School water safe to drink? ▼
Westtown School (PWS ID: PA1150834) has 651 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 900 people using Groundwater sources.
How many people does Westtown School serve? ▼
Westtown School serves 900 people in West Chester, Pennsylvania. It is a Public/Private-owned system using Groundwater water sources with 28 service connections.
What type of violations does Westtown School have? ▼
Westtown School has 651 total violations: 11 health-based violations (MCL exceedances or treatment failures), 614 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Westtown School water? ▼
No PFAS testing data is available for Westtown School under the EPA's UCMR5 monitoring program.
What water source does Westtown School use? ▼
Westtown School uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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 system's figures are rendered directly from 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.