County · Pennsylvania
Chester County, Pennsylvania: drinking water records
This overview covers 39 ZIP codes and 60 community water systems in Chester County. It also stands in for 4 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 |
|---|---|---|---|---|---|
| Pa American Royersford PA1150166 | 49,508 | 360 | 8 | 1 | 2 ppb |
| Phoenixville Water Dept PA1150077 | 16,599 | 120 | 7 | 1 | 1 ppb |
| Kennett Square Mun Water Works PA1150108 | 6,328 | 360 | 8 | 2 | 0 ppb |
| Aqua Pa West Chester PA1150098 | 48,600 | 180 | 5 | 0 | 0 ppb |
| Pa American Coatesville PA1150106 | 36,960 | 120 | 2 | 0 | 2 ppb |
| Aqua Pa Uwchlan PA1150035 | 35,518 | 480 | 6 | 0 | 2.2 ppb |
| Downingtown Water Authority PA1150026 | 9,900 | 120 | 4 | 0 | 2 ppb |
| Aqua Pa Friendship PA1150137 | 8,800 | 480 | 8 | 0 | 0 ppb |
| Aqua Pa Spring Run PA1150089 | 8,151 | 300 | 9 | 0 | 0 ppb |
| Oxford Borough PA1150066 | 5,280 | 180 | 5 | 0 | 0 ppb |
| London Grove TWP Mun Auth PA1150165 | 4,770 | 180 | 4 | 0 | 0 ppb |
| North Coventry Water System PA1150220 | 2,907 | 0 | 0 | 2 | 800 ppb |
| Honey Brook Boro Water PA1150127 | 2,892 | 0 | 0 | 1 | 10 ppb |
| West Grove Borough PA1150105 | 2,873 | 0 | 0 | 1 | 3 ppb |
| Westtown School PA1150834 | 900 | 0 | 0 | 1 | 2 ppb |
| Indian Run Village MHP PA1150051 | 550 | 0 | 0 | 2 | 5 ppb |
| Nottingham Manor M H Court PA1150177 | 473 | 0 | 0 | 2 | 16 ppb |
| Appleville Mobile Home Park PA1150094 | 461 | 0 | 0 | 1 | 16 ppb |
| Spring Run Estates WTP PA1150216 | 450 | 0 | 0 | 2 | 29 ppb |
| Longwood Gardens PA1150131 | 440 | 0 | 0 | 1 | 1 ppb |
| Avonwheel Estate MHP PA1150004 | 300 | 0 | 0 | 3 | 6 ppb |
| Aqua Pa Franklin PA1150126 | 265 | 0 | 0 | 1 | 0 ppb |
| Creekview MHP PA1150083 | 200 | 0 | 0 | 1 | 3.5 ppb |
| Imperial Mobile Home Park PA1150013 | 151 | 0 | 0 | 1 | 21 ppb |
| Loags Corner Mobile Home Park PA1150030 | 130 | 0 | 0 | 2 | 7 ppb |
ZIP reports in Chester 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: 19316, 19343, 19358, 19520.
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.