PWSID
PA1230004
State
Pennsylvania
City
CHESTER
Population served
140,437
Primary source
Surface water
Score history
▼ 15 points — the score moved from 100 to 85 on Jun 18, 2026, as newly published EPA data was incorporated.
2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.
PFAS & contaminant readings
Latest detections from EPA’s UCMR5 monitoring (through Nov 2024). Levels in parts per trillion (ppt).
PFOA
Perfluorooctanoic acid
5.1 ppt
limit 4 ppt
PFBS
3.2 ppt
limit —
PFHxA
3.2 ppt
limit —
PFPeA
3.2 ppt
limit —
Violations & enforcement
1
Violations on record
0
Unaddressed
0
Health-based
14
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Apr 2012. Official EPA record →
Recent enforcement actions
- State action · SOX Apr 2012
- State action · SIF Apr 2012
- State action · SIA Nov 2011
- State action · SIE Nov 2011
- State action · SOX Jun 1993
- EPA/federal action · EF! Jan 1993
- State action · SOX Nov 1992
- EPA/federal action · EOX Sep 1992
Area water-quality monitoring
Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.
Manganese
1 station · latest Mar 2025
Copper
1 station · latest Mar 2025
Nitrate
1 station · latest Oct 2022
Lead
1 station · latest May 2023
Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.
This profile is built from EPA public records for system PA1230004 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.