CHESTER WATER AUTHORITY
High Risk1 PFAS compound(s) exceed EPA Maximum Contaminant Levels
This utility has until 2029 to install treatment under the EPA's April 2024 PFAS rule. In the meantime, a point-of-use filter certified NSF/ANSI 58 for PFOA/PFOS provides reliable interim protection.
4
PFAS Detected
1
Above EPA Limits
35
ZIPs Served
Surface
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 5.10ppt | 128% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 4.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.10ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.90ppt | No federal limit | — | Unregulated |
ZIP Codes Served by This Utility
19013 19014 19015 19016 19017 19060 19061 19063 19064 19086 19311 19312 19317 19319 19330 19331 19339 19340 19342 19343 19346 19348 19350 19352 19355 19357 19360 19362 19363 19372 19373 19374 19380 19382 19390
Click any ZIP to see the full result page for that area.
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
PA1230004
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor