- EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
- PFPeA (a PFAS): found in 4 of 4 samples, average 3.7 ppt, highest 4.1 ppt (EPA UCMR 5 testing, Feb 2024–Nov 2024)
- PFHxA (a PFAS): found in 4 of 4 samples, average 3.5 ppt, highest 3.9 ppt (EPA UCMR 5 testing, Feb 2024–Nov 2024)
- PFBS (a PFAS): found in 3 of 4 samples, average 3 ppt, highest 4.5 ppt (EPA UCMR 5 testing, Feb 2024–Nov 2024)
- PFOA (a PFAS): found in 2 of 4 samples, average 2.4 ppt, highest 5.1 ppt (EPA UCMR 5 testing, Feb 2024–Nov 2024)
- Lead, 90th percentile: 4.76 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jun 1, 2025–Sep 30, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Chester tap water? What EPA records show
EPA PA1230004 · serves Delaware County, PA · about 140,437 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Chester Water Authority (EPA PA1230004)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Chester's main utility, Chester Water Authority: We found no health-based violations in EPA's records for this system (PA1230004) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
What EPA records show for Chester Water Authority, as of October 14, 2026
We found no health-based violations in EPA's records for this system (PA1230004) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Chester Water Authority (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 4.76 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jun 1, 2025–Sep 30, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Chester Water Authority use chloramine?
EPA treatment records (state-reported) list chloramines for Chester Water Authority. EPA record