- EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
- PFNA (a PFAS): found in 3 of 4 samples, average 4.8 ppt, highest 9.7 ppt (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- PFHxS (a PFAS): found in 2 of 4 samples, average 1.6 ppt, highest 3.6 ppt (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- PFOS (a PFAS): found in 1 of 4 samples, average 1.3 ppt, highest 5.1 ppt (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- PFPeA (a PFAS): found in 1 of 4 samples, average 1 ppt, highest 4.1 ppt (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- PFHxA (a PFAS): found in 1 of 4 samples, average 0.90 ppt, highest 3.5 ppt (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- Lead, 90th percentile: 2 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 Williamsport tap water? What EPA records show
EPA PA4410173 · serves Lycoming County, PA · about 51,000 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
Williamsport Mun Water Auth (EPA PA4410173)
EPA data as of October 14, 2026. For Williamsport's main utility, Williamsport Mun Water Auth: We found no health-based violations in EPA's records for this system (PA4410173) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 5. This is public data, not a test of your tap.
What EPA records show for Williamsport Mun Water Auth, as of October 14, 2026
We found no health-based violations in EPA's records for this system (PA4410173) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Williamsport Mun Water Auth (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 2 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 5.
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 Williamsport Mun Water Auth use chloramine?
We didn't find chloramine in Williamsport Mun Water Auth's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.