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Water system · PWSID PA4410173

WILLIAMSPORT MUN WATER AUTH

WILLIAMSPORT, PA · ~51,000 people served

Check your exact address → WILLIAMSPORT overview

Excellent

PurityRadar safety score

PWSID

PA4410173

State

Pennsylvania

City

WILLIAMSPORT

Population served

51,000

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.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 85

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 Dec 2024). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

5.1 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFNA

Perfluorononanoic acid

4.5 ppt

limit 10 ppt

Below EPA limit

PFHxS

Perfluorohexanesulfonic acid

3.6 ppt

limit 10 ppt

Below EPA limit

PFPeA

4.1 ppt

limit —

No federal limit

PFHxA

3.5 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2020. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2018 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2018 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2018 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2018 Resolved

Monitoring & reporting · EPA contaminant 2968 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2969 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2977 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2979 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2980 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2981 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2982 began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 2983 began Oct 2012 Resolved

Recent enforcement actions

State action · SOX Dec 2020
State action · SIA Jan 2020
State action · SIA Jan 2020
State action · SIA Dec 2019
State action · SIF Dec 2019
State action · SIE Dec 2019
State action · SOX Dec 2019
State action · SIA Apr 2019

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.

ContaminantMedian · max · samples

Nitrate

2 stations · latest Mar 2025

0.46 · max 0.82 mg/L · 62

Manganese

1 station · latest Mar 2025

128 · max 943 ug/L · 51

Copper

1 station · latest Mar 2025

1.64 · max 22.6 ug/L · 21

Lead

1 station · latest Dec 2023

1.55 · max 5.39 ug/L · 9

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 PA4410173 — 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.