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Water system · PWSID NJ0811002

MONROE MUNICIPAL UTILITIES AUTHORITY

WILLIAMSTOWN, NJ · ~26,179 people served

Check your exact address → WILLIAMSTOWN overview
78
Good
PurityRadar safety score

PWSID

NJ0811002

State

New Jersey

City

WILLIAMSTOWN

Population served

26,179

Primary source

SWP

Score history

▼ 22 points — the score moved from 100 to 78 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 78

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

PFOA

Perfluorooctanoic acid

4.7 ppt

limit 4 ppt

Above EPA limit · 1.2×

PFOS

Perfluorooctanesulfonic acid

4.2 ppt

limit 4 ppt

Above EPA limit · 1.0×

Lithium

10,700 ppt

limit —

No federal limit

PFHxA

3.2 ppt

limit —

No federal limit

Violations & enforcement

411

Violations on record

0

Unaddressed

9

Health-based

125

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2025. Official EPA record →

Monitoring & reporting · EPA contaminant 0200 began Jun 2025 Resolved
Monitoring & reporting · EPA contaminant 0999 began Apr 2025 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2022 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2020 Resolved
Monitoring & reporting · EPA contaminant 2931 began Oct 2020 Resolved
Monitoring & reporting · EPA contaminant 2946 began Oct 2020 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jun 2020 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jun 2020 Resolved
Monitoring & reporting · EPA contaminant 0200 began Aug 2019 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 2018 Resolved
Monitoring & reporting · Selenium began Apr 2017 Resolved
Monitoring & reporting · Selenium began Apr 2017 Resolved

Recent enforcement actions

  • State action · SOX Aug 2025
  • State action · SFJ Aug 2025
  • State action · SIE Aug 2025
  • State action · SOX Jul 2025
  • State action · SFJ Jul 2025
  • State action · SFJ Aug 2022
  • State action · SOX Feb 2022
  • State action · SIF Jun 2021

This profile is built from EPA public records for system NJ0811002 — 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.