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Water system · PWSID MI0007120

WILLIAMSTON, CITY OF

WILLIAMSTON, MI · ~3,917 people served

Check your exact address → WILLIAMSTON overview
100
Excellent
PurityRadar safety score

PWSID

MI0007120

State

Michigan

City

WILLIAMSTON

Population served

3,917

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

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

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 Sep 2025). Levels in parts per trillion (ppt).

Lithium

24,000 ppt

limit —

No federal limit

Violations & enforcement

5

Violations on record

0

Unaddressed

1

Health-based

14

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2021. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2019 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2019 Resolved
Max contaminant level (MCL) · Uranium health-based began Jul 2008 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jun 2005 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jun 2005 Resolved

Recent enforcement actions

  • State action · SOX Jun 2021
  • State action · SIA Aug 2020
  • State action · SIE Aug 2020
  • State action · SIF Nov 2008
  • State action · SIE Oct 2008
  • State action · SIA Oct 2008
  • State action · SOX Sep 2008
  • State action · SIF Jun 2006

This profile is built from EPA public records for system MI0007120 — 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.