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Water system · PWSID MI0004170

MASON, CITY OF

MASON, MI · ~8,252 people served

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

PWSID

MI0004170

State

Michigan

City

MASON

Population served

8,252

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 Jul 2023). Levels in parts per trillion (ppt).

Lithium

15,000 ppt

limit —

No federal limit

Violations & enforcement

10

Violations on record

0

Unaddressed

3

Health-based

50

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2024. Official EPA record →

Other · EPA contaminant 7000 began Jul 2023 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2023 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2023 Resolved
Monitoring & reporting · Uranium began Jan 2022 Resolved
Other · EPA contaminant 7000 began Jul 2021 Resolved
Max contaminant level (MCL) · Uranium health-based began Jan 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 2003 Resolved
Monitoring & reporting · Gross alpha began Jan 1999 Resolved
Monitoring & reporting · Total coliform began May 1998 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 1997 Resolved

Recent enforcement actions

  • State action · SOX Sep 2024
  • State action · SIF Aug 2024
  • State action · SIF Aug 2024
  • State action · SOX Jan 2024
  • State action · SOX Nov 2023
  • State action · SIA Nov 2023
  • State action · SIE Oct 2023
  • State action · SIA Oct 2023

This profile is built from EPA public records for system MI0004170 — 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.