ONSTED

ONSTED, MI · ~907 people served

Check your exact address → ONSTED overview

100

Excellent

PurityRadar safety score

PWSID

MI0005020

State

Michigan

City

ONSTED

Population served

907

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

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Reporting · Lead & Copper Rule began Dec 2025 Unaddressed

Reporting · EPA contaminant 5200 began Jul 2025 Unaddressed

Monitoring & reporting · Lead & Copper Rule began Oct 2024 Unaddressed

Monitoring & reporting · Arsenic began Apr 2024 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Aug 2019 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Aug 2019 Resolved

Monitoring & reporting · Total coliform began Nov 2011 Resolved

Monitoring & reporting · Total coliform began Oct 2009 Resolved

Recent enforcement actions

State action · SIA Dec 2025
State action · SIE Dec 2025
State action · SIA Jan 2025
State action · SIE Jan 2025
State action · SIA Sep 2024
State action · SIA Jul 2024
State action · SOX Jul 2024
State action · SOX Jul 2021

This profile is built from EPA public records for system MI0005020 — 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.