GRATON MUTUAL WATER SYSTEM

ROHNERT PARK, CA · ~50 people served

Check your exact address → ROHNERT PARK overview

100

Excellent

PurityRadar safety score

PWSID

CA4901221

State

California

City

ROHNERT PARK

Population served

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 Mar 2018. Official EPA record →

Monitoring & reporting · Nitrite began Jan 2006 Resolved

Monitoring & reporting · Nitrate began Jan 2006 Resolved

Monitoring & reporting · EPA contaminant 2990 began Jan 2006 Resolved

Monitoring & reporting · EPA contaminant 2050 began Jan 2006 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jun 2003 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 2000 Resolved

Monitoring & reporting · Total coliform began Apr 1999 Resolved

Recent enforcement actions

State action · SOX Mar 2018
State action · SFL Dec 2007
State action · SOX Dec 2007
State action · SFL Jun 2007
State action · SFL Aug 2003
State action · SOX Jul 2003
State action · SFL Nov 2000
State action · SOX Oct 2000

This profile is built from EPA public records for system CA4901221 — 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.