SONOMA STATE UNIVERSITY

ROHNERT PARK, CA · ~10,986 people served

Check your exact address → ROHNERT PARK overview

100

Excellent

PurityRadar safety score

PWSID

CA4910027

State

California

City

ROHNERT PARK

Population served

10,986

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

Lithium

11,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2018. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2017 Resolved

Treatment technique · EPA contaminant 0700 health-based began May 2017 Resolved

Monitoring & reporting · Total coliform began Dec 2011 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2004 Resolved

Max contaminant level (MCL) · Total coliform health-based began May 2002 Resolved

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

Max contaminant level (MCL) · Total coliform health-based began Nov 1999 Resolved

Max contaminant level (MCL) · Total coliform health-based began Mar 1998 Resolved

Monitoring & reporting · Total coliform began Jan 1998 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

State action · SOX Aug 2018
State action · SFL Feb 2018
State action · SOX Sep 2017
State action · SFL Jul 2017
State action · SIA Mar 2012
State action · SOX Jan 2012
State action · SOX Nov 2004
State action · SFL Nov 2004

This profile is built from EPA public records for system CA4910027 — 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.