WILLOWSIDE MUTUAL WATER COMPANY

SANTA ROSA, CA · ~448 people served

Check your exact address → SANTA ROSA overview

100

Excellent

PurityRadar safety score

PWSID

CA4900561

State

California

City

SANTA ROSA

Population served

448

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 Aug 2008. Official EPA record →

Monitoring & reporting · Total coliform began Sep 2007 Resolved

Monitoring & reporting · Nitrate began Jan 2007 Resolved

Monitoring & reporting · EPA contaminant 2946 began Jan 2007 Resolved

Monitoring & reporting · Total coliform began May 1996 Resolved

Monitoring & reporting · Total coliform began Jan 1995 Resolved

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

Recent enforcement actions

State action · SOX Aug 2008
State action · SFL Jul 2008
State action · SOX Oct 2007
State action · SFL Oct 2007
EPA/federal action · EOX Dec 2003
State action · SFJ Jul 1996
State action · SOX Jul 1996
State action · SOX Mar 1995

This profile is built from EPA public records for system CA4900561 — 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.