MADRONE MUTUAL WATER COMPANY

COTATI, CA · ~76 people served

Check your exact address → COTATI overview

100

Excellent

PurityRadar safety score

PWSID

CA4900513

State

California

City

COTATI

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 Jun 2015. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began May 2015 Resolved

Max contaminant level (MCL) · Total coliform health-based began Feb 2015 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2014 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2013 Resolved

Max contaminant level (MCL) · Total coliform health-based began Dec 2010 Resolved

Max contaminant level (MCL) · Total coliform health-based began Apr 2010 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 2009 Resolved

Max contaminant level (MCL) · Total coliform health-based began Aug 2009 Resolved

Max contaminant level (MCL) · Total coliform health-based began Aug 2006 Resolved

Monitoring & reporting · Total coliform began Jul 1998 Resolved

Recent enforcement actions

State action · SOX Jun 2015
State action · SFL Jun 2015
State action · SOX May 2015
State action · SFL Apr 2015
State action · SFL Dec 2014
State action · SOX Nov 2014
State action · SFL Dec 2013
State action · SOX Nov 2013

This profile is built from EPA public records for system CA4900513 — 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.