MUSTANG SPRINGS MUTUAL WATER

PASO ROBLES, CA · ~30 people served

Check your exact address → PASO ROBLES overview

100

Excellent

PurityRadar safety score

PWSID

CA4000775

State

California

City

PASO ROBLES

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 May 2023. Official EPA record →

Max contaminant level (MCL) · Fluoride health-based began Oct 2022 Resolved

Max contaminant level (MCL) · Fluoride health-based began Jul 2022 Resolved

Max contaminant level (MCL) · Fluoride health-based began Jul 2016 Resolved

Monitoring & reporting · Total coliform began Mar 2008 Resolved

Monitoring & reporting · Total coliform began Jul 2007 Resolved

Monitoring & reporting · Total coliform began May 2003 Resolved

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

Recent enforcement actions

State action · SOX May 2023
State action · SFL Jul 2016
State action · SOX Apr 2008
State action · SIE Apr 2008
State action · SOX Aug 2007
State action · SIE Aug 2007
EPA/federal action · EOX Sep 2005
State action · SOX Jun 2003

This profile is built from EPA public records for system CA4000775 — 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.