VALENZUELA WATER SYSTEM

HOLLISTER, CA · ~55 people served

Check your exact address → HOLLISTER overview

100

Excellent

PurityRadar safety score

PWSID

CA3500527

State

California

City

HOLLISTER

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 Aug 2025. Official EPA record →

Monitoring · Lead & Copper Rule began Jun 2024 Resolved

Monitoring · Lead & Copper Rule began Mar 2020 Resolved

Max contaminant level (MCL) · Nitrate health-based began Jan 2011 Resolved

Max contaminant level (MCL) · Nitrate health-based began Oct 2010 Resolved

Other · EPA contaminant 7000 began Jul 2009 Resolved

Monitoring & reporting · Total coliform began Nov 2007 Resolved

Max contaminant level (MCL) · Nitrate health-based began Oct 2007 Resolved

Max contaminant level (MCL) · Nitrate health-based began Jul 2007 Resolved

Other · EPA contaminant 7000 began Jul 2007 Resolved

Monitoring & reporting · Lead & Copper Rule began Nov 2005 Resolved

Monitoring & reporting · Total coliform began Aug 2005 Resolved

Monitoring & reporting · EPA contaminant 0999 began Jan 2005 Resolved

Recent enforcement actions

State action · SFL Aug 2025
State action · SFL Aug 2024
State action · SOX Aug 2024
State action · SOX Jun 2020
State action · SFL Apr 2020
State action · SOX Mar 2013
State action · SFL Mar 2011
State action · SOX Aug 2010

This profile is built from EPA public records for system CA3500527 — 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.