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Water system · PWSID CA3500825

UNION HEIGHTS MWC

HOLLISTER, CA · ~98 people served

Check your exact address → HOLLISTER overview
100
Excellent
PurityRadar safety score

PWSID

CA3500825

State

California

City

HOLLISTER

Population served

98

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

13

Violations on record

0

Unaddressed

4

Health-based

21

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2010. Official EPA record →

Monitoring & reporting · Nitrite began Jan 2009 Resolved
Monitoring & reporting · Nitrate began Jan 2009 Resolved
Monitoring & reporting · Total coliform began May 2007 Resolved
Monitoring & reporting · Total coliform began Apr 2007 Resolved
Other · EPA contaminant 7000 began Jul 2006 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2006 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2006 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2003 Resolved
Monitoring & reporting · Total coliform began Jun 2002 Resolved
Max contaminant level (MCL) · Total coliform health-based began May 2002 Resolved
Max contaminant level (MCL) · Nitrate health-based began Oct 1999 Resolved
Max contaminant level (MCL) · Nitrate health-based began Jul 1999 Resolved

Recent enforcement actions

  • State action · SOX Oct 2010
  • State action · SFL Jul 2010
  • State action · SOX Dec 2007
  • State action · SFL Dec 2007
  • State action · SOX Oct 2007
  • State action · SIA Oct 2007
  • State action · SIA Jun 2007
  • State action · SOX Jun 2007

This profile is built from EPA public records for system CA3500825 — 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.