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Water system · PWSID CA1500449

FOURTH STREET WATER SYSTEM

LAKE ISABELLA, CA · ~56 people served

Check your exact address → LAKE ISABELLA overview
100
Excellent
PurityRadar safety score

PWSID

CA1500449

State

California

City

LAKE ISABELLA

Population served

56

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

40

Violations on record

0

Unaddressed

35

Health-based

6

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Apr 2017. Official EPA record →

Max contaminant level (MCL) · Arsenic health-based began Jul 2016 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2016 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2016 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2015 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2015 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2015 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2015 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2013 Resolved

Recent enforcement actions

  • State action · SOX Apr 2017
  • State action · SFL Apr 2013
  • State action · SOX Mar 2011
  • State action · SFL Jan 2009
  • State action · SOX Jun 2008
  • State action · SFL Jun 2008

This profile is built from EPA public records for system CA1500449 — 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.