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Water system · PWSID CA5510008

LAKE DON PEDRO CSD

LA GRANGE, CA · ~3,240 people served

Check your exact address → LA GRANGE overview
85
Excellent
PurityRadar safety score

PWSID

CA5510008

State

California

City

LA GRANGE

Population served

3,240

Primary source

Surface water

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 85 Jun 18, 2026 · score 85

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

23

Violations on record

2

Unaddressed

13

Health-based

15

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Reporting · EPA contaminant 5200 began Oct 2024 Unaddressed
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Unaddressed
Monitoring · Lead & Copper Rule began Apr 2025 Resolved
Monitoring & reporting · Nitrate began Jan 2024 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2017 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2009 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2008 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2007 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2007 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2007 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2007 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2007 Resolved

Recent enforcement actions

  • State action · SOX Sep 2025
  • State action · SFJ Aug 2025
  • State action · SOX Mar 2025
  • State action · SFL Feb 2025
  • State action · SIA Nov 2018
  • State action · SOX Nov 2018
  • State action · SOX May 2010
  • State action · SFL Dec 2008

This profile is built from EPA public records for system CA5510008 — 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.