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Water system · PWSID CA3701793

TWIN LAKES RESORT

LA MESA, CA · ~400 people served

Check your exact address → LA MESA overview
100
Excellent
PurityRadar safety score

PWSID

CA3701793

State

California

City

LA MESA

Population served

400

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

10

Violations on record

1

Unaddressed

0

Health-based

15

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Jul 1993 Unaddressed
Monitoring & reporting · Lead & Copper Rule began Oct 2021 Addressed
Other · EPA contaminant 7500 began Dec 2016 Addressed
Monitoring & reporting · Total coliform began Aug 2015 Resolved
Monitoring & reporting · Total coliform began Mar 2014 Resolved
Monitoring & reporting · Total coliform began Nov 2009 Resolved
Monitoring & reporting · Lead & Copper Rule began Apr 2009 Addressed
Monitoring & reporting · Total coliform began Feb 2009 Resolved
Monitoring & reporting · Lead & Copper Rule began Jun 2007 Addressed
Other · EPA contaminant 7000 began Jul 2005 Resolved

Recent enforcement actions

  • State action · SFO Aug 2025
  • State action · SFO Aug 2024
  • State action · SOX Sep 2015
  • State action · SFL Sep 2015
  • State action · SOX Apr 2014
  • State action · SFL Apr 2014
  • State action · SFL Jul 2010
  • State action · SOX Dec 2009

This profile is built from EPA public records for system CA3701793 — 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.