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Water system · PWSID CA4010022

LOPEZ PROJECT

SAN LUIS OBISPO, CA · ~1,569 people served

Check your exact address → SAN LUIS OBISPO overview
100
Excellent
PurityRadar safety score

PWSID

CA4010022

State

California

City

SAN LUIS OBISPO

Population served

1,569

Primary source

Surface water

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

3

Violations on record

0

Unaddressed

2

Health-based

5

Enforcement actions

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

Max contaminant level (MCL) · Lead & Copper Rule health-based began Apr 2025 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2008 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

  • State action · SFL May 2025
  • State action · SOX May 2025
  • State action · SOX Sep 2008
  • State action · SFL Sep 2008
  • EPA/federal action · EOX Mar 2000

This profile is built from EPA public records for system CA4010022 — 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.