TUD - COLUMBIA WATER SYSTEM

SONORA, CA · ~5,463 people served

Check your exact address → SONORA overview

100

Excellent

PurityRadar safety score

PWSID

CA5510013

State

California

City

SONORA

Population served

5,463

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

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring · Lead & Copper Rule began Apr 2025 Resolved

Treatment technique · EPA contaminant 0300 health-based began Feb 2007 Resolved

Recent enforcement actions

State action · SOX Sep 2025
State action · SFJ Aug 2025
State action · SOX Mar 2007
State action · SFL Mar 2007

This profile is built from EPA public records for system CA5510013 — 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.