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Water system · PWSID CA2800521

CIRCLE OAKS WATER DISTRICT

100
Excellent
PurityRadar safety score

PWSID

CA2800521

State

California

City

NAPA

Population served

500

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

0

Health-based

5

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2021. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2020 Resolved
Monitoring & reporting · Total coliform began Dec 2006 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

  • State action · SOX Mar 2021
  • State action · SFL Feb 2021
  • State action · SIA Feb 2007
  • State action · SOX Jan 2007
  • EPA/federal action · EOX Jun 2002

This profile is built from EPA public records for system CA2800521 — 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.