DEL ORO WC - BLACK BUTTE DISTRICT

CHICO, CA · ~277 people served

Check your exact address → CHICO overview

100

Excellent

PurityRadar safety score

PWSID

CA1100404

State

California

City

CHICO

Population served

277

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

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 1998. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Aug 1998 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jul 1998 Resolved

Max contaminant level (MCL) · Total coliform health-based began Apr 1997 Resolved

Monitoring & reporting · Total coliform began Jul 1995 Resolved

Monitoring & reporting · Total coliform began Mar 1995 Resolved

Monitoring & reporting · Total coliform began Feb 1995 Resolved

Recent enforcement actions

State action · SOX Oct 1998
State action · SIA Oct 1998
State action · SOX Aug 1998
State action · SOX Jul 1997
State action · SIA Jun 1997
State action · SIA Oct 1995
State action · SOX Aug 1995
State action · SIA May 1995

This profile is built from EPA public records for system CA1100404 — 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.