O'CONNOR TRACT CO-OPERATIVE WATER CO.

PALO ALTO, CA · ~2,789 people served

Check your exact address → PALO ALTO overview

100

Excellent

PurityRadar safety score

PWSID

CA4110019

State

California

City

PALO ALTO

Population served

2,789

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 Aug 2019. Official EPA record →

Treatment technique · Lead & Copper Rule health-based began Apr 2018 Resolved

Monitoring & reporting · Total coliform began Nov 2015 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 2004 Resolved

Max contaminant level (MCL) · Total coliform health-based began May 2000 Resolved

Recent enforcement actions

State action · SOX Aug 2019
State action · SFL May 2018
State action · SOX Dec 2015
State action · SFL Dec 2015
State action · SOX Oct 2012
State action · SFL Oct 2012
State action · SOX Oct 2004
State action · SFJ Oct 2004

This profile is built from EPA public records for system CA4110019 — 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.