CITY OF PALO ALTO

PALO ALTO, CA · ~67,231 people served

Check your exact address → PALO ALTO overview

100

Excellent

PurityRadar safety score

PWSID

CA4310009

State

California

City

PALO ALTO

Population served

67,231

Primary source

SWP

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 Feb 2018. Official EPA record →

Treatment technique · EPA contaminant 0200 health-based began Mar 2015 Resolved

Max contaminant level (MCL) · Total coliform health-based began May 2012 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jul 2010 Resolved

Treatment technique · EPA contaminant 0200 health-based began Mar 1995 Resolved

Treatment technique · EPA contaminant 0200 health-based began Mar 1992 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 1992 Resolved

Recent enforcement actions

State action · SOX Feb 2018
State action · SOX Aug 2015
State action · SFL Apr 2015
State action · SOX Jun 2012
State action · SFL Sep 2010
State action · SOX Aug 2010
EPA/federal action · EOX Mar 2000
State action · SOX Apr 1997

This profile is built from EPA public records for system CA4310009 — 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.