COUNTY SERVICE AREA 11

REDWOOD CITY, CA · ~642 people served

Check your exact address → REDWOOD CITY overview

100

Excellent

PurityRadar safety score

PWSID

CA4100582

State

California

City

REDWOOD CITY

Population served

642

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 Jul 2019. Official EPA record →

Treatment technique · Lead & Copper Rule health-based began Jun 2019 Resolved

Monitoring & reporting · EPA contaminant 2990 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2977 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2992 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2964 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2987 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2989 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2981 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2985 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2980 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2968 began Jan 2004 Resolved

Monitoring & reporting · EPA contaminant 2991 began Jan 2004 Resolved

Recent enforcement actions

State action · SOX Jul 2019
State action · SFL Jul 2019
State action · SOX Jan 2019
State action · SOX Jan 2019
State action · SOX Jan 2019
State action · SOX Feb 2018
State action · SIA Apr 2005

This profile is built from EPA public records for system CA4100582 — 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.