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Water system · PWSID CA4110027

WESTBOROUGH WATER DISTRICT

SOUTH SAN FRANCISCO, CA · ~13,486 people served

Check your exact address → SOUTH SAN FRANCISCO overview
100
Excellent
PurityRadar safety score

PWSID

CA4110027

State

California

City

SOUTH SAN FRANCISCO

Population served

13,486

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

2

Violations on record

0

Unaddressed

2

Health-based

4

Enforcement actions

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

Max contaminant level (MCL) · Total coliform health-based began Jul 1998 Resolved
Treatment technique · EPA contaminant 0200 health-based began Oct 1991 Resolved

Recent enforcement actions

  • State action · SOX Aug 1998
  • State action · SOX Jul 1998
  • State action · SIA Jul 1998
  • State action · SOX Jan 1997

This profile is built from EPA public records for system CA4110027 — 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.