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Water system · PWSID CA4110001

MID-PENINSULA WATER DISTRICT

BELMONT, CA · ~30,609 people served

Check your exact address → BELMONT overview
100
Excellent
PurityRadar safety score

PWSID

CA4110001

State

California

City

BELMONT

Population served

30,609

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

3

Violations on record

0

Unaddressed

3

Health-based

6

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2016. Official EPA record →

Treatment technique · EPA contaminant 0200 health-based began Mar 2015 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 2002 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 2001 Resolved

Recent enforcement actions

  • State action · SOX Nov 2016
  • State action · SFL Apr 2015
  • State action · SOX Jan 2003
  • State action · SIA Jan 2003
  • State action · SOX Jan 2002
  • State action · SIA Jan 2002

This profile is built from EPA public records for system CA4110001 — 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.