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Water system · PWSID NM3520001

SHIRK MOBILE HOME PARK

SAN MATEO, CA · ~39 people served

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

PWSID

NM3520001

State

California

City

SAN MATEO

Population served

39

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

44

Violations on record

0

Unaddressed

7

Health-based

131

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Reporting · EPA contaminant 5200 began Oct 2024 Resolved
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2024 Resolved
Other · EPA contaminant 7000 began Oct 2024 Resolved
Other · EPA contaminant 0700 began Feb 2023 Resolved
Monitoring & reporting · EPA contaminant 3014 began Feb 2018 Resolved
Treatment technique · Lead & Copper Rule health-based began Dec 2017 Resolved
Other · EPA contaminant 7500 began Aug 2017 Resolved
Other · EPA contaminant 7500 began Aug 2017 Resolved
Other · EPA contaminant 7000 began Jul 2017 Resolved
Other · EPA contaminant 7500 began Jun 2017 Resolved
Other · EPA contaminant 7500 began May 2017 Resolved

Recent enforcement actions

  • State action · SIF Sep 2025
  • State action · SIF Sep 2025
  • State action · SOX Sep 2025
  • State action · SOX Sep 2025
  • State action · SIA Aug 2025
  • State action · SOX Jun 2025
  • State action · SIA Apr 2025
  • State action · SIE Apr 2025

This profile is built from EPA public records for system NM3520001 — 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.