Home/ Directory/ CA/ SIERRA MUTUAL WATER COMPANY

Water system · PWSID CA5403110

SIERRA MUTUAL WATER COMPANY

PORTERVILLE, CA · ~43 people served

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

PWSID

CA5403110

State

California

City

PORTERVILLE

Population served

43

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

53

Violations on record

0

Unaddressed

34

Health-based

51

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2021. Official EPA record →

Max contaminant level (MCL) · Nitrate health-based began Jul 2021 Resolved
Max contaminant level (MCL) · Nitrate health-based began Apr 2021 Resolved
Max contaminant level (MCL) · Nitrate health-based began Jan 2021 Resolved
Max contaminant level (MCL) · Nitrate health-based began Oct 2020 Resolved
Monitoring & reporting · Nitrate began Jul 2020 Resolved
Monitoring · Lead & Copper Rule began Jul 2020 Resolved
Max contaminant level (MCL) · Nitrate health-based began Apr 2020 Resolved
Max contaminant level (MCL) · Nitrate health-based began Jan 2020 Resolved
Max contaminant level (MCL) · Nitrate health-based began Oct 2019 Resolved
Max contaminant level (MCL) · Nitrate health-based began Jul 2019 Resolved
Monitoring · Lead & Copper Rule began May 2019 Resolved
Max contaminant level (MCL) · Nitrate health-based began Apr 2019 Resolved

Recent enforcement actions

  • State action · SOX Jul 2021
  • State action · SOX Dec 2020
  • State action · SFL Nov 2020
  • State action · SFO Oct 2020
  • State action · SOX Sep 2020
  • State action · SFL Sep 2020
  • State action · SOX Jan 2020
  • State action · SOX Jan 2020

This profile is built from EPA public records for system CA5403110 — 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.