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Water system · PWSID CA4700549

LAKE SISKIYOU M.W.C.

MT. SHASTA, CA · ~277 people served

Check your exact address → MT. SHASTA overview
100
Excellent
PurityRadar safety score

PWSID

CA4700549

State

California

City

MT. SHASTA

Population served

277

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

14

Violations on record

0

Unaddressed

12

Health-based

29

Enforcement actions

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

Treatment technique · Lead & Copper Rule health-based began May 2020 Resolved
Max contaminant level (MCL) · Lead & Copper Rule health-based began Dec 2019 Resolved
Monitoring · Lead & Copper Rule began Sep 2019 Resolved
Treatment technique · Lead & Copper Rule health-based began Jul 2019 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2018 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2014 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2014 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2011 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2010 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2007 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2006 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2000 Resolved

Recent enforcement actions

  • State action · SOX May 2021
  • State action · SFJ Feb 2021
  • State action · SOX Feb 2021
  • State action · SOX Jun 2020
  • State action · SFH May 2020
  • State action · SOX Mar 2020
  • State action · SFL Jan 2020
  • State action · SFL Jan 2020

This profile is built from EPA public records for system CA4700549 — 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.