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Water system · PWSID CA3010101

SANTA MARGARITA WATER DISTRICT

RANCHO SANTA MARGARITA, CA · ~168,289 people served

Check your exact address → RANCHO SANTA MARGARITA overview
100
Excellent
PurityRadar safety score

PWSID

CA3010101

State

California

City

RANCHO SANTA MARGARITA

Population served

168,289

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

Latest detections from EPA’s UCMR5 monitoring (through Jun 2025). Levels in parts per trillion (ppt).

Lithium

29,700 ppt

limit —

No federal limit

Violations & enforcement

1

Violations on record

0

Unaddressed

0

Health-based

2

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2011. Official EPA record →

Monitoring & reporting · Total coliform began May 2009 Resolved

Recent enforcement actions

  • State action · SOX Feb 2011
  • State action · SIA Feb 2011

This profile is built from EPA public records for system CA3010101 — 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.