SANTA MARGARITA WATER DISTRICT-ID9

RANCHO SANTA MARGARITA, CA · ~39,684 people served

Check your exact address → RANCHO SANTA MARGARITA overview

100

Excellent

PurityRadar safety score

PWSID

CA3010030

State

California

City

RANCHO SANTA MARGARITA

Population served

39,684

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 Mar 2025). Levels in parts per trillion (ppt).

Lithium

47,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2023. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2022 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2020 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2013 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2013 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2012 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2012 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2012 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2012 Resolved

Monitoring & reporting · Nitrate began Jan 2011 Resolved

Monitoring & reporting · EPA contaminant 2955 began Jan 2011 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 1995 Resolved

Recent enforcement actions

State action · SOX Feb 2023
State action · SFJ Jan 2023
State action · SOX Jul 2021
State action · SFL Feb 2021
State action · SIA Sep 2013
State action · SOX Aug 2013
State action · SIA Jul 2012
State action · SOX Jun 2012

This profile is built from EPA public records for system CA3010030 — 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.