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Water system · PWSID CA3700291

OCOTILLO OASIS, LLC

SAN MARCOS, CA · ~96 people served

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

PWSID

CA3700291

State

California

City

SAN MARCOS

Population served

96

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

24

Violations on record

0

Unaddressed

20

Health-based

25

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2024. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2023 Addressed
Max contaminant level (MCL) · Nitrate health-based began Sep 2019 Resolved
Max contaminant level (MCL) · Fluoride health-based began Oct 2017 Resolved
Max contaminant level (MCL) · Fluoride health-based began Jul 2017 Resolved
Max contaminant level (MCL) · Fluoride health-based began Apr 2017 Resolved
Max contaminant level (MCL) · Fluoride health-based began Jan 2017 Resolved
Max contaminant level (MCL) · Fluoride health-based began Oct 2016 Resolved
Max contaminant level (MCL) · Fluoride health-based began Jul 2016 Resolved
Max contaminant level (MCL) · Fluoride health-based began Apr 2016 Resolved
Max contaminant level (MCL) · Fluoride health-based began Jan 2016 Resolved
Max contaminant level (MCL) · Fluoride health-based began Oct 2015 Resolved
Max contaminant level (MCL) · Fluoride health-based began Jul 2015 Resolved

Recent enforcement actions

  • State action · SFL Jun 2024
  • State action · SOX Oct 2019
  • State action · SFL Oct 2019
  • State action · SOX Jan 2018
  • State action · SOX Jan 2018
  • State action · SOX Jan 2018
  • State action · SFL Jun 2017
  • State action · SFL Feb 2015

This profile is built from EPA public records for system CA3700291 — 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.