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Water system · PWSID CA3710002

VALLECITOS WD

SAN MARCOS, CA · ~113,500 people served

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

PWSID

CA3710002

State

California

City

SAN MARCOS

Population served

113,500

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 Nov 2023). Levels in parts per trillion (ppt).

Lithium

9,300 ppt

limit —

No federal limit

Violations & enforcement

1

Violations on record

1

Unaddressed

0

Health-based

1

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 1996. Official EPA record →

Reporting · EPA contaminant 5200 began Jul 2025 Unaddressed

Recent enforcement actions

  • State action · SFL Jan 1996

This profile is built from EPA public records for system CA3710002 — 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.