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Water system · PWSID CA1910234

WALNUT VALLEY WATER DISTRICT

WALNUT, CA · ~100,941 people served

Check your exact address → WALNUT overview
100
Excellent
PurityRadar safety score

PWSID

CA1910234

State

California

City

WALNUT

Population served

100,941

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 2024). Levels in parts per trillion (ppt).

Lithium

33,800 ppt

limit —

No federal limit

Violations & enforcement

1

Violations on record

0

Unaddressed

1

Health-based

5

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 1994. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Sep 1994 Resolved

Recent enforcement actions

  • State action · SFJ Oct 1994
  • State action · SOX Oct 1994
  • EPA/federal action · EOX Dec 1993
  • EPA/federal action · EFJ May 1993
  • EPA/federal action · EOX Dec 1992

This profile is built from EPA public records for system CA1910234 — 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.