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Water system · PWSID CA2810004

ST. HELENA, CITY OF

ST. HELENA, CA · ~5,386 people served

Check your exact address → ST. HELENA overview
100
Excellent
PurityRadar safety score

PWSID

CA2810004

State

California

City

ST. HELENA

Population served

5,386

Primary source

Surface water

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

Lithium

54,000 ppt

limit —

No federal limit

Violations & enforcement

7

Violations on record

1

Unaddressed

6

Health-based

13

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2020. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2022 Unaddressed
Treatment technique · EPA contaminant 0200 health-based began Nov 2020 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2017 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Oct 2016 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2016 Resolved
Max contaminant level (MCL) · Total coliform health-based began Feb 1995 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Recent enforcement actions

  • State action · SFL Dec 2020
  • State action · SOX Dec 2020
  • State action · SOX Dec 2017
  • State action · SOX Dec 2017
  • State action · SFL Jan 2017
  • State action · SOX Jan 2017
  • EPA/federal action · EOX Mar 2000
  • State action · SOX Feb 1995

This profile is built from EPA public records for system CA2810004 — 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.