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Water system · PWSID CA2810002

CALISTOGA, CITY OF

CALISTOGA, CA · ~5,610 people served

Check your exact address → CALISTOGA overview
44
Action needed
PurityRadar safety score

PWSID

CA2810002

State

California

City

CALISTOGA

Population served

5,610

Primary source

Surface water

Score history

▼ 56 points — the score moved from 100 to 44 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 44

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

PFOS

Perfluorooctanesulfonic acid

12 ppt

limit 4 ppt

Above EPA limit · 3.1×

PFOA

Perfluorooctanoic acid

6.4 ppt

limit 4 ppt

Above EPA limit · 1.6×

PFPeA

4.2 ppt

limit —

No federal limit

PFHxA

3.2 ppt

limit —

No federal limit

Violations & enforcement

16

Violations on record

1

Unaddressed

14

Health-based

15

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2025. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Jun 2025 Unaddressed
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2023 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2023 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2023 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2018 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2018 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Oct 2017 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2017 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Oct 2016 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2015 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2015 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2015 Resolved

Recent enforcement actions

  • State action · SFJ Nov 2025
  • State action · SOX Feb 2024
  • State action · SFL Apr 2022
  • State action · SOX Sep 2018
  • State action · SFL Sep 2018
  • State action · SOX Apr 2016
  • State action · SFL Aug 2015
  • State action · SOX Apr 2015

This profile is built from EPA public records for system CA2810002 — 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.