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Calistoga, CA Tap Water Quality 2026

Water quality report for Calistoga, CA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Calistoga's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Calistoga, City Of PWSID: CA2810002 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS was detected below the federal limit.

B

Calistoga earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: not detected
PFAS detected below the federal limit
13 violations since 2015, 12 health-based
No violations currently open
Calistoga's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of California utilities
Population Served
5228
~2229 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
13 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Unaddressed
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 67.35 UG/L 0.060 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 74.4 UG/L 0.060 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 71.95 UG/L 0.060 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0621 MG/L 0.060 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0622 MG/L 0.060 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0615 MG/L 0.060 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0635 MG/L 0.060 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.0995 MG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.092 MG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

13 violations are on record since 2015, of which 12 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Calistoga, City Of
PWSID CA2810002
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 5,228
Service connections 2,229
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Calistoga tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Calistoga water have PFAS? ▼
PFAS was detected but stayed below the federal limit.
Who supplies water to Calistoga? ▼
Calistoga, City Of (PWSID CA2810002). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2018-04-19. No significant deficiencies were recorded.

What Should Calistoga Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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