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Public water system record

City of Calistoga

Serves Calistoga, Napa County, CA · 5,610 people served

Federal records show 7 health-based violations and 1 monitoring/reporting issue for City of Calistoga in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • CA2810002
  • CALISTOGA
  • CA
  • 5,610 served

System profile

Source water Surface water
ZIP 94515
EPA system ID CA2810002

Verify this system on EPA ECHO →

Health-based violations, last 10 years
7
Resolved
7
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
1

Key facts

  • City of Calistoga draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 74.4 µg/L, federal limit 60 µg/L (1.2 times the limit), 2023.
  • Most recent formal enforcement: compliance order (no penalty) by California, April 2022.
  • Record on file since 1995, with 7 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 1,662 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 67.35 µg/L, federal limit 60 µg/L (1.1 times the limit)
 220 Jul 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 74.4 µg/L, federal limit 60 µg/L (1.2 times the limit)
 220 Apr 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 71.95 µg/L, federal limit 60 µg/L (1.2 times the limit)
 220 Jan 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 220 Apr 1, 2018 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0621 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jan 1, 2018 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0622 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Oct 1, 2017 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0615 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jul 1, 2017 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Jun 1, 2025 Active

Full record since 1995

EPA's records for City of Calistoga go back to 1995. Before October 19, 2016 they list 7 health-based violations (7 resolved) and 1 monitoring or reporting violation.

Violations that began in Health-based Monitoring and reporting
1990s 1 0
2000s 1 0
2010 to October 18, 2016 5 1
October 19, 2016 to 2019 4 0
2020s 3 1

Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began October 2016, Resolved.

Show all 7 health-based violations before October 19, 2016
Contaminant Start date Status
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0635 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 Oct 1, 2016 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0995 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 Oct 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jul 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 Apr 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jan 1, 2015 Resolved
Total Coliform
Contaminant limit exceeded
 Dec 1, 2008 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Jun 1, 1995 Resolved

Enforcement actions

California regulators took 5 formal enforcement actions against City of Calistoga between 2011 and 2022. The most recent was a compliance order (no penalty) in April 2022.

Date By Action Violations covered
Apr 1, 2022 California Compliance order (no penalty) 3 violations (3 health-based): Haloacetic Acids (HAA5)
Sep 18, 2018 California Compliance order (no penalty) 4 violations (4 health-based): Haloacetic Acids (HAA5)
Aug 7, 2015 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Mar 9, 2015 California Compliance order (no penalty) 5 violations (5 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)
Feb 10, 2011 California Compliance order (no penalty) 1 violation: Total Coliform

What the violations mean

Haloacetic Acids (HAA5)

7 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Where the water comes from

City of Calistoga draws water from 1 surface water intake. It also buys water from City of Napa. 1 other community water system buys water from City of Calistoga. 3 other public water systems have emergency connections to City of Calistoga.

Buys water from

Community systems that buy water from it

Annual water quality report

City of Calistoga must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.

Certified drinking water labs by state EPA guidance for private wells