D29/100
CALISTOGA, CITY OF — Water Quality Report 2026
Serving 5,610 people · California
Water Source
Surface Water
County
—
System ID
CA2810002
Violations
15
Contaminant Test Results
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
3
Health-Related
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: April 1, 2023 – June 30, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2023 – March 31, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CALISTOGA, CITY OF
Is CALISTOGA, CITY OF water safe to drink?
CALISTOGA, CITY OF water receives a grade of D (29/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 15 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CALISTOGA, CITY OF detected?
38 contaminants were tested in CALISTOGA, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CALISTOGA, CITY OF have any EPA violations?
Yes, CALISTOGA, CITY OF has 15 EPA violation(s) on record, with the most recent in 2023. Violation types include MCL, MR, TT. 14 are health-based violations.
How many people does CALISTOGA, CITY OF serve?
CALISTOGA, CITY OF serves approximately 5,610 people, California. The system provides water to 1 community: Calistoga.
What type of water does CALISTOGA, CITY OF provide?
CALISTOGA, CITY OF sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA2810002.
How does CALISTOGA, CITY OF compare to other utilities in California?
CALISTOGA, CITY OF scores 29/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.