D34/100
ST. HELENA, CITY OF — Water Quality Report 2026
Serving 5,386 people · California
Water Source
Surface Water
County
—
System ID
CA2810004
Violations
14
Contaminant Test Results
EPA Violation History
4
Violations (last 5yr)
4
Unresolved
3
Health-Related
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: April 1, 2023 – June 30, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2023 – March 31, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Unresolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
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 ST. HELENA, CITY OF
Is ST. HELENA, CITY OF water safe to drink?
ST. HELENA, CITY OF water receives a grade of D (34/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 14 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ST. HELENA, CITY OF detected?
31 contaminants were tested in ST. HELENA, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does ST. HELENA, CITY OF have any EPA violations?
Yes, ST. HELENA, CITY OF has 14 EPA violation(s) on record, with the most recent in 2023. Violation types include MCL, MR, TT. 13 are health-based violations.
How many people does ST. HELENA, CITY OF serve?
ST. HELENA, CITY OF serves approximately 5,386 people, California. The system provides water to 1 community: St. Helena.
What type of water does ST. HELENA, CITY OF provide?
ST. HELENA, 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 CA2810004.
How does ST. HELENA, CITY OF compare to other utilities in California?
ST. HELENA, CITY OF scores 34/100 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.