C57/100
GONZALES, CITY OF — Water Quality Report 2026
Serving 8,327 people · California
Water Source
Groundwater
County
—
System ID
CA2710007
Violations
11
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 88.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to conduct Level 1 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: August 9, 2024 – November 8, 2024Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
TIER 3Resolved
Failed to conduct Level 1 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: August 7, 2024 – November 8, 2024Rule: Consumer Confidence RuleEnforcement: 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 GONZALES, CITY OF
Is GONZALES, CITY OF water safe to drink?
GONZALES, CITY OF water receives a grade of C (57/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 11 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has GONZALES, CITY OF detected?
52 contaminants were tested in GONZALES, CITY OF's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does GONZALES, CITY OF have any EPA violations?
Yes, GONZALES, CITY OF has 11 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MCL. 6 are health-based violations.
How many people does GONZALES, CITY OF serve?
GONZALES, CITY OF serves approximately 8,327 people, California. The system provides water to 1 community: Gonzales.
What type of water does GONZALES, CITY OF provide?
GONZALES, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA2710007.
How does GONZALES, CITY OF compare to other utilities in California?
GONZALES, CITY OF scores 57/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our California state page for a full comparison of water systems.