B77/100
CITY OF ANTIOCH — Water Quality Report 2026
Serving 115,074 people · California
Water Source
Surface Water
County
—
System ID
CA0710001
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 104.00 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1997.
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 CITY OF ANTIOCH
Is CITY OF ANTIOCH water safe to drink?
CITY OF ANTIOCH water receives a grade of B (77/100), which is considered good. Out of 77 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CITY OF ANTIOCH detected?
77 contaminants were tested in CITY OF ANTIOCH's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does CITY OF ANTIOCH have any EPA violations?
Yes, CITY OF ANTIOCH has 3 EPA violation(s) on record, with the most recent in 1997. Violation types include TT, MCL. 3 are health-based violations.
How many people does CITY OF ANTIOCH serve?
CITY OF ANTIOCH serves approximately 115,074 people, California. The system provides water to 1 community: Antioch.
What type of water does CITY OF ANTIOCH provide?
CITY OF ANTIOCH 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 CA0710001.
How does CITY OF ANTIOCH compare to other utilities in California?
CITY OF ANTIOCH scores 77/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our California state page for a full comparison of water systems.