Public water system record
City of Antioch
Serves Antioch, Contra Costa County, CA · 115,074 people served
Federal records show no health-based violations and no monitoring or reporting issues for City of Antioch in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- City of Antioch draws water from 1 surface water intake and 1 reservoir.
- Most recent formal enforcement: compliance order (no penalty) by California, December 1992.
- Record on file since 1992, with 3 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 33,821 service lines.
Check whether City of Antioch serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Full record since 1992
EPA's records for City of Antioch go back to 1992. Before October 19, 2016 they list 3 health-based violations (3 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 0 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began January 1997, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 1997 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1992 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 1992 | Resolved |
Enforcement actions
California regulators took 1 formal enforcement action against City of Antioch in 1992. The most recent was a compliance order (no penalty) in December 1992.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Dec 17, 1992 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
Where the water comes from
City of Antioch draws water from 1 surface water intake and 1 reservoir. It also buys water from Contra Costa Water District and Randall-Bold Water Treatment Plant. It also has emergency connections to City of Pittsburg and Diablo Water District.
Buys water from
- Contra Costa Water District Concord, CA
- Randall-Bold Water Treatment Plant Concord, CA
Emergency or part-time connections to
- City of Pittsburg Pittsburg, CA
- Diablo Water District Oakley, CA
Annual water quality report
City of Antioch 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.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
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