Public water system record
Mesa Water District
Serves Costa Mesa, Orange County, CA · 110,000 people served
Federal records show no health-based violations and no monitoring or reporting issues for Mesa Water District 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
- Mesa Water District draws water from 9 wells.
- Most recent formal enforcement: compliance order (no penalty) by California, August 2020.
- Record on file since 2000, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 25,358 service lines.
Check whether Mesa Water District 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 2000
EPA's records for Mesa Water District go back to 2000. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 1 monitoring or reporting violation.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 1 | 0 |
| 2010 to October 18, 2016 | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began July 2000, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2000 | Resolved |
Enforcement actions
California regulators took 2 formal enforcement actions against Mesa Water District between 2000 and 2020. The most recent was a compliance order (no penalty) in August 2020.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Aug 24, 2020 | California | Compliance order (no penalty) | 1 violation: Combined Uranium |
| Jul 14, 2000 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
Where the water comes from
Mesa Water District draws water from 9 wells. It also buys water from Metropolitan Water Dist. of So. Cal. It also has emergency connections to City of Santa Ana, City of Newport Beach and Irvine Ranch Water District. 2 other public water systems have emergency connections to Mesa Water District.
Buys water from
- Metropolitan Water Dist. of So. Cal. La Verne, CA
Emergency or part-time connections to
- City of Santa Ana Santa Ana, CA
- City of Newport Beach Newport Beach, CA
- Irvine Ranch Water District Irvine, CA
Annual water quality report
Mesa Water District 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