Costa Mesa Water Quality
California
According to EPA SDWIS, Costa Mesa, California is served by 6 community water systems covering about 110,866 people. The same extract lists 61 health-based violation records, most recently coded 1032 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Costa Mesa, California is delivered through 6 EPA-regulated community water systems serving an estimated 110,866 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 61 violation records across the 6 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 5 distinct EPA contaminant codes: Manganese, Iron, PERFLUOROCTANE SULFONIC ACID (PFOS), Combined Radium (-226 and -228), Surface Water Treatment Rule. 3 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the California drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| MESA WATER DISTRICT | 110,000 | 0 | Clean |
| LAKE WOHLFORD RESORT | 250 | 1 | Health |
| PINE VALLEY TRAILER PARK | 200 | 54 | Health |
| ROLLING HILLS COMMUNITY, LLC | 200 | 4 | Health |
| BROOKSIDE MOBILE HOME PARK | 126 | 0 | Clean |
| RUSTIC ACRES MHP | 90 | 2 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| PINE VALLEY TRAILER PARK | Manganese | 2024-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2024-10-01 |
| PINE VALLEY TRAILER PARK | Iron | 2024-10-01 |
| PINE VALLEY TRAILER PARK | Iron | 2024-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2024-07-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2024-07-01 |
| PINE VALLEY TRAILER PARK | Iron | 2024-07-01 |
| PINE VALLEY TRAILER PARK | Iron | 2024-07-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2024-04-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2024-04-01 |
| PINE VALLEY TRAILER PARK | Iron | 2024-04-01 |
| PINE VALLEY TRAILER PARK | Iron | 2024-04-01 |
| ROLLING HILLS COMMUNITY, LLC | PERFLUOROCTANE SULFONIC ACID (PFOS) | 2024-01-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2024-01-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2023-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2023-07-01 |
| PINE VALLEY TRAILER PARK | Iron | 2023-07-01 |
| ROLLING HILLS COMMUNITY, LLC | PERFLUOROCTANE SULFONIC ACID (PFOS) | 2023-04-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2023-04-01 |
| PINE VALLEY TRAILER PARK | Iron | 2023-04-01 |
| ROLLING HILLS COMMUNITY, LLC | PERFLUOROCTANE SULFONIC ACID (PFOS) | 2023-01-01 |
| ROLLING HILLS COMMUNITY, LLC | PERFLUOROCTANE SULFONIC ACID (PFOS) | 2023-01-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2023-01-01 |
| PINE VALLEY TRAILER PARK | Iron | 2023-01-01 |
| RUSTIC ACRES MHP | Combined Radium (-226 and -228) | 2022-10-01 |
| RUSTIC ACRES MHP | Combined Radium (-226 and -228) | 2022-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2022-10-01 |
| PINE VALLEY TRAILER PARK | Iron | 2022-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2022-07-01 |
| PINE VALLEY TRAILER PARK | Iron | 2022-07-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2022-04-01 |
| PINE VALLEY TRAILER PARK | Iron | 2022-04-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2022-01-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2022-01-01 |
| PINE VALLEY TRAILER PARK | Iron | 2022-01-01 |
| PINE VALLEY TRAILER PARK | Iron | 2022-01-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-10-01 |
| PINE VALLEY TRAILER PARK | Iron | 2021-10-01 |
| PINE VALLEY TRAILER PARK | Iron | 2021-10-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-07-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-07-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-04-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-04-01 |
| PINE VALLEY TRAILER PARK | Iron | 2021-04-01 |
| PINE VALLEY TRAILER PARK | Iron | 2021-04-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-01-01 |
| PINE VALLEY TRAILER PARK | Manganese | 2021-01-01 |
| PINE VALLEY TRAILER PARK | Iron | 2021-01-01 |
| PINE VALLEY TRAILER PARK | Iron | 2021-01-01 |
What are Costa Mesa's health-based records for?
Costa Mesa's health-based violation records carry 5 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Manganese | 30 | 1 |
| Iron | 24 | 1 |
| Perfluoroctane Sulfonic Acid (pfos) | 4 | 1 |
| Combined Radium (-226 and -228) | 2 | 1 |
| Surface Water Treatment Rule | 1 | 1 |
TRI Facilities in Costa Mesa
| Facility | Total Releases |
|---|---|
| Griswold Industries | 10.1K lbs |
| Sanmina Corp | 306 lbs |
| Advanced Micro Instruments Inc | 158 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Costa Mesa, California? ▼
How many water violations does Costa Mesa have in this EPA extract? ▼
What contaminants were found in Costa Mesa water? ▼
How many water systems serve Costa Mesa? ▼
Where does Costa Mesa get its drinking water? ▼
Are there pollution sources near Costa Mesa? ▼
How does Costa Mesa compare in California?
Of the 909 California places with at least one community water system on file, Costa Mesa ranks #101 by number of systems (6).
Either side of it: Blythe (6), Carmel Valley (6), El Centro (6), Escondido (6)
About This Data
Figures here are the current EPA SDWIS extract joined to the 6 community water systems whose service area lists Costa Mesa, ranked against the 909 California places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.