San Diego Water Quality
California
According to EPA SDWIS, San Diego, California is served by 15 community water systems covering about 1,424,196 people. The same extract lists 32 health-based violation records, most recently coded 2806 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in San Diego, California is delivered through 15 EPA-regulated community water systems serving an estimated 1,424,196 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 32 violation records across the 15 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 6 distinct EPA contaminant codes: PERFLUOROCTANOIC ACID (PFOA), LEAD AND COPPER RULE REVISIONS, Revised Total Coliform Rule, Lead and Copper Rule, Surface Water Treatment Rule and 1 others. 50 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 |
|---|---|---|---|
| SAN DIEGO, CITY OF | 1,385,379 | 0 | Clean |
| NAS NORTH ISLAND & NAB CORONADO | 36,990 | 0 | Clean |
| BUTTERFIELD RANCH | 353 | 13 | Health |
| NORTHCREST MOBILE HOME PARK | 250 | 0 | Clean |
| STONEYBROOKE VILLAGE MHP | 250 | 0 | Clean |
| COTTONWOOD RIDGE MANUFACTURED HOUSING CO | 205 | 2 | Health |
| HIDDEN VALLEY OWNER LLC | 200 | 2 | Health |
| PINE GROVE MOBILE HOME PARK | 142 | 0 | Clean |
| PORT OF CALL - WEST | 105 | 2 | Health |
| TALL TIMBER TRAVEL TRAILER PARK | 95 | 0 | Clean |
| SUNCREST MHP | 65 | 0 | Clean |
| CHALET MOBILE HOME PARK | 60 | 0 | Clean |
| SUNTREE HOLLOW MOBILE HOME COURT | 60 | 12 | Health |
| HARDYVILLE ON THE RIVER | 42 | 0 | Clean |
| SAN DIEGO COUNTY WATER AUTHORITY | 0 | 1 | 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 |
|---|---|---|
| PORT OF CALL - WEST | PERFLUOROCTANOIC ACID (PFOA) | 2025-04-01 |
| BUTTERFIELD RANCH | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| COTTONWOOD RIDGE MANUFACTURED HOUSING CO | Revised Total Coliform Rule | 2023-01-01 |
| COTTONWOOD RIDGE MANUFACTURED HOUSING CO | Revised Total Coliform Rule | 2023-01-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-07-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-07-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-07-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-07-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-06-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-06-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-06-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-06-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-05-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-05-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-05-01 |
| BUTTERFIELD RANCH | Revised Total Coliform Rule | 2022-05-01 |
| PORT OF CALL - WEST | Lead and Copper Rule | 2020-04-01 |
| SAN DIEGO COUNTY WATER AUTHORITY | Surface Water Treatment Rule | 2019-04-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| SUNTREE HOLLOW MOBILE HOME COURT | Groundwater Rule | 2016-12-01 |
| HIDDEN VALLEY OWNER LLC | Lead and Copper Rule | 2006-03-04 |
| HIDDEN VALLEY OWNER LLC | Lead and Copper Rule | 2005-11-04 |
What are San Diego's health-based records for?
San Diego's health-based violation records carry 6 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 |
|---|---|---|
| Revised Total Coliform Rule | 14 | 2 |
| Groundwater Rule | 12 | 1 |
| Lead and Copper Rule | 3 | 2 |
| Surface Water Treatment Rule | 1 | 1 |
| Perfluoroctanoic Acid (pfoa) | 1 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in San Diego
| Facility | Total Releases |
|---|---|
| General Dynamics (nassco) | 812.7K lbs |
| Bae Systems San Diego Ship Repair | 397.8K lbs |
| U.S. Naval Air Station North Island | 206.9K lbs |
| US Marine Corps Air Station Miramar | 151.3K lbs |
| US Cbp Border Patrol Firearms Range Be # CA0180 | 64.8K lbs |
| Solar Turbines Inc Harbor Drive | 35.5K lbs |
| Integrated Dna Technologies | 32.6K lbs |
| Polypeptide Laboratories San Diego | 31.8K lbs |
| San Diego Galvanizing Inc | 16.0K lbs |
| US Naval Submarine Base San Diego | 15.0K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in San Diego, California? ▼
How many water violations does San Diego have in this EPA extract? ▼
What contaminants were found in San Diego water? ▼
How many water systems serve San Diego? ▼
Where does San Diego get its drinking water? ▼
Are there pollution sources near San Diego? ▼
How does San Diego compare in California?
Of the 909 California places with at least one community water system on file, San Diego ranks #26 by number of systems (15).
Either side of it: Napa (16), Rosemead (15), Watsonville (15), Arroyo Grande (13)
About This Data
Figures here are the current EPA SDWIS extract joined to the 15 community water systems whose service area lists San Diego, 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.