San Francisco Water Quality
California
According to EPA SDWIS, San Francisco, California is served by 10 community water systems covering about 5,939 people. The same extract lists 97 health-based violation records, most recently coded 0400 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in San Francisco, California is delivered through 10 EPA-regulated community water systems serving an estimated 5,939 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 97 violation records across the 10 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: Stage 1 Disinfectants and Disinfection Byproducts Rule, Groundwater Rule, Surface Water Treatment Rule. 6 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 |
|---|---|---|---|
| PRESIDIO OF SAN FRANCISCO | 3,500 | 0 | Clean |
| JOSHUA VALLEY UTILITY COMPANY | 1,500 | 0 | Clean |
| MILE HIGH MOBILE HOME PARK | 209 | 0 | Clean |
| RIDGEWOOD MOBILE HOME PARK | 196 | 0 | Clean |
| BY WAY MOBILE HOME PARK | 150 | 0 | Clean |
| LONGVIEW MOBILE HOME PARK | 147 | 2 | Health |
| THE HIDEOUT AT GLENWOOD SPRINGS | 94 | 2 | Health |
| SIX ACRES WATER COMPANY | 66 | 10 | Health |
| SONOMA COUNTY MUTUAL WATER COMPANY | 40 | 83 | Health |
| SUNRISE MOBILEHOME PARK | 37 | 0 | Clean |
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 |
|---|---|---|
| LONGVIEW MOBILE HOME PARK | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2025-02-01 |
| LONGVIEW MOBILE HOME PARK | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2025-02-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2024-07-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2024-07-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2024-06-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2024-06-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2022-11-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2022-10-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2022-09-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2021-08-01 |
| SIX ACRES WATER COMPANY | Groundwater Rule | 2021-08-01 |
| SIX ACRES WATER COMPANY | Surface Water Treatment Rule | 2020-07-29 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2020-07-23 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-08-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-07-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-06-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-05-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-04-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-03-01 |
| THE HIDEOUT AT GLENWOOD SPRINGS | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2019-02-01 |
| THE HIDEOUT AT GLENWOOD SPRINGS | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2019-02-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-02-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2019-01-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-12-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-11-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-10-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-09-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-08-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-07-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-06-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-05-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-04-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-03-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-02-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2018-01-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-12-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-11-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-10-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-09-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-08-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-07-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-06-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-05-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-04-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-03-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-02-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2017-01-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2016-12-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2016-11-01 |
| SONOMA COUNTY MUTUAL WATER COMPANY | Surface Water Treatment Rule | 2016-10-01 |
What are San Francisco's health-based records for?
San Francisco's health-based violation records carry 3 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 |
|---|---|---|
| Surface Water Treatment Rule | 84 | 2 |
| Groundwater Rule | 9 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 4 | 2 |
TRI Facilities in San Francisco
| Facility | Total Releases |
|---|---|
| Golden Gate National Recreation Area | 89 lbs |
| Central Concrete Supply Co. Inc. - Bode | 75 lbs |
| US Mint San Francisco Ca | 7 lbs |
| Treasure Island | 0 lbs |
| R.j. McGlennon Co Inc. | 0 lbs |
| San Francisco (a) | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in San Francisco, California? ▼
How many water violations does San Francisco have in this EPA extract? ▼
What contaminants were found in San Francisco water? ▼
How many water systems serve San Francisco? ▼
Where does San Francisco get its drinking water? ▼
Are there pollution sources near San Francisco? ▼
How does San Francisco compare in California?
Of the 909 California places with at least one community water system on file, San Francisco ranks #54 by number of systems (10).
Either side of it: Ojai (10), Pauma Valley (10), Sebastopol (10), Tahoe City (10)
About This Data
Figures here are the current EPA SDWIS extract joined to the 10 community water systems whose service area lists San Francisco, 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.