Water Quality: San Francisco, CA
4 water systems • 3,643 people served
Multiple Health ViolationsWater Quality Summary
San Francisco is served by 4 public water systems with a combined service population of 3,643 people, and has 197 EPA Safe Drinking Water Act violations on record. Critically, 93 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. San Francisco's violation count is 310% above the national average for California. Contaminants associated with violations include Chlorine Dioxide, Fecal Coliform.
Contaminants Found
Can cause anemia in infants and young children; may cause nervous system effects at high levels.
Common source: Water treatment disinfectant used to control taste, odor, and microorganisms
EPA limit: 0.8 mg/L
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Water Systems Serving San Francisco
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| PRESIDIO OF SAN FRANCISCO | CA3810700 | Surface Water | 3,500 | 0 |
| SIX ACRES WATER COMPANY | CA4900608 | Surface Water | 66 | 113 |
| SONOMA COUNTY MUTUAL WATER COMPANY | CA4900640 | Surface Water | 40 | 83 |
| SUNRISE MOBILEHOME PARK | CA4500104 | Groundwater | 37 | 1 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in California
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.