Water quality in San Francisco, California
San Francisco is in San Francisco County. 8 active public water systems serve the county; 1 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in San Francisco County
4 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Sfpuc City Distribution Division |
848,019 | 0 | 32.3 mi | |
| Treasure Island |
3,864 | 0 | 36.9 mi | |
| Hhw&p Moccasin Compound-Sfpuc |
410 | 1 | 149.4 mi | |
| San Francisco Regional Water System |
600 | 0 | — |
Non-community systems in San Francisco County (3: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
San Francisco International Airport |
42,400 | 0 | 0 | |
|
Hhw&p-Early Intake Cpd-Sfpuc |
30 | 0 | 0 | |
|
Hhw&p-O'shaughnessy Dam Cpd-Sfpuc |
495 | 0 | 0 |
About this data
Water systems are matched to San Francisco County, nearest to San Francisco first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.