Water quality for ZIP code 94188
ZIP 94188 covers San Francisco in San Francisco County, California, one of 28 ZIP codes in the 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, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Treasure Island |
3,864 | 0 | |
| Presidio of San Francisco |
3,500 | 0 | |
| San Francisco Regional Water System |
600 | 0 | |
| Hhw&p Moccasin Compound-Sfpuc |
410 | 1 |
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-O'shaughnessy Dam Cpd-Sfpuc |
495 | 0 | 0 | |
|
Hhw&p-Early Intake Cpd-Sfpuc |
30 | 0 | 0 |
About this data
Water systems are matched to San Francisco County, the county this ZIP code lies in, largest 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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. Retrieved from ECHO on Oct 11, 2026.