Water quality for ZIP code 94018
ZIP 94018 covers El Granada in San Mateo County, California, one of 30 ZIP codes in the county. 51 active public water systems serve the county; 15 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in San Mateo County
35 systems, largest firstNon-community systems in San Mateo County (15: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
San Mateo County Memorial Park |
1,790 | 0 | 0 | |
|
Csp Ano Nuevo State Park |
709 | 0 | 0 | |
|
Optimists Volunteers for Youth |
205 | 1 | 0 | |
|
Csp Portola State Park |
172 | 0 | 0 | |
|
Butano Girl Scout Camp |
154 | 0 | 0 | |
|
Butano State Park Csp |
121 | 0 | 0 | |
|
Harley Farms Goat Dairy |
113 | 0 | 0 | |
|
Pigeon Point Hostel |
67 | 1 | 1 | |
|
Skylawn Memorial Park (skylawn Inc) |
50 | 1 | 1 | |
|
Martins Beach Water System |
49 | 1 | 0 | |
|
UC Elkus Ranch |
34 | 0 | 0 | |
|
Costanoa Campground |
33 | 1 | 0 | |
|
Gazos Creek Beach House |
33 | 0 | 0 | |
|
LA Honda Center |
33 | 0 | 0 | |
|
San Gregorio Company |
32 | 1 | 0 |
About this data
Water systems are matched to San Mateo 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.