Water quality for ZIP code 92136
ZIP 92136 covers San Diego and National City in San Diego County, California, one of 115 ZIP codes in the county. 198 active public water systems serve the county; 83 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in San Diego County
81 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Helix Water District |
277,918 | 0 | |
| Otay Water District |
242,155 | 0 | |
| Sweetwater Authority |
184,915 | 0 | |
| Oceanside, City of Oceanside |
174,340 | 0 | |
| Escondido, City of Escondido |
137,044 | 0 | |
| Vista Irrigation District |
134,501 | 0 | |
| Vallecitos WD |
114,700 | 1 | |
| Cal-Am Water Coronado |
106,000 | 1 | |
| Carlsbad Mwd |
96,371 | 0 | |
| Padre Dam Mwd |
93,980 | 0 | |
| Olivenhain Mwd |
86,458 | 0 | |
| Poway, City of Poway |
49,888 | 0 | |
| Camp Pendleton (south) |
44,555 | 0 | |
| San Dieguito WD |
40,405 | 1 | |
| Ramona Municipal WD |
36,455 | 0 | |
| Lakeside WD |
35,500 | 1 | |
| Fallbrook Pud |
35,237 | 0 | |
| Valley Center Mwd |
30,166 | 0 | |
| Rincon del Diablo Mwd (id-1) |
28,427 | 0 | |
| Rainbow Municipal WD |
23,536 | 0 | |
| Santa FE I.d. |
21,539 | 0 | |
| Camp Pendleton (north) |
11,576 | 0 | |
| Rincon del Diablo Mwd (id-A) |
5,016 | 0 | |
| Del Mar, City of Del Mar |
3,950 | 0 | |
| Borrego WD |
3,429 | 1 |
Non-community systems in San Diego County (116: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to San Diego 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.