Water quality for ZIP code 92123
ZIP 92123 covers San Diego 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
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in San Diego County
81 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| San Diego County Water Authority |
0 | 0 | 5.6 mi | |
| Nas North Island & Nab Coronado |
421 | 0 | 8.5 mi | |
| Helix Water District |
277,918 | 0 | 9.7 mi | |
| Sweetwater Authority |
184,915 | 0 | 11.6 mi | |
| Del Mar, City of Del Mar |
3,950 | 0 | 13.1 mi | |
| Lakeside WD |
35,500 | 1 | 13.2 mi | |
| Poway, City of Poway |
49,888 | 0 | 13.6 mi | |
| Cal-Am Water Coronado |
106,000 | 1 | 14.0 mi | |
| Santa FE I.d. |
21,539 | 0 | 15.0 mi | |
| Otay Water District |
242,155 | 0 | 15.5 mi | |
| Padre Dam Mwd |
93,980 | 0 | 15.6 mi | |
| Olivenhain Mwd |
86,458 | 0 | 16.8 mi | |
| Del Dios Mutual Water Company |
330 | 3 | 18.4 mi | |
| San Dieguito WD |
40,405 | 1 | 18.8 mi | |
| Rincon del Diablo Mwd (id-A) |
5,016 | 0 | 19.4 mi | |
| MHC TT Inc. (dba Pio Pico) |
23 | 0 | 19.4 mi | |
| Ramona Municipal WD |
36,455 | 0 | 20.5 mi | |
| Rincon del Diablo Mwd (id-1) |
28,427 | 0 | 21.1 mi | |
| San Pasqual Academy |
298 | 0 | 22.0 mi | |
| Escondido, City of Escondido |
137,044 | 0 | 22.8 mi | |
| Alpine Oaks Estates LLC |
185 | 0 | 23.1 mi | |
| Willowside Terrace Water Association |
100 | 2 | 24.1 mi | |
| Vallecitos WD |
114,700 | 1 | 24.2 mi | |
| Carlsbad Mwd |
96,371 | 0 | 24.3 mi | |
| Oakvale Park |
260 | 3 | 26.1 mi |
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, nearest to the ZIP code's centre 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.
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.