Tapcensus

Water quality for ZIP code 92120

ZIP 92120 covers San Diego and La Mesa 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

San Diego, City of CA3710020 · Community water system · Surface water · San Diego
Serves 1,408,937 people Rules violated, past 3 years 0 Last sanitary survey Apr 15, 2026 Distance 4.9 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in San Diego County

81 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
San Diego County Water Authority
 0 0 2.6 mi
Helix Water District
 277,918 0 5.9 mi
Sweetwater Authority
 184,915 0 10.0 mi
Nas North Island & Nab Coronado
 421 0 10.2 mi
Lakeside WD
 35,500 1 10.3 mi
Padre Dam Mwd
 93,980 0 12.1 mi
Otay Water District
 242,155 0 12.1 mi
Poway, City of
Poway		 49,888 0 13.3 mi
Cal-Am Water Coronado
 106,000 1 13.4 mi
MHC TT Inc. (dba Pio Pico)
 23 0 16.0 mi
Del Mar, City of
Del Mar		 3,950 0 16.1 mi
Santa FE I.d.
 21,539 0 17.3 mi
Olivenhain Mwd
 86,458 0 18.6 mi
Ramona Municipal WD
 36,455 0 18.8 mi
Del Dios Mutual Water Company
 330 3 19.4 mi
Alpine Oaks Estates LLC
 185 0 19.5 mi
Rincon del Diablo Mwd (id-A)
 5,016 0 19.6 mi
Willowside Terrace Water Association
 100 2 20.5 mi
San Pasqual Academy
 298 0 21.3 mi
San Dieguito WD
 40,405 1 21.5 mi
Rincon del Diablo Mwd (id-1)
 28,427 0 22.0 mi
Escondido, City of
Escondido		 137,044 0 23.2 mi
Sunrise Estates Mutual Water Company
 150 2 23.3 mi
Barrett Lake MH and RV LLC
 300 1 25.1 mi
Rancho Santa Teresa MW Co.
 102 2 25.2 mi
All 82 community water systems in San Diego County
Non-community systems in San Diego County (116: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Sycamore Canyon / Goodan Ranch
 50 0 0
Oakoasis Open Space Preserve
 25 1 0
EL Monte County Park
 100 0 0
Diamond Jack's RV Ranch
 115 1 1
City of San Diego EL Capitan Reservoir
 300 0 0
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
Skyline Ranch RV Park & Campground
 45 0 0
Hodges Reservoir Recreation Area
 200 0 0
Alpine American Legion
 100 1 0
Bandy Canyon Ranch Corp
 3,564 0 0
San Pasqual Battlefield State Park
 44 0 0
Questhaven Municipal Water District
 81 2 0
South Bay Rod & Gun Club Inc.
 18,900 1 0
East County Transitional Living Center
 50 1 0
ND Daniel's Investment LLC
 106 0 0
Ramona Oaks RV Resort
 250 4 0
Descanso Fire Station
 34 0 0
Daley Ranch
 200 0 0
Descanso Junction
 100 1 0
All Saints Retreat and Formation Center
 72 2 1
Sutherland Reservoir Recreation Area
 300 1 0
The Oaks Venture, LLC
 220 0 0
Potrero Elementary School
 300 0 0
Tecate Vista Mutual Water Company
 204 1 1
Thousand Trails Oakzanita Inc.
 404 0 0
Muir Industries Inc.
 70 0 0
Tecate Supermarket
 25 0 0
Gsa Tecate Port of Entry
 70 1 0
Potrero General Store
 75 0 0
Camp Winacka
 250 0 0
Potrero County Park
 100 1 0
Cuyamaca SP Green Valley
 455 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Cuyamaca Outdoor School
 20 0 0
Auerbach Farms
 68 0 0
Santa Ysabel Nature Center
San Diego 		248 0 0
Apple Water IS Good
 25 1 0
William Heise County Park
 850 1 0
Spencer Valley School District
 40 2 0
Calvary Chapel Julian
 101 1 0
Lake Morena County Park
 300 0 0
City of San Diego, Camp Morena
 200 0 0
Whispering Winds Catholic Conference Cen
 164 0 0
Sacred Mountain Inn
 30 1 0
Jess Martin County Park
 150 1 0
Pinezanita Inc.
 400 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Pinecrest
 70 0 0
Mountain Empire High School
 1,000 0 0
Nickel Beer Water Company
San Diego 		100 0 0
All non-community systems
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.