Tapcensus

Water quality for ZIP code 91942

ZIP 91942 covers La Mesa and 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

Helix Water District CA3710010 · Community water system · Surface water
Serves 277,918 people Rules violated, past 3 years 0 Last sanitary survey Feb 25, 2026 Distance 3.0 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 3.2 mi
San Diego, City of
San Diego		 1,408,937 0 7.9 mi
Lakeside WD
 35,500 1 9.0 mi
Sweetwater Authority
 184,915 0 9.2 mi
Otay Water District
 242,155 0 9.4 mi
Padre Dam Mwd
 93,980 0 9.8 mi
Nas North Island & Nab Coronado
 421 0 12.0 mi
MHC TT Inc. (dba Pio Pico)
 23 0 13.0 mi
Cal-Am Water Coronado
 106,000 1 13.2 mi
Poway, City of
Poway		 49,888 0 14.3 mi
Alpine Oaks Estates LLC
 185 0 16.8 mi
Willowside Terrace Water Association
 100 2 17.9 mi
Ramona Municipal WD
 36,455 0 18.4 mi
Del Mar, City of
Del Mar		 3,950 0 19.0 mi
Santa FE I.d.
 21,539 0 19.9 mi
Sunrise Estates Mutual Water Company
 150 2 20.2 mi
Rincon del Diablo Mwd (id-A)
 5,016 0 20.7 mi
Olivenhain Mwd
 86,458 0 20.9 mi
Del Dios Mutual Water Company
 330 3 21.2 mi
San Pasqual Academy
 298 0 21.6 mi
Barrett Lake MH and RV LLC
 300 1 22.0 mi
Rincon del Diablo Mwd (id-1)
 28,427 0 23.6 mi
San Dieguito WD
 40,405 1 24.1 mi
Descanso Community Water District
 870 3 24.3 mi
Escondido, City of
Escondido		 137,044 0 24.4 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
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
Skyline Ranch RV Park & Campground
 45 0 0
City of San Diego EL Capitan Reservoir
 300 0 0
Alpine American Legion
 100 1 0
South Bay Rod & Gun Club Inc.
 18,900 1 0
East County Transitional Living Center
 50 1 0
Hodges Reservoir Recreation Area
 200 0 0
Bandy Canyon Ranch Corp
 3,564 0 0
San Pasqual Battlefield State Park
 44 0 0
ND Daniel's Investment LLC
 106 0 0
Questhaven Municipal Water District
 81 2 0
Descanso Fire Station
 34 0 0
Descanso Junction
 100 1 0
Ramona Oaks RV Resort
 250 4 0
All Saints Retreat and Formation Center
 72 2 1
Sutherland Reservoir Recreation Area
 300 1 0
Potrero Elementary School
 300 0 0
Tecate Vista Mutual Water Company
 204 1 1
Muir Industries Inc.
 70 0 0
Tecate Supermarket
 25 0 0
Potrero General Store
 75 0 0
Gsa Tecate Port of Entry
 70 1 0
The Oaks Venture, LLC
 220 0 0
Thousand Trails Oakzanita Inc.
 404 0 0
Potrero County Park
 100 1 0
Daley Ranch
 200 0 0
Cuyamaca SP Green Valley
 455 0 0
Camp Winacka
 250 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Cuyamaca Outdoor School
 20 0 0
Lake Morena County Park
 300 0 0
City of San Diego, Camp Morena
 200 0 0
Auerbach Farms
 68 0 0
William Heise County Park
 850 1 0
Santa Ysabel Nature Center
San Diego 		248 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Mountain Empire High School
 1,000 0 0
Apple Water IS Good
 25 1 0
Spencer Valley School District
 40 2 0
Calvary Chapel Julian
 101 1 0
Whispering Winds Catholic Conference Cen
 164 0 0
Mountain Empire R.v. Park and Campground
 23 0 0
Pinezanita Inc.
 400 0 0
Sacred Mountain Inn
 30 1 0
Jess Martin County Park
 150 1 0
Pinecrest
 70 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.