Tapcensus

Water quality for ZIP code 92021

ZIP 92021 covers Harbison Canyon, Crest, El Cajon, Bostonia, Lakeside, and Granite Hills 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 7.0 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
Padre Dam Mwd
 93,980 0 under 0.1 mi
Lakeside WD
 35,500 1 4.2 mi
Alpine Oaks Estates LLC
 185 0 7.6 mi
Willowside Terrace Water Association
 100 2 8.6 mi
San Diego County Water Authority
 0 0 9.9 mi
Otay Water District
 242,155 0 12.1 mi
Ramona Municipal WD
 36,455 0 12.7 mi
MHC TT Inc. (dba Pio Pico)
 23 0 13.0 mi
Poway, City of
Poway		 49,888 0 13.8 mi
Descanso Community Water District
 870 3 14.9 mi
Sunrise Estates Mutual Water Company
 150 2 15.8 mi
San Diego, City of
San Diego		 1,408,937 0 15.8 mi
Rancho Santa Teresa MW Co.
 102 2 16.9 mi
Sweetwater Authority
 184,915 0 17.3 mi
Heavenly Oaks
 300 1 17.5 mi
San Pasqual Academy
 298 0 17.6 mi
Barrett Lake MH and RV LLC
 300 1 18.2 mi
Pine Valley Trailer Park
 200 0 18.2 mi
North Peak Mutual Water Company
 294 0 18.8 mi
Rincon del Diablo Mwd (id-A)
 5,016 0 19.3 mi
Guatay Mutual Benefit Corporation
 100 4 19.6 mi
Pine Valley Bible Conference Center
 50 0 19.7 mi
Cuyamaca Water District
 160 0 19.8 mi
Pine Valley Mutual WC
 2,574 1 19.9 mi
Pine Hills Mutual Water Company
 380 2 20.1 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
EL Monte County Park
 100 0 0
City of San Diego EL Capitan Reservoir
 300 0 0
Oakoasis Open Space Preserve
 25 1 0
Alpine American Legion
 100 1 0
Diamond Jack's RV Ranch
 115 1 1
Sycamore Canyon / Goodan Ranch
 50 0 0
Skyline Ranch RV Park & Campground
 45 0 0
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
Descanso Fire Station
 34 0 0
Descanso Junction
 100 1 0
All Saints Retreat and Formation Center
 72 2 1
Ramona Oaks RV Resort
 250 4 0
South Bay Rod & Gun Club Inc.
 18,900 1 0
East County Transitional Living Center
 50 1 0
Bandy Canyon Ranch Corp
 3,564 0 0
Thousand Trails Oakzanita Inc.
 404 0 0
ND Daniel's Investment LLC
 106 0 0
Cuyamaca SP Green Valley
 455 0 0
San Pasqual Battlefield State Park
 44 0 0
The Oaks Venture, LLC
 220 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Sutherland Reservoir Recreation Area
 300 1 0
Cuyamaca Outdoor School
 20 0 0
Camp Winacka
 250 0 0
Hodges Reservoir Recreation Area
 200 0 0
William Heise County Park
 850 1 0
Potrero Elementary School
 300 0 0
Whispering Winds Catholic Conference Cen
 164 0 0
Auerbach Farms
 68 0 0
Apple Water IS Good
 25 1 0
Calvary Chapel Julian
 101 1 0
Santa Ysabel Nature Center
San Diego 		248 0 0
Spencer Valley School District
 40 2 0
Potrero General Store
 75 0 0
City of San Diego, Camp Morena
 200 0 0
Lake Morena County Park
 300 0 0
Potrero County Park
 100 1 0
Pinezanita Inc.
 400 0 0
Pinecrest
 70 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Jess Martin County Park
 150 1 0
Tecate Vista Mutual Water Company
 204 1 1
Sacred Mountain Inn
 30 1 0
KQ Ranch Resort
 400 0 0
Muir Industries Inc.
 70 0 0
Tecate Supermarket
 25 0 0
Gsa Tecate Port of Entry
 70 1 0
Nickel Beer Water Company
San Diego 		100 0 0
Mountain Empire High School
 1,000 0 0
Julian Oaks Camp
 72 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.