Tapcensus

Water quality in San Diego, California

San Diego is in San Diego County. 198 active public water systems serve the county; 83 had an EPA violation in the past three years.

Most likely your provider

Willowside Terrace Water Association CA3701995 · Community water system · Ground water
Serves 100 people Rules violated, past 3 years 2 Unresolved 1 Distance 5.9 mi
View system details EPA facility report

Other community water systems in San Diego County

81 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Alpine Oaks Estates LLC
 185 0 6.4 mi
Descanso Community Water District
 870 3 6.8 mi
North Peak Mutual Water Company
 294 0 8.1 mi
Cuyamaca Water District
 160 0 8.7 mi
Heavenly Oaks
 300 1 9.3 mi
Pine Hills Mutual Water Company
 380 2 9.9 mi
LA Cima Fire Center
 60 0 9.9 mi
Pine Valley Trailer Park
 200 0 10.1 mi
H & J Water Company
 86 1 10.6 mi
Richardson Beardsley Park Inc.
 30 1 10.9 mi
Padre Dam Mwd
 93,980 0 11.1 mi
Pine Valley Bible Conference Center
 50 0 11.5 mi
Rancho Santa Teresa MW Co.
 102 2 11.7 mi
Guatay Mutual Benefit Corporation
 100 4 12.1 mi
Pine Valley Mutual WC
 2,574 1 12.1 mi
Julian Community Services District
 617 3 12.6 mi
Wynola Water District
 140 2 12.7 mi
Ramona Municipal WD
 36,455 0 12.8 mi
Majestic Pines Community SD
 1,768 1 12.8 mi
Lakeside WD
 35,500 1 13.0 mi
Camp Stevens
 28 1 13.2 mi
Butterfield Ranch
 350 2 16.1 mi
Laguna Mountain Mutual Water Co.
 100 0 17.0 mi
Helix Water District
 277,918 0 18.1 mi
San Pasqual Academy
 298 0 18.1 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
City of San Diego EL Capitan Reservoir
 300 0 0
Alpine American Legion
 100 1 0
Descanso Fire Station
 34 0 0
All Saints Retreat and Formation Center
 72 2 1
Descanso Junction
 100 1 0
Cuyamaca SP Paso Picacho
 691 0 0
Thousand Trails Oakzanita Inc.
 404 0 0
Cuyamaca SP Green Valley
 455 0 0
Cuyamaca Outdoor School
 20 0 0
EL Monte County Park
 100 0 0
Camp Winacka
 250 0 0
William Heise County Park
 850 1 0
Oakoasis Open Space Preserve
 25 1 0
Whispering Winds Catholic Conference Cen
 164 0 0
Pinezanita Inc.
 400 0 0
The Oaks Venture, LLC
 220 0 0
Pinecrest
 70 0 0
KQ Ranch Resort
 400 0 0
Ramona Oaks RV Resort
 250 4 0
Jess Martin County Park
 150 1 0
Calvary Chapel Julian
 101 1 0
Apple Water IS Good
 25 1 0
Spencer Valley School District
 40 2 0
Sacred Mountain Inn
 30 1 0
Nickel Beer Water Company
San Diego 		100 0 0
Santa Ysabel Nature Center
San Diego 		248 0 0
Julian Oaks Camp
 72 0 0
Auerbach Farms
 68 0 0
Sutherland Reservoir Recreation Area
 300 1 0
Skyline Ranch RV Park & Campground
 45 0 0
Mount Laguna Water System
 3,500 0 0
Camp Cedar Glen
 65 1 0
Diamond Jack's RV Ranch
 115 1 1
Mount Laguna Improvement Assn.
 580 1 1
Sycamore Canyon / Goodan Ranch
 50 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Anza Borrego SP Vallecito
 31 0 0
Cibbetts Flats Campground
 25 0 0
Mountain Empire High School
 1,000 0 0
City of San Diego, Camp Morena
 200 0 0
Lake Morena County Park
 300 0 0
Stagecoach Trails RV Resort
 600 2 0
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
Bandy Canyon Ranch Corp
 3,564 0 0
Mataguay Scout Reservation
 4,000 1 0
San Pasqual Battlefield State Park
 44 0 0
San Diego Mountain Lodge
 26,641 3 0
Pine Valley Border Patrol Station
 54 0 0
Vallecito County Park
 145 1 0
East County Transitional Living Center
 50 1 0
All non-community systems
About this data

Water systems are matched to San Diego County, nearest to San Diego 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.

Town locations and ZIP code areas come from U.S. Census Bureau 2020 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.