Tapcensus

Water quality for ZIP code 91931

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

Pine Valley Trailer Park CA3701961 · Community water system · Ground water
Serves 200 people Rules violated, past 3 years 0 Last sanitary survey Dec 11, 2025 Distance 0.1 mi
View system details EPA facility report

Other community water systems in San Diego County

81 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Heavenly Oaks
 300 1 0.7 mi
Pine Valley Bible Conference Center
 50 0 1.6 mi
Pine Valley Mutual WC
 2,574 1 2.1 mi
Guatay Mutual Benefit Corporation
 100 4 2.1 mi
Descanso Community Water District
 870 3 3.4 mi
LA Cima Fire Center
 60 0 6.5 mi
Laguna Mountain Mutual Water Co.
 100 0 8.1 mi
Willowside Terrace Water Association
 100 2 9.6 mi
Cuyamaca Water District
 160 0 10.2 mi
Alpine Oaks Estates LLC
 185 0 10.6 mi
Butterfield Ranch
 350 2 11.5 mi
Lake Morena's Oak Shores Mwc
 670 2 11.7 mi
Lake Morena Views Mwc
 360 1 11.9 mi
North Peak Mutual Water Company
 294 0 12.0 mi
H & J Water Company
 86 1 13.7 mi
Pine Hills Mutual Water Company
 380 2 14.4 mi
Richardson Beardsley Park Inc.
 30 1 14.6 mi
Sunrise Estates Mutual Water Company
 150 2 15.5 mi
Twin Lakes Resort
 400 5 15.6 mi
Majestic Pines Community SD
 1,768 1 15.7 mi
Julian Community Services District
 617 3 16.2 mi
Camp Stevens
 28 1 16.8 mi
Live Oak Springs Water System
 317 1 16.8 mi
Rancho del Campo Water System
 290 0 16.9 mi
Campo Hills-County Public Works Wastewtr
 500 0 17.0 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
Thousand Trails Oakzanita Inc.
 404 0 0
All Saints Retreat and Formation Center
 72 2 1
Descanso Junction
 100 1 0
Descanso Fire Station
 34 0 0
Cuyamaca SP Green Valley
 455 0 0
Cuyamaca Outdoor School
 20 0 0
Mount Laguna Water System
 3,500 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Mount Laguna Improvement Assn.
 580 1 1
Cibbetts Flats Campground
 25 0 0
Cuyamaca SP Paso Picacho
 691 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
Alpine American Legion
 100 1 0
Pine Valley Border Patrol Station
 54 0 0
Anza Borrego SP Vallecito
 31 0 0
Whispering Winds Catholic Conference Cen
 164 0 0
Pinezanita Inc.
 400 0 0
KQ Ranch Resort
 400 0 0
William Heise County Park
 850 1 0
Pinecrest
 70 0 0
City of San Diego EL Capitan Reservoir
 300 0 0
Camp Winacka
 250 0 0
Freedom Ranch
 235 0 0
Usn Camp Michael Monsoor
San Diego 		159 0 0
Campo Elementary School
 300 3 0
Vallecito County Park
 145 1 0
Skyline Ranch RV Park & Campground
 45 0 0
Jess Martin County Park
 150 1 0
San Ysidro Health Mhfm
 30 1 0
Cameron Corners
 50 0 0
Campo Group LLC
 50 0 0
Nickel Beer Water Company
San Diego 		100 0 0
Camp Lockett Middle School
 34 1 1
Potrero County Park
 100 1 0
Agua Caliente County Park
 400 0 0
Stagecoach Trails RV Resort
 600 2 0
Potrero Elementary School
 300 0 0
Julian Oaks Camp
 72 0 0
Sacred Mountain Inn
 30 1 0
Diamond Jack's RV Ranch
 115 1 1
Potrero General Store
 75 0 0
EL Monte County Park
 100 0 0
Calvary Chapel Julian
 101 1 0
Mountain Empire R.v. Park and Campground
 23 0 0
Apple Water IS Good
 25 1 0
Spencer Valley School District
 40 2 0
ND Daniel's Investment LLC
 106 0 0
Camp Cedar Glen
 65 1 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.