Tapcensus

Water quality for ZIP code 91963

ZIP 91963 covers Potrero 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

Twin Lakes Resort CA3701793 · Community water system · Ground water
Serves 400 people Rules violated, past 3 years 5 Unresolved 2 Last sanitary survey Jan 28, 2026 Distance 0.1 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
Barrett Lake MH and RV LLC
 300 1 4.7 mi
Sunrise Estates Mutual Water Company
 150 2 5.9 mi
Lake Morena's Oak Shores Mwc
 670 2 6.8 mi
Lake Morena Views Mwc
 360 1 7.3 mi
Campo Hills-County Public Works Wastewtr
 500 0 8.4 mi
Rancho del Campo Water System
 290 0 8.4 mi
Guatay Mutual Benefit Corporation
 100 4 14.4 mi
MHC TT Inc. (dba Pio Pico)
 23 0 14.4 mi
Pine Valley Mutual WC
 2,574 1 14.8 mi
Pine Valley Trailer Park
 200 0 15.6 mi
Pine Valley Bible Conference Center
 50 0 15.6 mi
Heavenly Oaks
 300 1 15.8 mi
Willowside Terrace Water Association
 100 2 15.9 mi
Alpine Oaks Estates LLC
 185 0 16.1 mi
Descanso Community Water District
 870 3 16.1 mi
Live Oak Springs Water System
 317 1 16.6 mi
Otay Water District
 242,155 0 18.5 mi
Laguna Mountain Mutual Water Co.
 100 0 20.0 mi
Padre Dam Mwd
 93,980 0 21.0 mi
LA Cima Fire Center
 60 0 22.0 mi
Helix Water District
 277,918 0 23.6 mi
Jacumba Community SD
 561 1 24.5 mi
Lakeside WD
 35,500 1 25.3 mi
Cuyamaca Water District
 160 0 25.3 mi
Butterfield Ranch
 350 2 26.3 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
Potrero Elementary School
 300 0 0
Potrero County Park
 100 1 0
Potrero General Store
 75 0 0
Muir Industries Inc.
 70 0 0
Gsa Tecate Port of Entry
 70 1 0
Tecate Vista Mutual Water Company
 204 1 1
Tecate Supermarket
 25 0 0
ND Daniel's Investment LLC
 106 0 0
Mountain Empire R.v. Park and Campground
 23 0 0
Lake Morena County Park
 300 0 0
Campo Elementary School
 300 3 0
Freedom Ranch
 235 0 0
East County Transitional Living Center
 50 1 0
Camp Lockett Middle School
 34 1 1
City of San Diego, Camp Morena
 200 0 0
San Ysidro Health Mhfm
 30 1 0
Cameron Corners
 50 0 0
Campo Group LLC
 50 0 0
South Bay Rod & Gun Club Inc.
 18,900 1 0
Mountain Empire High School
 1,000 0 0
Usn Camp Michael Monsoor
San Diego 		159 0 0
Pine Valley Border Patrol Station
 54 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Skyline Ranch RV Park & Campground
 45 0 0
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
Diamond Jack's RV Ranch
 115 1 1
Cibbetts Flats Campground
 25 0 0
Descanso Junction
 100 1 0
All Saints Retreat and Formation Center
 72 2 1
Boulevard KOA Drinking Water
 50 0 0
Descanso Fire Station
 34 0 0
Alpine American Legion
 100 1 0
Thousand Trails Oakzanita Inc.
 404 0 0
Boulevard Pines Mobile Home and RV Park
 21 1 0
Clover Flat Elementary School
 160 0 0
Back Country Inn
 47 1 0
Mount Laguna Water System
 3,500 0 0
Dhs Boulevard Border Patrol
 155 0 0
Calexico Lodge
 49 0 0
Cuyamaca SP Green Valley
 455 0 0
Mount Laguna Improvement Assn.
 580 1 1
Rough Acres Foundation
 495 1 0
City of San Diego EL Capitan Reservoir
 300 0 0
Cuyamaca Outdoor School
 20 0 0
EL Monte County Park
 100 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Jacumba Valley Ranch Water Company
 4,520 1 0
DE Anza Springs Resort
 1,000 0 0
Oakoasis Open Space Preserve
 25 1 0
Anza Borrego SP Vallecito
 31 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.