Tapcensus

Water quality for ZIP code 91950

ZIP 91950 covers National City, Chula Vista, 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

Sweetwater Authority CA3710025 · Community water system · Surface water
Serves 184,915 people Rules violated, past 3 years 0 Last sanitary survey Nov 22, 2023 Distance 2.2 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
Cal-Am Water Coronado
 106,000 1 4.7 mi
Nas North Island & Nab Coronado
 421 0 6.8 mi
Otay Water District
 242,155 0 9.9 mi
Helix Water District
 277,918 0 10.6 mi
San Diego County Water Authority
 0 0 10.9 mi
San Diego, City of
San Diego		 1,408,937 0 11.5 mi
MHC TT Inc. (dba Pio Pico)
 23 0 13.9 mi
Lakeside WD
 35,500 1 17.5 mi
Padre Dam Mwd
 93,980 0 17.5 mi
Poway, City of
Poway		 49,888 0 22.0 mi
Del Mar, City of
Del Mar		 3,950 0 22.5 mi
Sunrise Estates Mutual Water Company
 150 2 22.8 mi
Alpine Oaks Estates LLC
 185 0 23.5 mi
Barrett Lake MH and RV LLC
 300 1 23.7 mi
Willowside Terrace Water Association
 100 2 24.5 mi
Santa FE I.d.
 21,539 0 24.7 mi
Olivenhain Mwd
 86,458 0 26.5 mi
Ramona Municipal WD
 36,455 0 27.0 mi
Del Dios Mutual Water Company
 330 3 27.8 mi
Rincon del Diablo Mwd (id-A)
 5,016 0 28.2 mi
San Dieguito WD
 40,405 1 28.4 mi
Twin Lakes Resort
 400 5 28.4 mi
San Pasqual Academy
 298 0 29.8 mi
Rincon del Diablo Mwd (id-1)
 28,427 0 30.4 mi
Descanso Community Water District
 870 3 30.8 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
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
Diamond Jack's RV Ranch
 115 1 1
Sycamore Canyon / Goodan Ranch
 50 0 0
Skyline Ranch RV Park & Campground
 45 0 0
South Bay Rod & Gun Club Inc.
 18,900 1 0
Oakoasis Open Space Preserve
 25 1 0
East County Transitional Living Center
 50 1 0
EL Monte County Park
 100 0 0
City of San Diego EL Capitan Reservoir
 300 0 0
ND Daniel's Investment LLC
 106 0 0
Alpine American Legion
 100 1 0
Hodges Reservoir Recreation Area
 200 0 0
Tecate Vista Mutual Water Company
 204 1 1
Muir Industries Inc.
 70 0 0
Tecate Supermarket
 25 0 0
Gsa Tecate Port of Entry
 70 1 0
Potrero Elementary School
 300 0 0
Bandy Canyon Ranch Corp
 3,564 0 0
Potrero General Store
 75 0 0
Questhaven Municipal Water District
 81 2 0
San Pasqual Battlefield State Park
 44 0 0
Potrero County Park
 100 1 0
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
Lake Morena County Park
 300 0 0
City of San Diego, Camp Morena
 200 0 0
Thousand Trails Oakzanita Inc.
 404 0 0
Mountain Empire R.v. Park and Campground
 23 0 0
Sutherland Reservoir Recreation Area
 300 1 0
Cuyamaca SP Green Valley
 455 0 0
Mountain Empire High School
 1,000 0 0
Daley Ranch
 200 0 0
Campo Elementary School
 300 3 0
The Oaks Venture, LLC
 220 0 0
Freedom Ranch
 235 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Cuyamaca Outdoor School
 20 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Camp Lockett Middle School
 34 1 1
San Ysidro Health Mhfm
 30 1 0
Cameron Corners
 50 0 0
Campo Group LLC
 50 0 0
Camp Winacka
 250 0 0
Pine Valley Border Patrol Station
 54 0 0
Cibbetts Flats Campground
 25 0 0
William Heise County Park
 850 1 0
Usn Camp Michael Monsoor
San Diego 		159 0 0
Auerbach Farms
 68 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.