Tapcensus

Water quality for ZIP code 91935

ZIP 91935 covers Jamul 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

Otay Water District CA3710034 · Community water system · Surface water purchased
Serves 242,155 people Rules violated, past 3 years 0 Last sanitary survey Feb 9, 2026 Distance 8.7 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
MHC TT Inc. (dba Pio Pico)
 23 0 6.3 mi
Sunrise Estates Mutual Water Company
 150 2 6.6 mi
Alpine Oaks Estates LLC
 185 0 8.1 mi
Willowside Terrace Water Association
 100 2 8.8 mi
Barrett Lake MH and RV LLC
 300 1 8.9 mi
Padre Dam Mwd
 93,980 0 9.3 mi
Helix Water District
 277,918 0 11.4 mi
Twin Lakes Resort
 400 5 12.3 mi
Lakeside WD
 35,500 1 13.4 mi
Descanso Community Water District
 870 3 13.8 mi
Heavenly Oaks
 300 1 15.6 mi
Pine Valley Trailer Park
 200 0 16.0 mi
San Diego County Water Authority
 0 0 16.1 mi
Lake Morena's Oak Shores Mwc
 670 2 16.2 mi
Guatay Mutual Benefit Corporation
 100 4 16.4 mi
Pine Valley Mutual WC
 2,574 1 16.8 mi
Lake Morena Views Mwc
 360 1 16.8 mi
Sweetwater Authority
 184,915 0 16.9 mi
Pine Valley Bible Conference Center
 50 0 17.1 mi
Rancho del Campo Water System
 290 0 20.1 mi
Campo Hills-County Public Works Wastewtr
 500 0 20.2 mi
Cal-Am Water Coronado
 106,000 1 20.8 mi
LA Cima Fire Center
 60 0 20.9 mi
Ramona Municipal WD
 36,455 0 21.5 mi
San Diego, City of
San Diego		 1,408,937 0 21.9 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
Skyline Ranch RV Park & Campground
 45 0 0
Diamond Jack's RV Ranch
 115 1 1
Dhs Border Patrol Hwy 94 Checkpoint
 83 2 1
East County Transitional Living Center
 50 1 0
South Bay Rod & Gun Club Inc.
 18,900 1 0
Alpine American Legion
 100 1 0
ND Daniel's Investment LLC
 106 0 0
City of San Diego EL Capitan Reservoir
 300 0 0
EL Monte County Park
 100 0 0
Potrero Elementary School
 300 0 0
Descanso Junction
 100 1 0
Descanso Fire Station
 34 0 0
Potrero General Store
 75 0 0
All Saints Retreat and Formation Center
 72 2 1
Potrero County Park
 100 1 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
Oakoasis Open Space Preserve
 25 1 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 High School
 1,000 0 0
Caltrans, Buckman Springs Rest Area
 25 1 0
Mountain Empire R.v. Park and Campground
 23 0 0
Sycamore Canyon / Goodan Ranch
 50 0 0
Freedom Ranch
 235 0 0
Cuyamaca SP Green Valley
 455 0 0
Campo Elementary School
 300 3 0
San Ysidro Health Mhfm
 30 1 0
Camp Lockett Middle School
 34 1 1
Cuyamaca Outdoor School
 20 0 0
Cameron Corners
 50 0 0
Campo Group LLC
 50 0 0
Pine Valley Border Patrol Station
 54 0 0
Cibbetts Flats Campground
 25 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Usn Camp Michael Monsoor
San Diego 		159 0 0
Mount Laguna Water System
 3,500 0 0
Mount Laguna Improvement Assn.
 580 1 1
Camp Winacka
 250 0 0
Ramona Oaks RV Resort
 250 4 0
William Heise County Park
 850 1 0
Whispering Winds Catholic Conference Cen
 164 0 0
The Oaks Venture, LLC
 220 0 0
Pinezanita Inc.
 400 0 0
KQ Ranch Resort
 400 0 0
Pinecrest
 70 0 0
Boulevard KOA Drinking Water
 50 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.