Tapcensus

All water systems in California

7,380 systems

SystemServesStatusRules violated, 3 yrUnresolved
County of Monterey-Lake Nacimiento
San Luis Obispo County 		20 0 0
Cuyamaca Outdoor School
San Diego County 		20 0 0
Harris Farms/horse Barn
Fresno County 		20 0 0
Mid Bagby Recreation Area
Mariposa County 		20 0 0
Palomar Observatory
San Diego County 		20 0 0
Paradise Shores RV Park
Mono County 		20 0 0
Plantation Mobile Home Park
Sacramento County 		20 2 2
R Ranch at the Lake
Napa County 		20 2 1
Robinson's Corner MHP
Butte County 		20 8 2
Segura's RV Park LLC
Glenn County 		20 0 0
Usfs-Troy Meadow Campground
Tulare County 		18 0 0
Westminster Woods Camp
Sonoma County 		18 1 1
Thousand Trails San Benito Preserve
San Benito County 		17 1 0
Alpine Village Water Company
Tulare County 		16 0 0
Mountain Streams RV Park
San Bernardino County 		16 1 0
Coco Palms Mobile Home Park
Imperial County 		15 0 0
Desiderata Estates Mutual Water Company
Inyo County 		15 0 0
Jago Bay Mutual Water Company
Lake County 		15 0 0
Mwd Eagle Mountain
Riverside County 		15 0 0
Mammoth Yosemite Airport
Mono County 		13 0 0
Musick Meadows 1
Fresno County 		13 2 1
Thousand Trails Morgan Hill
Santa Clara County 		13 1 0
Fourth Street Water System
Kern County 		12 0 0
Rey River Ranch Corp.
San Diego County 		12 0 0
Barton Flats Water System
San Bernardino County 		11 1 1
L. C. Hunting Club
Butte County 		10 0 0
Los Angeles, City of Power Plant #1
Saugus · Los Angeles County 		10 0 0
Rinconada Trailer Park
San Luis Obispo County 		10 0 0
Sierra Masonic Water CO
Tulare County 		10 0 0
Willow Springs Resort
Mono County 		9 0 0
North Shore Mwc
San Bernardino County 		7 0 0
Biggers Glen Mutual Water CO
Butte County 		6 1 1
Bolo Station RV Park & Snack Bar
San Bernardino County 		6 2 0
Indian Oaks Trailer Park
Riverside County 		5 0 0
Bernasconi Education Center
Inyo County 		3 0 0
Travis Afb Wtp Vallejo
Solano County 		3 0 0
Camp Heart Bar Equestrian Group
San Bernardino County 		1 0 0
Randall-Bold Water Treatment Plant
Contra Costa County 		1 0 0
Sfpuc-Pleasanton Wells
Alameda County 		1 0 0
Thomas Shaft Wholesale
San Joaquin County 		1 0 0
Antelope Valley East Kern Water Agency
Los Angeles County 		0 0 0
Cachuma Project
Santa Barbara County 		0 0 0
California Domestic Water Company
Los Angeles County 		0 0 0
Calleguas Municipal Water Dist
Ventura County 		0 0 0
Carlsbad Desalination Plant
San Diego County 		0 0 0
Ccwd/brentwood Wtp
Contra Costa County 		0 0 0
Central Coast Water Authority
Santa Barbara County 		0 0 0
Chino Basin Desalter Auth. Desalter 1
San Bernardino County 		0 0 0
Chino Basin Desalter Auth. Desalter 2
Riverside County 		0 0 0
Chorro Valley Pipeline Slo County
San Luis Obispo County 		0 0 0
About this data

Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.

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.