Tapcensus

All water systems in California

7,380 systems

SystemServesStatusRules violated, 3 yrUnresolved
Csp Rancho del Oso
Santa Cruz County 		822 0 0
Rio School Dist/rio del Valle School
Ventura County 		820 0 0
Liberty Elementary School
Tulare County 		818 0 0
Western Valley Meat Company
Fresno County 		815 0 0
Limoneira Ranch #1
Ventura County 		813 0 0
1000 Trails / Soledad Canyon Preserve
Los Angeles County 		812 1 0
Central Valley Meat CO INC
Kings County 		812 0 0
Usfs-Jackson Lake V-4
Los Angeles County 		805 0 0
Immanuel Sports Complex
Fresno County 		804 1 0
Resort Improvement District #1
Humboldt County 		803 0 0
Csp-J.p. Burns Park
Monterey County 		802 0 0
Chico Grange #486
Butte County 		800 0 0
Church of Jesus Christ of Lds (sws)
Sacramento County 		800 1 0
Delaware North Parks Services at Tenaya
Mariposa County 		800 0 0
John Latoracca Correctional Facility
Merced County 		800 1 1
Plumas-Eureka S.p.
Plumas County 		800 0 0
Senior Canyon Mutual Water CO
Ventura County 		800 1 0
South Yuba River State Park
Nevada County 		800 0 0
Big Pine Csd
Inyo County 		798 1 1
Manila Community Services Dist.
Humboldt County 		798 0 0
Ponderosa Basin Mutual Wtr CO
Mariposa County 		798 1 1
West Valley County Water District
Los Angeles County 		798 0 0
Daggett Comm Svcs Dist
San Bernardino County 		795 3 1
Ivcsd-Greenville
Plumas County 		795 0 0
Frito-Lay, Inc. Water System
Kern County 		793 0 0
Los Angeles Cwwd 40, Reg. 35-N.e. L.a.
Los Angeles County 		792 0 0
Shady Cove
San Bernardino County 		789 0 0
Sonora Water Resources, INC
Tuolumne County 		785 0 0
Yosemite Nps-Arch Rock
Mariposa County 		778 0 0
Mountain Mesa WC
Kern County 		777 0 0
Riverside Csa #122-Mesa Verde
Riverside County 		766 0 0
Meadowcreek Mutual Water Company
Inyo County 		764 1 1
Jubilee Mwc
San Bernardino County 		759 0 0
Central High School West
Fresno County 		758 0 0
Pacific Union College
Napa County 		758 0 0
Hurkey Creek Riv. Co. Parks
Riverside County 		756 1 0
Folsom Lake Sra Peninsula Campground
El Dorado County 		751 0 0
Bsa-Camp Whitsett
Tulare County 		750 0 0
California Rehabilitation Center Norco
Riverside County 		750 0 0
Foothill Elementary School
Fresno County 		750 2 1
Harris Ranch Restaurant
Fresno County 		750 0 0
Los Parientes
Butte County 		750 0 0
Madera Community College
Madera County 		750 0 0
Pioneer Elementary School
Kings County 		750 0 0
Richardson Grove Campground & RV Park
Humboldt County 		750 0 0
Riverdale Village
Kern County 		750 2 2
Shasta Forest Village M.w.c.
Shasta County 		750 1 0
Sun Maid Growers of California
Fresno County 		750 2 2
Tahoe Park Water Company
Placer County 		750 2 1
Usfs/deer Creek Campground
Fresno County 		750 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.