Tapcensus

All water systems in California

7,380 systems

SystemServesStatusRules violated, 3 yrUnresolved
Winterhaven County Water District
Imperial County 		394 2 1
San Andreas Mutual Water CO
Santa Cruz County 		392 0 0
Stanislaus Union School Dist
Stanislaus County 		390 1 1
Coarsegold School
Madera County 		389 0 0
Lodi Usd-Davis School
San Joaquin County 		389 1 0
Spring Creek Tract Association
El Dorado County 		389 2 0
Great Western Elementary School
Fresno County 		388 0 0
Lakeside Elementary School
Kings County 		388 0 0
Del Oro Water Company Strawberry Div.
Tuolumne County 		386 1 0
Valley Estates Poa, Inc.
Kern County 		386 0 0
Camp Roberts California National Guard
Monterey County 		385 0 0
Chatom School (eh)
Stanislaus County 		385 1 1
Forest Springs
Santa Cruz County 		385 0 0
Monrovia Nursery
Tulare County 		385 2 2
Joseph Gallo Cheese Co.
Merced County 		384 0 0
South Kaweah Mutual Water Company
Tulare County 		384 3 1
Occidental Community Services District
Sonoma County 		383 0 0
Colusa Co. Wwd #2 Princeton
Colusa County 		382 0 0
Thomas Aquinas College
Ventura County 		382 1 0
Ardagh Glass, INC
Madera County 		381 0 0
Strawberry Lodge Mwc
San Bernardino County 		381 1 1
Bellevue Union Sch Dist-Bellevue School
Sonoma County 		380 0 0
Berkeley Tuolumne Camp
Tuolumne County 		380 1 0
Pine Hills Mutual Water Company
San Diego County 		380 2 0
Western Acres Mutual Water Company
Kern County 		380 0 0
Willow Park Marina
Contra Costa County 		380 1 0
Torres-Martinez Clinic
County 		379 2 1
Younglife Woodleaf
Yuba County 		378 0 0
Laguna Vista School/oceanview School Dis
Ventura County 		377 0 0
Bates Elementary School
Sacramento County 		375 1 1
Berryessa Brewing Company
Winters · Yolo County 		375 0 0
Las Deltas Mutual Water Company
Fresno County 		375 2 1
Lodi Usd-Live Oak School
San Joaquin County 		375 0 0
MD 73 Quartz Mountain
Madera County 		375 1 0
Nichols Farms
Kings County 		375 0 0
Prairie Elementary School
Shasta County 		375 0 0
Sereno del Mar Water Company (puc)
Sonoma County 		375 0 0
Usda-Forest Service Hume Lake Campground
Fresno County 		375 0 0
Usfs Hungry & Boulder Gulch Campground
Kern County 		375 0 0
Bridgeport Pud
Mono County 		374 3 1
Anderson Springs Csd
Lake County 		373 0 0
True Leaf Farms, Llc.
San Benito County 		372 1 0
Csp-Westport State Beach
Mendocino County 		370 0 0
Oak Creek Mobile Home Park
Madera County 		370 0 0
Smiley Park Country Club
San Bernardino County 		370 1 0
Lick Observatory-Ucsc
Santa Clara County 		369 0 0
Burlington Cg-State Parks
Humboldt County 		368 0 0
Saviers Road Mutual Water CO
Ventura County 		368 0 0
Black Rascal Water Company
Merced County 		367 1 1
Wildhorse Cafe WS
Monterey County 		367 1 1
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.