Tapcensus

All water systems in California

7,380 systems

SystemServesStatusRules violated, 3 yrUnresolved
Covina Valley Water Company Wholesale
Los Angeles County 		0 0 0
East Orange County WD WZ
Orange County 		0 0 0
Foothill Municipal Water Dist.
Los Angeles County 		0 2 0
Joint Regional Water Supply System
Orange County 		0 0 0
Kern County Water Agency
Kern County 		0 0 0
Ladwp Big Pine
Inyo County 		0 0 0
Ladwp Independence
Inyo County 		0 0 0
Ladwp Laws Town
Inyo County 		0 0 0
Ladwp Lone Pine
Inyo County 		0 0 0
Ladwp Manzanar
Bishop · Inyo County 		0 0 0
Metropolitan Water Dist. of So. Cal.
Los Angeles County 		0 0 0
Modesto Irrigation District
Stanislaus County 		0 0 0
Mojave Water Agency
San Bernardino County 		0 0 0
Nacimiento Water Project
San Luis Obispo County 		0 0 0
Port Hueneme Water Agency
Ventura County 		0 0 0
San Benito County Water District
San Benito County 		0 0 0
San Diego County Water Authority
San Diego County 		0 0 0
Santa Clara Valley Water District
Santa Clara County 		0 0 0
Slo Csa No. 10 Cayucos Wtp
San Luis Obispo County 		0 0 0
Smwd SJ Ground Water Plant
Orange County 		0 0 0
Sonoma County Water Agency
Sonoma County 		0 0 0
South San Joaquin Irrigation District
Stanislaus County 		0 0 0
Stanislaus Regional Water Authority
Stanislaus County 		0 0 0
Stockton East Water District
San Joaquin County 		0 0 0
Three Valleys Mwd
Los Angeles County 		0 0 0
United Wtr Cons Dist
Ventura County 		0 0 0
Water Facilities Authority-Jpa
San Bernardino County 		0 0 0
West End Consolidated Water Company
San Bernardino County 		0 0 0
Western Mwd (arlington)
Riverside County 		0 0 0
Woodland-Davis Clean Water Agency
Woodland · Yolo 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 still 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. Retrieved from ECHO on Oct 11, 2026.