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City of Foster City/Estero Municipal Improvement District

Coachella Valley Water District

Yucaipa Valley Water District

Trabuco Canyon Water District

Ventura Water

Vallecitos Water District

Valley Center Municipal Water District

Valley of the Moon Water District

Ventura County Waterworks District #8

City of Folsom

City of Fresno

City of Glendale Water & Power

City of Chino Hills

City of Corona

City of Davis

City of Delano

City of Escondido

City of Brentwood

City of Camarillo

City of Chino

Citrus Heights Water District

City of Benicia

City of Beverly Hills

City of Big Bear Lake

Carlsbad Municipal Utility District

Carpinteria Valley Water District

California Water Service

Cambria Community Services District

Tahoe City Public Utility District

Town of Windsor

South Coast Water District

South Tahoe Public Utility District

Suburban Water Systems

Sweetwater Authority

San Gabriel Valley Water Co.

San Jose Water Company

Santa Margarita Water District

Rubidoux Community Services District

Sacramento Suburban Water District

San Dieguito Water District (City of Encinitas)

Otay Water District

Padre Dam Municipal Water District

Rancho California Water District

Riverside Public Utilities

North Coast County Water District

North Marin Water District

Ontario Municipal Utilities Company

Moulton Niguel Water District

Nipomo Community Services District

Marin Municipal Water District

Marina Coast Water District

Mesa Water District

Mid-Peninsula Water District

Las Virgenes Municipal Water District

Liberty Utilities

Long Beach Water

Los Angeles County Waterworks Division

Los Angeles Department of Water & Power

Irvine Ranch Water District

Jurupa Community Services District

Lake Arrowhead Community Services District

Great Oaks Water Company

Helix Water District

Indian Wells Valley Water District

Golden State Water Company

Goleta Water District

El Dorado Irrigation District

El Toro Water District

Fallbrook Public Utility District

Dublin San Ramon Services District

East Bay Municipal Utility District

East Orange County Water District

City of Woodland

Coastside County Water District

Cucamonga Valley Water District

City of Santa Rosa

City of Sonoma

City of Torrance

City of Upland

City of Vacaville

City of Santa Ana

City of Santa Barbara

City of Santa Cruz

City of Santa Monica

City of Napa

City of Newport Beach

City of San Luis Obispo

City of San Clemente

City of Glendora, Water Division

City of Huntington Beach

City of La Verne

City of Manteca

City of Mountain View

City of Paso Robles

City of Petaluma

City of Pomona

City of Redwood City

City of Roseville

City of Oceanside

City of Oxnard