Anaheim
Beverly Hills
Burbank
Compton
Fullerton
Glendale
Long Beach
Los Angeles
Pasadena
San Fernando
San Marino
Santa Ana
Santa Monica
Torrance
Calleguas Municipal Water District
- Camarillo
- Camarillo Heights
- Fairview
- Lake Sherwood Valley
- Las Posas
- Moorpark
- Oak Park
- Oxnard
- NAWS Point Mugu
- NCBC Port Hueneme
- Port Hueneme
- Simi Valley
- Santa Rosa Valley
- Somis
- Thousand Oaks
Central Basin Municipal Water District
- Artesia
- Bell
- Bellflower
- Bell Gardens
- Cerritos
- Commerce
- Cudahy
- Downey
- East Los Angeles
- Florence
- Hawaiian Gardens
- Huntington Park
- La Habra Heights
- Lakewood
- La Mirada
- Lynwood
- Maywood
- Montebello
- Norwalk
- Paramount
- Pico Rivera
- Santa Fe Springs
- Signal Hill
- South Gate
- South Whittier
- Vernon
- Whittier
Eastern Municipal Water District
- Nuevo
- Menifee
- Good Hope
- Hemet
- Homeland
- Juniper Flats
- Lakeview
- Mead Valley
- Moreno Valley
- Murrieta
- Murrieta Hot Springs
- North Canyon Lake
- Perris
- Quail Valley
- Romoland
- San Jacinto
- Sun City
- Temecula
- Valle Vista
- Winchester
Foothill Municipal Water District
- Altadena
- La Cañada Flintridge
- La Crescenta
- Montrose
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Inland Empire Utilities Agency
- Chino
- Chino Hills
- Fontana
- Montclair
- Ontario
- Rancho Cucamonga
- Upland
Las Virgenes Municipal Water District
- Agoura
- Agoura Hills
- Calabasas
- Chatsworth
- Lake Manor
- Hidden Hills
- Malibu Lake
- Monte Nido
- Westlake Village
- West Hills
Municipal Water District of Orange County
- Brea
- Buena Park
- Capistrano Beach
- Corona Del Mar
- Costa Mesa
- Coto De Caza
- Cypress
- Dana Point
- Fountain Valley
- Garden Grove
- Huntington Beach
- Irvine
- Laguna Beach
- Laguna Hills
- Laguna Niguel
- Laguna Woods
- La Habra
- Lake Forest
- La Palma
- Leisure World
- Los Alamitos
- Mission Viejo
- Monarch Beach
- Newport Beach
- Orange
- Placentia
- Rancho Santa Margarita
- San Clemente
- San Juan Capistrano
- Seal Beach
- Stanton
- Tustin
- Tustin Foothills
- Villa Park
- Westminster
- Yorba Linda
San Diego County Water Authority
- Alpine
- Bonita
- Bonsall
- Camp Pendleton
- Carlsbad
- Casa De Oro
- Chula Vista
- Del Mar
- El Cajon
- Encinitas
- Escondido
- Fallbrook
- Lakeside
- La Mesa
- Lemon Grove
- Mount Helix
- National City
- Oceanside
- Pauma Valley
- Poway
- Rainbow
- Ramona
- Rancho Santa Fe
- San Diego
- San Marcos
- Santee
- Solana Beach
- Spring Valley
- Valley Center
- Vista
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Three Valleys Municipal Water District
- Azusa
- Charter Oak
- Claremont
- Covina
- Covina Knolls
- Diamond Bar
- Glendora
- Industry
- La Verne
- Pomona
- Rowland Heights
- San Dimas
- South San Jose Hills
- Walnut
- West Covina
Upper San Gabriel Valley Municipal Water District
- Avocado Heights
- Arcadia
- Baldwin Park
- Bradbury
- Citrus
- Covina
- Duarte
- El Monte
- Glendora
- Hacienda Heights
- Industry
- Irwindale
- La Puente
- Mayflower Village
- Monrovia
- Rosemead
- San Gabriel
- South El Monte
- South Pasadena
- South San Gabriel
- Temple City
- Valinda
- West Covina
- West Puente Valley
West Basin Municipal Water District
- Alondra Park
- Carson
- Culver City
- El Segundo
- Gardena
- Hawthorne
- Hermosa Beach
- Inglewood
- Ladera Heights
- Lawndale
- Lennox
- Lomita
- Malibu
- Manhattan Beach
- Marina Del Rey
- Palos Verdes Estates
- Rancho Palos Verdes
- Redondo Beach
- Rolling Hills
- Rolling Hills Estates
- Ross-Sexton
- Topanga Canyon
- Torrance
- West Athens
- West Hollywood
Western Municipal Water District of Riverside County
- Bedford Heights
- Canyon Lakes
- Corona
- Eagle Valley
- El Sobrante
- Jurupa
- Lake Elsinore
- Lake Mathews
- March Air Reserve Base
- Murrieta
- Norco
- Riverside
- Rubidoux
- Temecula
- Temescal Canyon
- Woodcrest
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