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Maps of Santa Ana Region
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The cities and municipalities that fall within the jurisdiction of the Santa Ana Regional Water Quality Control Board are listed by county below.
Cities within Orange County
Anaheim
Foothill Ranch
Newport Beach
Anaheim Hills
Fullerton
Orange
Balboa/Balboa Island
Garden Grove
Placentia
Brea
Huntington Beach
Santa Ana
Buena Park
Irvine
Seal Beach
Corona Del Mar
La Habra
Stanton
Costa Mesa
La Palma
Sunset Beach
Cypress
Laguna Hills
Tustin
El Sobrante
Lake Forest
Villa Park
El Toro
Los Alamitos
Westminister
Fountain Valley
Midway City
Yorba Linda
Cities within Riverside County
Beaumont
Idyllwild
Pedley
Calimesa
Lake Elsinore
Perris
Corona
Lakeview
Riverside
Edgemont
Menifee
Romoland
Glen Avon
Mira Loma
Rubidoux
Glen Ivy
Moreno Valley
San Jacinto
Hemet
Norco
Sun City
Cities within San Bernardino County
Barton Flats
Fawnskin
Ontario
Big Bear City
Fontana
Rancho Cucamonga
Big Bear Lake
Forest Falls
Redlands
Bloomington
Glen Helen
Rialto
Chino
Highland
Rim Forest
Chino Hills
Loma Linda
Running Springs
Colton
Lytle Creek
San Bernardino
Crafton Hills
Mentone
Upland
Crestline
Mill Creek
Yucaipa
Devore
Montclair
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