| Alpine County |
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| Alta Irrigation District |
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| Anderson-Cottonwood Irrigation District |
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| Arlington Basin |
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| Arvin Edison Water Storage District |
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| Bear Valley Community Services District |
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| Biggs-West Gridley Irrigation District |
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| Borrego Water District |
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| Buena Vista Water Storage District |
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| Butte County Department of Water and Resource Conservation |
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| Butte Water District |
| Calaveras County Water District |
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| Carpinteria Valley Water District |
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| Castaic Lake Water Agency |
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| Cawelo Water District |
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| Chowchilla Water District-Red Top Resource Conservation District Joint Powers Authority |
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| City of Beverly Hills |
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| City of Corona |
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| City of East Palo Alto |
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| City of Lincoln |
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| City of Riverside |
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| City of Tracy |
| City of Vacaville |
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| City of Woodland |
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| Coachella Valley Water District |
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| Colusa County |
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| Consolidated Irrigation District |
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| Deer Creek and Tule River Authority |
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| Delano Earlimart Irrigation District |
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| Diablo Water District |
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| Dunnigan Water District |
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| East Bay Municipal Utility District |
| Eastern Municipal Water District West San Jacinto Groundwater Basin |
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| El Camino Irrigation District |
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| Elsinore Valley Municipal Water District |
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| Feather Water District |
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| Fox Canyon Groundwater Management Agency |
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| Fresno Area Regional |
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| Fresno Slough, Tranquility ID |
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| Glenn Colusa Irrigation District |
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| Glenn County |
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| Goleta Water District |
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| Gravelly Ford WD |
| Humboldt Bay Municipal Water District |
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| Indian Wells Valley Water District |
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| Inyo County and City of Los Angeles |
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| James Irrigation District |
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| Kaweah Delta Water Conservation District |
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| Kern Delta Water District |
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| Kern Tulare Water District - Rag Gulch Water District |
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| Kings County Water District |
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| Kings River Conservation District |
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| Kings River Water District |
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| Lake County Watershed Protection District |
| Lassen County |
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| Lompoc Water Service Area |
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| Madera Irrigation District |
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| Madera Regional |
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| Madera Water District |
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| Maine Prairie Water District |
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| Mammoth Community Water District |
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| Martis Valley |
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| Maxwell Irrigation District |
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| Mendocino City Community Services District |
| Merced Area Groundwater Pool Interests (MAGPI) |
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| Mojave Water Agency |
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| Montecito Water District |
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| Monterey County Water Resource Agency |
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| Natomas Central Mutual Water Company |
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| Newhall County Water District |
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| North Kern Water Storage District & Rosedale Ranch Improvement District |
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| North San Joaquin Water Conservation District |
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| Northeastern San Joaquin County Groundwater Banking Authority |
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| Ojai Basin Groundwater Management Agency |
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| Orange County Water District |
| Orange Cove Irrigation District |
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| Orland-Artois Water District |
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| Pajaro Valley Water Management Agency |
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| Paso Robles Groundwater Basin |
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| Princeton-Codora-Glenn, Provident Water District |
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| Rainbow Municipal Water District |
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| Reclamation District No. 108 |
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| Reclamation District No. 2035 |
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| Reclamation District No. 2068 |
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| Reclamation District No. 787 |
| Reclamation District No.1500 |
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| Redding Area Water Council |
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| Richvale Irrigation District |
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| Riverdale Irrigation District |
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| Root Creek Water District |
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| Rosedale Rio Bravo Water Service District |
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| Sacramento Central Groundwater Authority |
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| Sacramento Groundwater Authority |
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| San Diego Water Department, City of San Pasqual Basin |
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| San Joaquin River Exchange Contractors Water Authority |
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| San Juan Basin Authority, Metropolitan Water District of Southern California |
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| San Luis Delta Mendota Water Authority-North |
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| San Luis Delta Mendota Water Authority-South |
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| Santa Clara Valley Water District |
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| Santa Ynez River Water Conservation District |
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| Scotts Valley Water District |
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| Semitropic Water Storage District |
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| Shafter Wasco Irrigation District |
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| Siskiyou County - Scott Valley |
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| Solano Irrigation District |
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| Sonoma County Water Agency |
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| Sonoma County Water Agency - Santa Rosa Plain |
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| Soquel Creek Water District |
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| South Basin |
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| South San Joaquin Irrigation District |
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| South Sutter Water District |
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| South Tahoe Public Utility District |
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| South West Side Basin |
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| Southeast Sacramento County Agricultural Water Authority |
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| Squaw Valley Public Service District |
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| Stakeholders of the Hemet, San Jacinto Water Management Area |
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| Stanislaus and Tuolumne Rivers Groundwater Basin Association |
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| Sutter County Public Works Department |
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| Sutter Extension Water District |
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| Tehama County Flood Control and Water Conservation District |
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| Tulare Irrgation District |
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| Tulare Lake Bed Coordinated |
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| Tulelake Irrigation District |
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| Turlock Groundwater Basin Association |
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| Twenty-nine Palms Water District |
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| United Water Conservation District |
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| Ventura County Waterworks District No. 8, City of Simi Valley |
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| Water Replenishment District |
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| Water Resources Association of San Benito County |
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| West Kern Water District |
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| Western Canal Water District |
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| Western Placer County Group |
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| Westlands Water District |
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| Westside Water District |
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| Wheeler Ridge Maricopa Water Storage District |
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| Yolo County Flood Control and Water Conservation District |
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| Yuba County Water Agency |
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| Zone 7 Water Agency |