The thirty-five member districts are divided into four regions based on their physical location within California. The four regions are Coastal, Sacramento Valley, San Joaquin Valley, and Southern California. Below is a list of the member districts categorized by region.
| Coastal Region |
San Joaquin Valley Region |
| Alameda County MAD |
Coalinga-Huron MAD |
| Contra Costa MVCD |
Consolidated MAD |
| Marin-Sonoma MVCD |
Delta VCD |
| Napa County MAD |
Fresno MVCD |
| No. Salinas Valley MAD |
Kings MAD |
| San Mateo County MVCD |
San Joaquin County MVCD |
| Turlock MAD |
|
| Sacramento Valley Region |
Southern California Region |
| Burney Basin MAD |
Coachella Valley MVCD |
| Butte County MVCD |
Compton Creek MAD |
| Colusa MAD |
Greater Los Angeles County VCD |
| Durham MAD |
Los Angeles County West VCD |
| Glenn County MVCD |
Northwest MVCD |
| Lake County VCD |
Orange County VCD |
| Oroville MAD |
San Gabriel Valley MVCD |
| Pine Grove MAD |
MVMD of Santa Barbara County |
| Placer MVCD |
Shasta MVCD |
| Sacramento-Yolo MVCD |
Tehama County MVCD |
| Sutter-Yuba MVCD |
West Valley MVCD |