| Ground Water Management District | Formed | Location |
| Desert Water Agency | -- | San Bernardino County |
| Fox Canyon Ground Water Management Agency | 1982 | Ventura County |
| Honey Lake Valley Ground Water Management District | 1989 | Lassen County |
| Long Valley Ground Water Management District | 1980 | Lassen and Sierra Counties |
| Mendocino City Community Services District | 1971 | Mendocino County |
| Mono County Tri-Valley Ground Water Management District | 1989 | Mono County |
| Monterey Peninsula Water Management District | 1947 | Monterey County |
| Ojai Ground Water Management Agency | 1991 | Ventura County |
| Orange County Water District | 1933 | Orange County |
| Pajaro Valley Water Management Agency | 1984 | Santa Cruz County |
| Santa Clara Valley Water District | -- | Ventura County |
| Sierra Valley Ground Water Management District | 1980 | Sierra County |
| Willow Creek Ground Water Management Agency | 1993 | Lassen County |