California Groundwater and Water Well Statistics
Few states can accurately or confidentially determine how many residential wells are in place. For each region, the American Housing Survey by the U.S. Census provides regional data.
California is found in the West, along with these other states: Alaska, Hawaii, Washington, Oregon, California, Idaho, Utah, Nevada, Arizona, New Mexico, Colorado, Wyoming, and Montana.
The last American Housing Survey Census indicates this region had 1,540,0002 households served by residential wells, with an average of 2.973 persons per household. The USGS estimates the population of self-supplied water supply users in California to be 1,440,000 for which groundwater is 85% of their water source.
- 2,081 community water systems use groundwater for 7,286,000 people
- 1,393 non-community, non-transient water systems use groundwater for 371,400 people
- 2,874 non-community, transient water systems use groundwater for 603,200 people
- 59,500 irrigation wells used serving 23,600 farms and 3,860,000 acres