Washington 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.
Washington 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 2.583 persons per household. The USGS estimates the population of self-supplied water supply users in Washington to be 1,020,000, with 100% of their water supply from groundwater.
- 2,088 community water systems use groundwater for 3,052,800 people
- 344 non-community, non-transient water systems use groundwater for 82,800 people
- 1,773 non-community, transient water systems use groundwater for 316,100 people
- 6,800 irrigation wells used serving 4,200 farms and 517,000 acres