# Washington Well Data

> County-level water well statistics for Washington — median drilled depth, static water level, and tested yield — computed from 342,388 official well records in Washington State Department of Ecology well construction reports's database, the state's official repository of well logs. Refreshed weekly; statistics last computed 2026-06-11.

Every county page includes: median/quartile well depths, static water levels, pump-test yields, a drilled-depth histogram, drilling cost estimates (local median depth × cited per-foot rates), and the drillers active in that county since 2016. All figures link back to source records.

- [Methodology and sources](https://washingtonwelldata.com/methodology/): filters, statistics, cost method, corrections policy
- [Data changelog](https://washingtonwelldata.com/changelog/): every refresh, with record counts
- [Address lookup](https://washingtonwelldata.com/lookup/): wells near any Washington address

## County pages

- [Adams County](https://washingtonwelldata.com/counties/adams/): 1,882 wells, median depth 360 ft
- [Asotin County](https://washingtonwelldata.com/counties/asotin/): 818 wells, median depth 200 ft
- [Benton County](https://washingtonwelldata.com/counties/benton/): 8,352 wells, median depth 144 ft
- [Chelan County](https://washingtonwelldata.com/counties/chelan/): 7,524 wells, median depth 119 ft
- [Clallam County](https://washingtonwelldata.com/counties/clallam/): 9,516 wells, median depth 102 ft
- [Clark County](https://washingtonwelldata.com/counties/clark/): 20,265 wells, median depth 150 ft
- [Columbia County](https://washingtonwelldata.com/counties/columbia/): 459 wells, median depth 245 ft
- [Cowlitz County](https://washingtonwelldata.com/counties/cowlitz/): 9,867 wells, median depth 200 ft
- [Douglas County](https://washingtonwelldata.com/counties/douglas/): 2,297 wells, median depth 146 ft
- [Ferry County](https://washingtonwelldata.com/counties/ferry/): 2,825 wells, median depth 172 ft
- [Franklin County](https://washingtonwelldata.com/counties/franklin/): 3,089 wells, median depth 178 ft
- [Garfield County](https://washingtonwelldata.com/counties/garfield/): 291 wells, median depth 190 ft
- [Grant County](https://washingtonwelldata.com/counties/grant/): 9,634 wells, median depth 175 ft
- [Grays Harbor County](https://washingtonwelldata.com/counties/grays-harbor/): 4,821 wells, median depth 80 ft
- [Island County](https://washingtonwelldata.com/counties/island/): 6,772 wells, median depth 174 ft
- [Jefferson County](https://washingtonwelldata.com/counties/jefferson/): 4,777 wells, median depth 134 ft
- [King County](https://washingtonwelldata.com/counties/king/): 22,932 wells, median depth 120 ft
- [Kitsap County](https://washingtonwelldata.com/counties/kitsap/): 14,411 wells, median depth 130 ft
- [Kittitas County](https://washingtonwelldata.com/counties/kittitas/): 6,776 wells, median depth 193 ft
- [Klickitat County](https://washingtonwelldata.com/counties/klickitat/): 6,197 wells, median depth 260 ft
- [Lewis County](https://washingtonwelldata.com/counties/lewis/): 13,511 wells, median depth 100 ft
- [Lincoln County](https://washingtonwelldata.com/counties/lincoln/): 2,944 wells, median depth 235 ft
- [Mason County](https://washingtonwelldata.com/counties/mason/): 10,060 wells, median depth 116 ft
- [Okanogan County](https://washingtonwelldata.com/counties/okanogan/): 12,314 wells, median depth 134 ft
- [Pacific County](https://washingtonwelldata.com/counties/pacific/): 2,211 wells, median depth 25 ft
- [Pend Oreille County](https://washingtonwelldata.com/counties/pend-oreille/): 4,567 wells, median depth 146 ft
- [Pierce County](https://washingtonwelldata.com/counties/pierce/): 22,898 wells, median depth 116 ft
- [San Juan County](https://washingtonwelldata.com/counties/san-juan/): 5,782 wells, median depth 264 ft
- [Skagit County](https://washingtonwelldata.com/counties/skagit/): 7,950 wells, median depth 78 ft
- [Skamania County](https://washingtonwelldata.com/counties/skamania/): 1,747 wells, median depth 203 ft
- [Snohomish County](https://washingtonwelldata.com/counties/snohomish/): 18,532 wells, median depth 100 ft
- [Spokane County](https://washingtonwelldata.com/counties/spokane/): 27,758 wells, median depth 200 ft
- [Stevens County](https://washingtonwelldata.com/counties/stevens/): 12,449 wells, median depth 188 ft
- [Thurston County](https://washingtonwelldata.com/counties/thurston/): 19,230 wells, median depth 90 ft
- [Wahkiakum County](https://washingtonwelldata.com/counties/wahkiakum/): 506 wells, median depth 118 ft
- [Walla Walla County](https://washingtonwelldata.com/counties/walla-walla/): 4,476 wells, median depth 157 ft
- [Whatcom County](https://washingtonwelldata.com/counties/whatcom/): 11,300 wells, median depth 58 ft
- [Whitman County](https://washingtonwelldata.com/counties/whitman/): 1,694 wells, median depth 196 ft
- [Yakima County](https://washingtonwelldata.com/counties/yakima/): 18,185 wells, median depth 163 ft