10 counties
Counties in Washington
- Chelan County1 water
- Douglas County1 water
- Ferry County1 water
- Grays Harbor County1 water
- King County1 water
- Klickitat County1 water
- Okanogan County5 waters
- Snohomish County1 water
- Walla Walla County1 water
- Yakima County1 water