- Albion, WA — 15 chapters
- Arlington, WA — 21 chapters
- Bingen, WA — 12 chapters
- Black Diamond, WA — 20 chapters
- Camas, WA — 18 chapters
- Carnation, WA — 16 chapters
- Chelan, WA — 17 chapters
- Cheney, WA — 26 chapters
- Clark Regional Wastewater District, WA — 7 chapters
- Coal Creek Utility District, WA — 7 chapters
- College Place, WA — 16 chapters
- Cosmopolis, WA — 19 chapters
- Coupeville, WA — 14 chapters
- Darrington, WA — 19 chapters
- Dayton, WA — 19 chapters
- Duvall, WA — 15 chapters
- Ellensburg, WA — 17 chapters
- Elma, WA — 16 chapters
- Franklin County, WA — 19 chapters
- Gold Bar, WA — 18 chapters
- Grant County, WA — 23 chapters
- Grays Harbor County, WA — 17 chapters
- Harrah, WA — 37 chapters
- Island County, WA — 16 chapters
- Kalama, WA — 16 chapters
- Kelso, WA — 1 chapters
- Kennewick, WA — 19 chapters
- Kittitas County, WA — 1 chapters
- Klickitat County, WA — 24 chapters
- Lake Meridian Water District, WA — 13 chapters
- Lewis County, WA — 1 chapters
- Liberty Lake, Washington, WA — 74 chapters
- Long Beach, Washington, WA — 108 chapters
- Lynden, WA — 17 chapters
- Mabton, WA — 17 chapters
- Mason County, WA — 19 chapters
- McCleary, WA — 16 chapters
- Medical Lake, WA — 18 chapters
- Medina, WA — 16 chapters
- Mercer Island, WA — 17 chapters
- Millwood, WA — 17 chapters
- Morton, WA — 17 chapters
- Mossyrock, WA — 14 chapters
- Napavine, WA — 18 chapters
- Oakville, WA — 16 chapters
- Oroville, WA — 17 chapters
- Orting, Washington, WA — 152 chapters
- Pe Ell, WA — 20 chapters
- Pierce Transit, WA — 9 chapters
- Port Angeles, WA — 22 chapters
- Republic, WA — 16 chapters
- Ridgefield, WA — 21 chapters
- Roy, WA — 1 chapters
- Royal, WA — 17 chapters
- Ruston, WA — 24 chapters
- Sammamish Plateau Water District, WA — 9 chapters
- San Juan County, WA — 1 chapters
- Seattle, WA — 27 chapters
- Spokane County, WA — 14 chapters
- Stevenson, WA — 17 chapters
- Tacoma, WA — 5 chapters
- Tenino, WA — 20 chapters
- Thurston County, WA — 24 chapters
- Tieton, WA — 17 chapters
- Toppenish, WA — 16 chapters
- Union Gap, WA — 23 chapters
- Uniontown, WA — 16 chapters
- Vader, WA — 20 chapters
- Walla Walla County, WA — 20 chapters
- Warden, WA — 17 chapters
- Whatcom County, WA — 1 chapters
- White Salmon, WA — 17 chapters
- Whitman County, WA — 18 chapters
- Woodland, WA — 20 chapters