
- Ada County, Idaho
- Ada County Highway District, Idaho
- Allied Technology Group, Inc
- Battelle Seattle Research Center
- Bechtel, Inc.
- Bonneville Power Administration
- Burlington Northern Santa Fe Railway
- California Department of Health Services
- Canadian Consulate General
- Ch2M Hill
- City of Anacortes, WA
- City of Arlington, WA
- City of Auburn, WA
- City of Bellevue, WA
- City of Bothell, WA
- City of Carnation, WA
- City of Everett, WA
- City of Everson, WA
- City of Federal Way, WA
- City of Lake Forest Park, WA
- City of Lynnwood, WA
- City of Kenmore, WA
- City of Kirkland, WA
- City of Marysville, WA
- City of Mercer Island, WA
- City of Portland, OR
- City of Renton, WA
- City of Sammamish, WA
- City of Shoreline, WA
- City of Seattle, WA
- City of Seattle Department of Parks and Recreation, WA
- City of Seattle Department of Transportation, WA
- City of Seattle Office of Economic Development, WA
- City of Tacoma, WA
- Children’s Hospital and Regional Medical Center, Seattle
- Clark County, WA
- Golder Associates
- Idaho Department of Environmental Quality
- Idaho Transportation Department
- King County Department of Natural Resources and Parks
- King County Department of Transportation
- King County Office of Economic Development
- Neighborhood Business Council
- Oregon Department of Transportation
- Pierce County, WA
- Port of Bellingham, WA
- Port of Olympia, WA
- Port of Seattle, WA
- Port of Tacoma, WA
- Portland Development Commission
- Puget Sound Energy
- Puget Sound Regional Council
- Ross Island Sand & Gravel
- Sauk County, WI
- Seattle City Light
- Seattle Public Utilities
- Skagit County Public Works
- Snohomish County, WA
- Sound Transit
- Tacoma Cascade Alliance
- Thea Foss Participants Group
- Tri-County Water Resource Agency
- U.S. Air Force
- U.S. Army Corps of Engineers
- U.S. Department of Defense
- U.S. Department of Energy
- U.S. Environmental Protection Agency
- U.S. Navy
- Washington State Department of Ecology
- Washington State Department of Fish and Wildlife
- Washington State Department of Health
- Washington State Department of Social and Health Services
- Washington State Department of Transportation
- Washington State Ferries
- Washington State Energy Facility Site Evaluation Council
- Washington State House of Representatives
- Washington State Major League Baseball Stadium Public Facilities District
- Whatcom County
- Woodland Park Foundation
- Wyoming Department of Environmental Quality