- Cascade Land Conservancy
Dedicated to the preservation of wetlands, shorelines, wildlife and rare plant habitat, stream corridors, and urban open spaces in communities throughout King, Snohomish, and Pierce counties.
- Clean Washington Center
State program to develop markets for recycled materials, providing technical assistance to manufacturers and producing reports and best practices on recycled materials use.
- Columbia Riverkeeper
Working to protect and restore the water quality of the Columbia River and all life connected to it.
- East Lake Washington Audubon Society
- Great Peninsula Conservancy
Nonprofit land trust working to protect the rural landscapes, natural habitats, and open spaces of Kitsap, Mason, and Western Pierce Counties.
- Hanford Reach: Save the Reach
Current information on the fight to save the last free flowing stretch of the Columbia River.
- Northwest Environment Watch
Independent research center fostering a sustainable economy and way of life.
- Northwest Straits Marine Conservation Initiative
A local approach to protecting and restoring marine resources and habitats in the northwest Washington counties of Island, Jefferson, Clallam, San Juan, Skagit Snohomish, and Whatcom.
- Quest for Economic Development
Private, nonprofit corporation, organized for the purpose of promoting diversified economic and cultural development while maintaining the environment in North Central Washington.
- Sierra Club - Cascade Chapter
- Sound Experience
Nonprofit organization offering environmental and leadership education and sail training aboard the National Historic Landmark schooner Adventuress (1913).
- Washington Environmental Alliance for Voter Education (WEAVE)
- Washington Environmental Council
Working to preserve, protect and restore Washington's wilderness.
- Washington Wilderness Coalition
Coalition of diverse individuals and groups working to protect and restore wilderness through outreach, education, organizing, and support of grassroots conservation groups.