- Acterra: Action for a Sustainable Earth@
- Association for Environmental and Outdoor Education
 - Dedicated to the education of children and to helping them increase their awareness and understanding of their natural environment. - Audubon California
- Working to conserve and restore natural ecosystems, focusing on wildlife.
- California Center for Land Recycling
- Nonprofit organisation focused on creating sustainable communities by identifying and implementing responsible patterns of land use and development.
- California Center For Regional Leadership
- Promotes innovative regional solutions for economic, environmental, and societal challenges facing California.
- California Coastal Commission
- Dedicated to protecting California's coast.
- California Exotic Pest Plant Council (CalEPPC)
- Dedicated to finding solutions to problems caused by non-native pest plant invasions of the state's natural areas.
- California Fuel Cell Paternship
- A public/private project to demonstrate the potential for fuel cell-powered vehicles in California.
- California League of Conservation Voters
- Mobilises voters to support environmentally responsible candidates and issues.
- California Public Interest Research Group (CALPIRG)
- Nonprofit, non-partisan watchdog group working on behalf of consumers, the environment, and good government in California.
- California Resource Recovery Association
- Promotes resource conservation and recovery, producer responsibility, the practice of source reduction, reuse, recycling, repair and take back regulation toward attaining the goal of zero waste.
- California Wilderness Coalition
- Dedicated to protecting California's wild places and native biodiversity on a statewide level.
- Californians Against Waste (CAW)
- Waste reduction and recycling policy and legislation in California through bill summaries, action alerts, and newsletters.
- Earth Share of California
- Coordinates workplace fundraising campaigns to help restore habitat, preserve wilderness, protect drinking water, and educate people about the environment.
- Environment California
- CALPIRG's environmental programme focusing exclusively on protecting California's environment through advocacy and research.
- Environmental Defense Center
- Nonprofit public interest orgaization providing legal, educational, and advocacy support to advance environmental quality of California's South Central Coast.
- Environmental Professionals Organization
- Multi-disciplinary educational forum for environmental professionals in California.
- Nature Conservancy of California
- Northern California Recycling Association
- Association of recycling businesses, community groups, municipalities, and individuals committed to promoting, expanding, and institutionalizing recycling.
- Planning and Conservation League
- Alliance of citizens and conservation organisations united to protest and restore the quality of California's environment through legislative action.
- Play Not Spray
- News and information on the effort to halt the California Department of Food and Agriculture's eradication programme for the light brown apple moth in the San Francisco Bay Area. Features news, alerts, and links.
- Salmon Restoration Association
- Primary aim is to take positive, measurable action to restore the natural wild salmon runs to rivers of Northern California.
- Save the Redwoods League
- Sierra Business Council
- Alliance seeking to secure the economic and environmental health of the Sierra Nevada mountain region.
- Sierra Club (2)
- Tuolumne River Trust
- Working to protect and restore the Tuolumne River, one of the most ecologically diverse streams in the Sierra Nevads, and home to the largest natural salmon run in the San Joaquin valley.
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