- Bay Area Action Home Page - Bay Area Action (BAA) is an environmental education and action organization in Palo Alto California,USA.
- California Planning and Conservation League - A non-profit environmental group protecting California's natural resources through direct political and legislative action.
- CalPIRG Unofficial Web Page - CalPIRG, the California Public Interest Research Group, is a student-run environmental and consumer protection organization.
- Camp Internet - RAIN is a non-profit community network in Santa Barbara, CA
- Catalina Conservancy Divers - CCD is the member support group of the Catalina Island Conservancy involved with marine biodiversity studies and ecological restoration
- Communities for a Better Environment - Nonprofit, multiracial urban environmental health organization.
- CRMP-California Coordinated Resource Management and Planning - CRMP is an interest-based process emphasizing local control and collaborative efforts with multiple stakeholders to reach consensus on natural resource management issues.
- Earth Communications Office (ECO) - A non-profit environmental organization whose goal is to use the power of communications to improve the global environment.
- Earth Island Institute - Feisty environmentalists. Hundreds of pages. Many full-text newsletters. Thirty projects in everything from dolphin, whales and sea turtles to environmental justice to rethinking paper.
- Earth Justice Ministries - Nonprofit organization to further the cause of social, economic and environmental justice
- Environet - Defending the earth, starting with the defense of the Angeles National Forest. The forest must not become a Dump !!!
- Environmental Council of Santa Cruz - Santa Cruz environmental groups umbrella organization. Nurtures cooperative network of environmental allies protecting, maintaining, enhancing and restoring Santa Cruz's natural environment
- Environmental Defense Center of Santa Barbara - Public interest law firm, education and advocacy center serving Santa Barbara, Ventura and Santa Barbara Counties in California
- Environmental Inequality - Maps and discussion of our current research of Silicon Valley. Very large Environmental Justice Bibliography
- Foothill Conservancy - Dedicated to protecting and enhancing the rural surroundings andquality of life in Amador and Calaveras Counties
- Forever Wild: Walkin' Jim Stoltz homepage - Multimedia website featuring "Walkin'" Jim commitment to preserve the wilderness and protect the planet's creatures.
- Friends of Friendship Park Home Page - Fighting to save Friendship Park from proposed development.
- Friends of the Garcia River - FrOG - We are a private non-profit watershed advocacy group. We focus primarily on timber and gravel extraction
- Global Action and Information Network - GAIN provides current news about environmental legislation. Also offers action-oriented background info on environmental and sustainability issues.
- Global Futures Foundation helps to resolve conflicts and unify business, social, and environmental interests
- Goldman Environmental Foundation - The World's Largest Prize Program for Grassroots Environmentalists.
- Labor/Community Strategy Center - An anti-corporate Los Angeles-based think/act tank focused on grassroots organizing around labor, environmental justice and transportation issues.
- Mendocino County Ecology Web One of the most active environmental communities in California, including group contact info, articles from the Mendocino Environmental Center newsletter, extensive links to many environmental-related sites in the world.
- Native Habitats - Advocacy for science-based native species & wilderness preservation & restoration
- Natural Resources Services - Nationally recognized non-profit developing and implementing projects which help improve quality and productivity of natural resources in Northern California.
- Pacific Institute for Studies in Development, Environment, and Security - A research and policy center working on global and regional issues related to the environment, sustainable development, and international security
- P-Flood, Floodplain, NFIP and Water - National association of floodplain managers with goal of reducing flood damages and preserving and enhancing natural values of floodplains
- Resource Renewal Institute (RRI) promotes Green Plans as the path to a sustainable environment and economy.
- Silicon Valley Environmental Partnership - Our mission is to stimulate development of the environmental industry and solve environmental problems by encouraging collaboration among industry, government, environmental groups and research and support organizations.
- Sonoma County Conservation Action - The county's largest environmental organization, reaching out to 50,000 households annually door-to-door.
- Suisun Marsh Natural History Association is an environmental organization focusing its efforts on the 55,000 acre Suisun Marsh and the surrounding area in Solano County, California.
- What on Earth? - Your Source for Science, Education and the Environment