- Association of Monterey Bay Governments (AMBAG)
 - Forum for planning, discussion, and study of regional problems of mutual interest to the counties and cities in Monterey, San Benito, and Santa Cruz Counties. - Butte County Association of Governments
- Features news and information.
- California Coastal Conservancy
- Acts with others to preserve, protect and restore the resources of the California Coast.
- California Institute for County Government (CICG)
- California Tahoe Conservancy
- Works to improve water quality in Lake Tahoe, preserve the scenic beauty and recreational opportunities of the region, provide public access, preserve wildlife habitat areas, and manage and restore lands to protect the natural environment.
- Colorado River Board of California
- Council of Fresno County Governments
- Sponsored by the Council of Fresno County Governments. Online public information service including regional transportation guide, a citizen's guide, carpool and air quality information, regional data, and more.
- East Bay Municipal Utility District (MUD)
- Kern Council of Governments
- KernCog is an association of city and county governments created to address regional transportation issues.
- Sacramento Area Council of Governments
- Providing a forum for regional planning and collaboration in the Sacramento Metropolitan Area.
- San Diego Association of Governments(SANDAG)
- San Francisco Bay Conservation and Development Commission
- Established to prevent the unnecessary filling of San Francisco Bay and to increase public access to and along the Bay shoreline.
- San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy
- San Joaquin River Conservancy
- San Luis Obispo Council of Governments
- Features information on programmes and projects, publications, agendas, and more.
- Santa Monica Mountains Conservancy
- Yucaipa Valley Water District
- Provides water, wastewater, and water reclamation service to the cities of Calimesa and Yucaipa.
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