Regional Groups

Some of the Chapter's activities are organized by location. The Chapter is home to the following Regional Groups. Please click on the Group name to visit its website.

Peninsula Group


The Peninsula Regional Group (PRG) is the largest regional group in the Loma Prieta Chapter. Members who live in the cities from the southern boundary of San Francisco to the southern boundary of Sunnyvale, are automatically assigned to PRG unless they submit a request to join another regional group.

PRG organizes our Chapter’s Environmental Stewardship Program that provides educational presentations, films, webinars, and projects. Our activities include legislative actions, preventing plastic pollution, and expediting the transition to clean energy. 

For new and existing members—if you would like to engage in meaningful environmental protection work and meet like-minded others, we invite you to get in touch with us, so that we can get you started! Contact Sue at

San Carlos/Belmont Group


Our members are residents of San Carlos and Belmont, California, though residents of surrounding cities in San Mateo, Half Moon Bay, Redwood Shores, and Menlo Park also join our programs. We try to keep abreast of the environmental consequences of projects proposed by the cities of Belmont, San Carlos, San Mateo, and Redwood City. We work with the cities and developers to bring attention to and make these projects environmentally responsible through book groups, blogs, and social media. 

Guadalupe Group

Guadalupe Regional Group photo

We serve a large and populated geographical area, from Cupertino in Northwest Santa Clara County to San Juan Batista in San Benito County. Our service area is diverse, and the home of Silicon Valley.   

Our focus is on creating more open space for everyone to enjoy, by advocating for open space and construction of new housing close to mass transit. We are also involved in Climate Change mitigation and prevention.

Areas of interest include Coyote Valley, a vital linkage for wildlife between the Santa Cruz and Diablo ranges. Having a corridor for wildlife to mix is essential to increase genetic diversity.   

We have an ongoing effort to reach underserved communities and promote the Sierra Club vision of Explore, Enjoy, and Protect.

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