John P. Crevelli was part of Sonoma County's environmental vanguard, which thwarted PG&E's plans to erect a nuclear power plant on an earthquake fault at Bodega Bay and fought to preserve public access to the cost. That victory was a defining moment for environmentalists far and near, as it gave heart to the notion that one can speak up and take action against a major power and win. Crevelli was a founding member of the group COAAST (Californian's Organized to Acquire Access to State Tidelands), formed in fellow Santa Rosa Junior College instructor Peter Leveque's classroom in 1968. COAAST, which originally consisted of seven men and four women, also included the late Bill Kortum, the dean of Sonoma County environmental activitists, and the late Chuck Kinkle, a former county supervisor who was recalled, along with Kortum, in 1976 in a move that paved the way from the board's first environmental majority. Also out of COAAST's endeavors came a very important piece of legislation, the 1972 Coastal Zone Conservation Act, parent of California's Coastal Commission. Crevelli authored "Bill Kortum: A Fifty Year History of Environmental Activism in Sonoma County," published after his death.
The John P. Crevelli Papers, dating from the 1960s through the 2000s, include correspondence, government documents, meeting minutes, newspaper clippings, newsletters, pamphlets, fliers, and ephemera on various county, state, and national environmental issues.