Ecotopia by Ernest Callenbach

We are in the year 1999. Ecotopia, comprising what used to be Northern California, Oregon, and Washington, declared its independence in 1980. Since then, it has been isolated from the rest of the country. When an official investigator is finally admitted, partially urged on in secret by the president of the United States, he is equal parts horrified and impressed by what he finds. His confusion of values deepen, and reaches a startling crisis at a beautiful hot springs resort outside San Francisco...

Banyan Tree Books 1975 paperback edition in okay condition, see photos.