https://www.siliconvalley.com/2024/09/19/contra-costa-county-made-wine-has-a-new-appellation-heres-what-to-know/

You’ve heard of Napa, Sonoma and the Santa Cruz Mountains AVAs, the designated wine-growing regions known as American viticultural areas. Now, there’s a new one: a Contra Costa AVA.

The territory, which covers eastern Contra Costa County from Pleasant Hill and Concord up to Martinez and along the Carquinez Strait to Pittsburg, Antioch, Oakley and Brentwood, was initially proposed by the Contra Costa Winegrowers Association. It took more than four years for the federal Alcohol, Tobacco Tax and Trade Bureau to assess, but the AVA boundaries were officially approved this spring.