20 years without an embedded superhero group have seen crime rise and become entrenched in the area. Going counter-clockwise around the Bay Area: San Francisco is mainly split between the Chinese and the Russians. The Tongs and Organizatsiya groups have roughly equal footing, each sharing about 40% of the ‘underworld’ economy: the rest is taken up by the top three supervillian groups.
As you move south towards Redwood City, Latin gangs take over the less dense urban areas and suburbs. Redwood City itself, and Hollywood, are solidly in control of the Russian Mafia but their influence ends when the main urbanization runs out. The entire south bay is given over to a mosaic of Latin gangs, and the debased Santaria cults (San Jose itself is a very low crime zone as far as gangs go. It’s underworld is controlled by The Machinist).
Going back up towards Oakland, the black gangs take over; tense turf wars break out every few weeks between black and latino gangs, each seeking a part of the shrinking pie. Oakland proper is ruled by a cabal of black gangs, topped by the Black Iron Diciples and the Caliphate.
The northern cities and Sacremento are given over to specifically the Mexican Mafia ( as oppossed to the Nuestra Familia that surrounds Redwood City and parts south), though the Russians are making serious inroads on their traditional sources.
The traditional La Cosa Nostra Mafia is not seen very much on the West Coast, though they have some strong interests in Hollywood. The only successful traditional Mafia family is the Cotroni Family who originally came down from Toronto. They have made a place for themselves in the cocaine market and seem comfortable running that business despite the Mexicans.