Kimberlite Corporation is the worlds largest independent Sonitrol operator, with 11 franchises covering 18 counties in Californias Bay Area and San Joaquin Valley, including: San Francisco, Oakland, Alameda County, Contra Costa County, Berkeley/Richmond, Marin County, Sonoma County, Napa County, Solano County, Stockton, Modesto, Fresno and Bakersfield.