Headquartered in Sacramento, Western Health Advantage is a non-profit HMO health plan founded in 1996 with a community-based mission by doctors and health care providers.  WHA is consistently recognized for quality and delivering value to our members. With a focus on being a market leader in affordability since its inception, WHA serves 13 Northern California counties (Sacramento, El Dorado, Placer, Yolo, Colusa, Solano, Napa, Sonoma, Marin, San Francisco, San Mateo, Alameda and Contra Costa).