The San Francisco Bay Study Unit was sampled between 4/23/2007 and 6/21/2007; 97 wells were sampled.
The San Francisco Bay Study Unit consists of 1 study area.
• Santa Clara ground-water basin (consists of: Westside, Islais Valley, Marina, Lobos, Downtown, South San Francisco, Vistacion Valley Basins)The study unit is within the San Francisco, San Mateo, Santa Clara, Alameda and Contra Costa counties.