The Santa Susana Field Laboratory (SSFL), also known as Rocketdyne, is a former nuclear and rocket engine testing facility that is contaminated with radiological and chemical pollutants. The 2,850 acre site is near Simi Valley, Chatsworth, Canoga Park, Woodland Hills, West Hills, Westlake Village, Agoura Hills, Oak Park, Calabasas, and Thousand Oaks. For over twenty years, the Santa Susana Field Laboratory Work Group has served to keep the community informed about the contamination at SSFL and assure it is thoroughly cleaned up.