 In 2009 and 2010, the Santa Monica–Malibu Unified School District did a polychlorinated biphenyls (PCB) cleanup of Malibu High School overseen by the California Department of Toxic Substance Control.During a 2011 construction project on the Malibu Middle and High Schools and Juan Cabrillo Elementary School, contractors discovered soils were contaminated with PCBs and organochlorine pesticides like chlordane and DDT and presented “an unacceptable health risk”.In October 2013, 20 teachers jointly complained about health problems, including thyroid cancer.