The Department of Pesticide Regulation (DPR) regulates the sale and use of pesticides in California, including use on cannabis. The Medical Cannabis Regulation and Safety Act of 2016 and the Adult Use of Marijuana Act further require DPR to provide guidelines for the use of pesticides in the cultivation of cannabis and to provide the Bureau of Medical Cannabis Regulation guidelines on pesticide residue.
California Bureau of Medical Cannabis Regulation (BMCR) is the lead agency for cannabis regulation and is developing regulations along with the Department of Public Health (Office of Manufactured Cannabis Safety), and Department of Food and Agriculture (CalCannabis Cultivation Licensing). The three licensing agencies have issued draft regulations for manufacturing, cultivation, a track-and-trace system, laboratory testing, dispensaries, and other cannabis related activities.
Download the guidelines here.