California’s Office of Environmental Health Hazard Assessment has adopted a new Safe Harbor Levels for a pesticide listed under Proposition 65.
The agency set the regulatory limits for the pesticide Malathion, approving a No Significant Risk Level of 180 micrograms a day for the chemical.
The proposed NSRL is based on a carcinogenicity study in rodents and was derived using the methods described in Section 25703 of the Proposition 65 Regulations.
Malathion is a pesticide that is widely used in agriculture, residential landscaping, public recreation areas, and in public health pest control programs such as mosquito abatement and eradication programs. In the US, it is the most commonly used organophosphate insecticide.
Malathion has been used to combat crop losses from the Mediterranean fruit fly, and more recently to eradicate mosquitoes that carry the West Nile virus.
Malathion was listed as known to the state to cause cancer under Proposition 65 on May 20, 2016. The NSRL for malathion takes effect on April 1, 2018.