Surface Water Protection Program’s Pesticide Evaluation Model (PREM), Version 6 Update

The Department of Pesticide Regulation (DPR) Environmental Monitoring Branch, Surface Water Protection Program (SWPP) uses simulation models for pesticide risk characterization in product registration evaluations, post-use monitoring, and data analysis. The Pesticide Registration Evaluation Model (PREM) is used to evaluate potential aquatic impacts of pesticide products submitted to California for registration. The first public version of the model was released in 2012. Since then, SWPP continues to improve PREM by updating modeling approaches and introducing new simulation capabilities for more realistic and California-centric predictions. The latest version of the model, PREM Version 5, was published in 2017. More information on SWPP’s PREM can be found on DPR’s Web site.