We have refreshed our website design. Learn more …

Model and Scenario Development Guidance for Estimating Pesticide Concentrations in Groundwater Using the Pesticide Root Zone Model

The Pesticide Root Zone Model Groundwater (PRZM-GW) was developed as a regulatory model to estimate pesticide concentrations in vulnerable groundwater sources as part of a North American Free Trade Agreement (NAFTA) to develop a harmonized groundwater modeling protocol. The Office of Pesticide Programs implemented the use of PRZM-GW as an exposure model in 2012.

This guidance describes the groundwater conceptual model and the methods for developing scenarios for the PRZM-GW model.

You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.