This document summarizes EPA's human health risk and drinking water exposure assessments for the methyl sulfate pesticide difenzoquat, (broadly classified as a pyrazole) as presented fully in the documents, 'Difenzoquat: HED Human Health Risk Assessment for the Tolerance Reregistration Eligibility Decision (TRED),' dated February 11, 2002, and 'EFED Drinking Water Exposure Assessment for the Tolerance Reregistration Eligibility Decision on Difenzoquat,' dated October 29, 2001. The purpose of this overview is to assist the reader by identifying the key features and findings of these risk assessments, and to better understand the conclusions reached in the tolerance reassessment.