This report presents the results of efforts by the Great Lakes Basin Commission Staff to update and integrate the findings and recommendation of the International Joint Commission's Pollution from Land Use Activities Reference Group (PLUARG) with other related studies. The report concentrates on four difference areas: 1)update of major water quality studies and resource planning and management programs and projects related to Great Lakes water quality concerns, 2)update of pollutant loadings to the Great Lakes from U.S. sources, 3)results of a survey of current agricultural research into the causes and control of nonpoint source pollution, and 4)reconsideration of PLUARG findings and recommendations in light of new information.