The Midwest Technology Assistance Center (MTAC) was established October 1, 1998 to provide assistance to small public water systems throughout the Midwest via funding from the United States Environmental Protection Agency (USEPA) under section 1420(f) of the 1996 amendments to the Safe Drinking Water Act. This report summarizes all projects funded under USEPA Grant No. X829218-01, corresponding to funding received from federal fiscal years 2001, 2002, 2003, and 2004. MTAC was formed as a cooperative effort of ten Midwest states (congruent with USEPA regions 5 and 7), led by the Illinois State Water Survey and the University of Illinois. Dr. John Braden and Kent Smothers were the original Principal Investigators for this project. Kent Smothers has served as the Managing Director of the Center since its inception, and is responsible for overseeing the activities of individual project Principal Investigators and preparing and submitting quarterly and final reports. Dr. Richard E. Warner has been actively involved as an advisor to MTAC in his role as Director of the Illinois Water Resources Center at the University of Illinois, and has replaced Dr. Braden as the lead Principal Investigator for the project. The final report is organized by the fiscal years the projects were funded.The Midwest Technology Assistance Center (MTAC) was established October 1, 1998 to provide assistance to small public water systems throughout the Midwest via funding from the United States Environmental Protection Agency (USEPA) under section 1420(f) of the 1996 amendments to the Safe Drinking Water Act. This report summarizes all projects funded under USEPA Grant No. X829218-01, corresponding to funding received from federal fiscal years 2001, 2002, 2003, and 2004. MTAC was formed as a cooperative effort of ten Midwest states (congruent with USEPA regions 5 and 7), led by the Illinois State Water Survey and the University of Illinois. Dr. John Braden and Kent Smothers were the original Principal Investigators for this project. Kent Smothers has served as the Managing Director of the Center since its inception, and is responsible for overseeing the activities of individual project Principal Investigators and preparing and submitting quarterly and final reports. Dr. Richard E. Warner has been actively involved as an advisor to MTAC in his role as Director of the Illinois Water Resources Center at the University of Illinois, and has replaced Dr. Braden as the lead Principal Investigator for the project. The final report is organized by the fiscal years the projects were funded.