The potential clogging of landfill drainage systems was investigated, with particular emphasis on hazardous waste sites. The study accomplished five basic tasks: (1) to provide general background on the subject of drain clogging, (2) to examine the potential for clogging in leachate collection systems, (3) to investigate some cemented materials found in a drain at a landfill in Boone County, Kentucky, and to determine possible causes, (4) to identify preventive or remedial techniques for drain clogging, and (5) to identify methods that might minimize the likelihood or impact of clogging.