Riverbank filtration (or induced filtration) is a process inwhich river water passes through the ground prior to its use as a drinking water supply. Alluvial aquifers that are hydraulically connected to rivers may provide alternate source water supply for water utilities. Riverbank filtration may provide a natural technology for many water treatment utilities in the US to meet regulatory requirements. European and US experience with riverbank filtration has shown that, during infiltration and underground transport, processes such as filtration, sorption, and biodegradation produce significant improvements in raw water quality. This paper presents the results of full-scale evaluation of riverbank filtration at three midwest water treatment plants. Includes 2 references, tables.