Ozone-enhanced biofiltration is widely used to achieve multiple water quality benefits and effectively removes odorants such as MIB and geosmin. This project aims to better understand ozone-enhanced biofiltration for MIB and geosmin removal by providing information on the such research gaps as: selection of appropriate ozone dosages; the role of biofiltration for direct oxidation; quantification of the extent of MIB and geosmin removal in well acclimated and controlled biofilters, and others.