This reports details the findings of the full-scale studies on UV Disinfection Systems done in Austin, Orem and Atlanta. Coverage includes impact of common water treatment chemicals on UV disinfection, UV reactor performance modeling, a state's acceptance of UV technology. Findings discuss the use of native spore formers used an indicator of full-scale performance, the UCV systems inactivated all the human enteric viruses and no infections viruses were detected, the most prevalent virus in wastewater samples was adenovirus.