Examines the response of enteric viruses to UV disinfection. Identifies a potential non-pathogenic biological surrogate that can be used in challenge tests for UV reactor validation at the high doses required for adenovirus inactivation. Evaluates dyed microspheres as UV dosimeters for high dose applications. Research partner: USEPA. Published in 2010. An addendum has been generated for this project due to information made available after this final report was published. Read the addendum.