The project entailed deployment of an on-site on-demand peracetic acid (PAA) disinfectant pilot system at a combined sewer storage facility in Akron, OH (Akron Rack 40). The pilot system was constructed and wet tested in Cincinnati, OH at EPA facilities and transported via trailer to the Akron site. The system produced a dilute peracetic acid disinfection solution via reaction of two industrial detergent powders (TAED - Tetraacetylethylenediamine and SPC - Sodium percarbonate) in a water matrix. The disinfectant was injected into a simulated combined sewer overflow (CSO) stream via mixing Little Cuyahoga River water with raw sewage drawn from the Akron sewer system. Samples were drawn after 5-minute, 10-minute and 15-minute contact time to determine efficacy of the system at reducing pathogens as primarily determined through E. coli inactivation. Sample sets from two trials were also analyzed for inactivation of Heterotrophic bacteria and Bacteriophage MS2 as surrogate for viral inactivation.