Determines the effect of blending waters on the final distribution system water quality. Examines the variations in aesthetic and regulated water quality parameters from blended waters with the seasons, including use of corrosion inhibitors. Also explores techniques to mitigate these variations. Includes bench and pilot studies in field evaluations. Tailored Collaboration partner: Tampa Bay Water. The project produced two reports. Effects of Blending on Distribution System Water Quality was published in 2005 (Order 91065F). Control of Distribution System Water Quality Using Inhibitors was published in 2008 (Order 91241).