By: Daryn Cline, ASHRAE Member & Director of Environmental Technologies at EVAPCO, Inc. and Sarah Ferrari, Former Product Development Manager at EVAPCO, Inc. Legionnaires’ disease is on the rise. Unfortunately, efforts to prevent Legionnaires’ disease to date have focused on building water systems rather than the municipal water supply. Building water systems are too far downstream to correct the problem, and, as a result, these efforts have been ineffective in curbing the incidence of legionellosis. It is unrealistic to place on building owners and operators the burden and risk for providing