Risk of Legionella from a decorative water wall in a hospital?

As part of a renovation/new building plan, an executive would like to put a water wall in the entrance of the hospital. Five glass panels will be put up and water will be recirculated for continuous flow. Do you see any potential problems with this presentation? In addition, there will be no barriers to prevent people from putting their hands in the water and creating a diversion of the water flow. 

We discourage the installation of decorative fountains in hospitals. However, the water wall in the photo that you provided, aerosolization is unlikely, so the risk would be very low. The water fountains can be treated with disinfectants such as chlorine or bromine.