Legionnaires' disease is responsible for 4000 deaths each year, reported William McCoy, the chairman of proposed ASHRAE standard 188P, Prevention of Legionellosis Associated with Building Water Systems, and chief technology officer of Phigenics. The standard his committee is working on is open for public comment until March 11, 2013. Go here to see a draft of the standard: https://osr.ashrae.org/sitepages/showdoc2.aspx/ListName/Public%20Review%20Draft%20Standards/ItemID/840/IsAttachment/N/Std188P_3rdPPRDraftFINAL.pdf And go here to read an article about the standard: http://www.facilitiesnet.com/facilitiesmanagement/article/Facility-Managers-Responsibilities-for-Legionella-Prevention-Under-ASHRAE-188--13036