Effective Immediately: Healthcare Facilities Required to Reduce Legionellosis Risks from Tap Water. On June 2, the Department of Health and Human Services, Centers for Medicare and Medicaid Services (CMS) issued a memo that will undoubtedly expand the awareness of Legionella risks and further drive the implementation of preventative approaches. For more information please read Water Conditioning and Purification’s report by clicking here! And remember, Lifestream offer’s a wide variety of AER/hospital water filters. Please check out our AER filter web-pages and please contact us if you have any questions!