Hazards associated with water systems in buildings include physical, chemical and microbial hazards. In 2013, NSF International, a public health and safety NGO, established education, training and certification programs in HACCP for building water systems. The programs, developed with the guidance of subject matter experts Aaron Rosenblatt and William McCoy center on the use of HACCP principles adapted to the specific requirements of domestic (hot and cold) and utility (HVAC, etc.) water systems in buildings, to prevent plumbing-associated hazards from harming people. Hazards addressed include scalding, lead, and disinfection byproducts as well as a range of clinically important pathogens, such as Legionella , Pseudomonas , nontuberculous mycobacteria (NTM), Acinetobacter , Elizabethkingia , and Naegleria . Early adopters of HACCP for building water systems include leading healthcare institutions, notably Mayo Clinic in Rochester, MN .