“…The loss of chloramine is a possible concern in premise plumbing because it might allow for regrowth of Legionella in hot water heaters. Legionella , an opportunistic pathogen, has recently been identified as a major cause of waterborne disease outbreaks ( PM Engineer , 2008; Strickhouser, 2007; Edwards et al, 2005). Limited data collected to date strongly indicate that chloramine is usually far superior to free chlorine in terms of Legionella control because of the longer persistence of chloramine disinfectant in the absence of nitrification (Strickhouser, 2007; Flannery et al, 2006; DeGraca, 2005; Kool et al, 1999a, b).…”