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Water mist systems (WMS) are used for evaporative cooling in public areas. The health risks associated with their colonization by opportunistic premise plumbing pathogens (OPPPs) is not well understood. To advance the understanding of the potential health risk of OPPPs in WMS, biofilm, water and bioaerosol samples (n = 90) from ten (10) WMS in Australia were collected and analyzed by culture and polymerase chain reaction ( PCR ) methods to detect the occurrence of five representative OPPPs:  Legionella pneumophila ,  Pseudomonas aeruginosa ,  Mycobacterium avium ,  Naegleria fowleri  and  Acanthamoeba .  P. aeruginosa  (44%, n = 90) occurred more frequently in samples, followed by  L. pneumophila  serogroup (Sg) 2–14 (18%, n = 90) and  L. pneumophila  Sg 1 (6%, n = 90). A negative correlation between OPPP occurrence and residual free chlorine was observed except with  Acanthamoeba ,  rs  (30) = 0.067,  p  > 0.05. All detected OPPPs were positively correlated with total dissolved solids (TDS) except with  Acanthamoeba . Biofilms contained higher concentrations of  L. pneumophila  Sg 2–14 (1000–3000 CFU/mL) than water samples (0–100 CFU/mL). This study suggests that WMS can be colonized by OPPPs and are a potential health risk if OPPP contaminated aerosols get released into ambient atmospheres.

Opportunistic Premise Plumbing Pathogens. A Potential Health Risk in Water Mist Systems Used as a Cooling Intervention