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Article

Practitioners’ Perspective on the Prevalent Water Quality Management Practices for Legionella Control in Large Buildings in the United States

1
Department of Civil Architectural and Environmental Engineering, Drexel University, 3141 Chestnut Str. Curtis 251, Philadelphia, PA 19104, USA
2
Dornsife School of Public Health, Drexel University, Philadelphia, PA 19104, USA
3
Department of Population Health Sciences & the Public Health Program, Virginia Polytechnic Institute & State University (Virginia Tech), Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Hong Chen
Water 2022, 14(4), 663; https://doi.org/10.3390/w14040663
Received: 15 December 2021 / Revised: 29 January 2022 / Accepted: 8 February 2022 / Published: 21 February 2022
(This article belongs to the Special Issue Water Quality in Buildings)
Managing building water systems is complicated by the need to maintain hot water temperatures high enough to control the growth of Legionella spp. while minimizing the risk of scalding. This study assessed water quality management practices in large buildings in the United States. Surveys conducted with building water quality managers found that more than 85% of buildings have hot water temperatures that are consistent with scald risk mitigation guidelines (i.e., <122 °F/50 °C). However, nearly two thirds and three quarters of buildings do not comply with the common temperature guidance for opportunistic pathogen control, i.e., water heater setpoint > 140 °F (60 °C) and recirculation loop > 122 °F (50 °C), respectively; median values for both setpoint and recirculation loop temperatures are 10 °F (6 °C) or more below temperatures recommended for opportunistic pathogen control. These observations suggest that many buildings are prone to Legionella spp. risk. The study also found that 27% of buildings do not comply with guidelines for time to equilibrium hot water temperature, over 33% fail to monitor temperature in the recirculation loop, more than 70% fail to replace or disinfect showerheads, more than 40% lack a written management plan, and only a minority conduct any monitoring of residual disinfectant levels or microbiological quality. Given the rise in Legionellosis infections in recent years, coupled with highlighted water quality concerns because of prolonged water stagnation in plumbing, such as in buildings closed due to COVID-19, current management practices, which appear to be focused on scald risk, may need to be broadened to include greater attention to control of opportunistic pathogens. To accomplish this, there is a need for formal training and resources for facility managers. View Full-Text
Keywords: building water quality management; opportunistic premise plumbing pathogens (OPPPs); Legionella spp.; temperature control; COVID-19; recirculation loop; thermostatic mixing valve (TMV) building water quality management; opportunistic premise plumbing pathogens (OPPPs); Legionella spp.; temperature control; COVID-19; recirculation loop; thermostatic mixing valve (TMV)
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MDPI and ACS Style

Singh, R.; Chauhan, D.; Fogarty, A.; Rasheduzzaman, M.; Gurian, P.L. Practitioners’ Perspective on the Prevalent Water Quality Management Practices for Legionella Control in Large Buildings in the United States. Water 2022, 14, 663. https://doi.org/10.3390/w14040663

AMA Style

Singh R, Chauhan D, Fogarty A, Rasheduzzaman M, Gurian PL. Practitioners’ Perspective on the Prevalent Water Quality Management Practices for Legionella Control in Large Buildings in the United States. Water. 2022; 14(4):663. https://doi.org/10.3390/w14040663

Chicago/Turabian Style

Singh, Rajveer, Deepika Chauhan, Alanna Fogarty, Md Rasheduzzaman, and Patrick L. Gurian. 2022. "Practitioners’ Perspective on the Prevalent Water Quality Management Practices for Legionella Control in Large Buildings in the United States" Water 14, no. 4: 663. https://doi.org/10.3390/w14040663

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