Contemporary Practices to Assess Legionella Sources in Building Water Systems

Hosted by NEHA

Webinar | February 21, 2024, 1 pm ET

This webinar will present up to date (contemporary) information on Legionella and other biofilm-associated pathogens, while taking time to flag and dispel numerous myths and correct obsolete information, ideas, and theories related to its origins, habitat, susceptibilities, and remediation from building water sources.

Public health threats continue to rise from waterborne pathogens in drinking water, recreational waters, and unregulated aerosol sources such as cooling towers and decorative water features. Conditions that cause the colonization, amplification, and transmission of Legionella also support other biofilm-associated pathogens. When public health surveillance systems detect an outbreak of diagnosed disease it is critical to perform an effective and robust environmental source assessment to determine where amplification has occurred and to assess remediation efforts that should prevent future cases. Practical guidance, developed while working as public health officials or in cooperation with public health authorities and based upon dozens of outbreak investigations, will be presented. Since the first recognized outbreak of Legionnaires’ disease in 1976, public health authorities and various associations have issued a litany of guidance and research findings on where to look, how to sample, how to analyze, and how to interpret sample results for Legionella. While guidance on Legionella sources and its habitat have evolved over time many out of date ideas and myths have persisted. Additionally, some inaccurate information has been introduced about Legionella in recent years that interferes with efforts to reliably detect and remediate sources of exposure and disease.



J. David Krause, PhD, MSPH, CIH, FAIHA

Dr. Krause is the founder of Healthcare Consulting and Contracting (HC3). David received his Doctorate in Environmental and Occupational Health and Master of Science in Public Health Toxicology from the University of South Florida, College of Public Health in Tampa, FL. As a Certified Industrial Hygienist and Toxicologist, he has become a nationally recognized expert in the areas of risk assessment, aerosol-transmitted pathogens, hazardous chemicals, health care facilities, Legionnaires’ disease, combustion products, flame retardants, indoor air quality, and mold. From 2008 to 2011 Dr. Krause was the State Toxicologist for the Florida Department of Health. He co-authored the 2009 Guidelines for the Surveillance, Investigation, and Control of Legionnaires’ Disease in Florida and the AIHA Guideline for the Recognition, Evaluation, and Control of Legionella in Building Water Systems, 1st and 2nd editions. David is a member of the ACGIH Bioaerosols Committee, authoring chapters on Bacteria and Microbial Remediation in the ‘soon-to-be-released’ book Bioaerosols: Assessment and Control.

Robert E. McNeely, MS, CIH, CSP

Mr. McNeely is the Chief of Operations for Healthcare Consulting and Contracting (HC3). Robert is a Certified Industrial Hygienist who received his Master of Science in Industrial Hygiene from Montana Tech in 2021. For over 20 years he has investigated workplace and environmental health hazards related to chemical and biological agents, focusing on Legionella and other waterborne pathogens. Robert is currently an officer of the AIHA Indoor Environmental Quality Committee and has studied Legionella’s ability to colonize commonly used carbon filters. He has assessed the remediation of Legionella from over 100 building water systems related to many large, high profile disease outbreaks.