The first U.S. standard for the prevention of Legionnaires’ disease was published by the American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE) on June 26, 2015. The normative sections of the standard include development of a Water Management Plan for building water systems and devices including open and closed circuit cooling towers and evaporative condensers. ASHRAE Standard 188 will be shared to help inform these decisions so that they are evidence-based and defensible.


By providing guidance to prevent the growth and spread of Legionella, ASHRAE 188 created a framework that will manage building water systems proactively and reducing Legionella growth potential. If facility and building managers follow Standard 188, it can help to prevent many cases of legionellosis.


ASHRAE 188 defines the following:

  • The types of devices and buildings that need a water management program
  • How often programs should be updated and/or reassessed
  • Minimum components that need to be in a water management system
  • Water management team inclusion
  • What devices need to be controlled to prevent the growth and spread of Legionella

TP16-22 ASHRAE Legionella Standard 188: Evidence-Based Interpretation and

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