Energy Manager

ASHRAE Legionella Guideline Updated

This guide can be a particularly important aspect of plans to reopen buildings following the COVID-19 pandemic.

June 3, 2020  By Energy Manager Canada

ASHRAE has published an updated guideline to assist in control of legionellosis associated with building water systems.

The ASHRAE Guideline 12-2020, Managing the Risk of Legionellosis Associated with Building Water Systems, provides guidance useful in the implementation of ANSI/ASHRAE Standard 188, Legionellosis: Risk Management for Building Water Systems.

The guideline is intended for use by owners of human-occupied buildings and those involved in the design, construction, installation, commissioning, management, operation, maintenance, and service of centralized building water systems and components.

“ASHRAE Standard 188 gives direction regarding what to do to control the spread of legionellosis, such as to follow a risk management process, but does not necessarily explain how to do it in a prescriptive way” says Paul Lindahl, committee chair for ASHRAE Standing Standard Project Committee (SSPC) 188.


“Guideline 12 complements Standard 188 by providing detailed guidance for water management program teams to develop the necessary elements of an effective water management plan. This can be a particularly important aspect of plans to reopen buildings following the COVID-19 pandemic.”

Guideline 12 applies to spaces such as hotels, office buildings, hospitals and other health care facilities, assisted living facilities, schools, universities, commercial buildings, industrial buildings and centralized systems in multifamily residential buildings. Buildings with non-centralized water systems, and single-family residential buildings, though not included, may also benefit.

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