March 15, 2024

Toolkit: Controlling Legionella in Common Sources of Exposure

This toolkit aims to provide actionable information on Legionella control measures to address hazardous conditions.
The information is specific to the water systems and devices that are commonly implicated sources of Legionnaires' disease outbreaks.
It helps focus and improve Legionella control efforts and protect our communities.

Cover of a toolkit for controlling Legionella in common sources of exposure.

About the toolkit

Use this toolkit to evaluate hazardous conditions in water systems and devices according to industry guidelines and CDC guidance.

Who should use these tools

This toolkit is intended for use by

Building owners and managers
Public health staff members

Feedback

CDC welcomes feedback on this toolkit. Email pneumonia-strep@cdc.gov with your thoughts and suggestions.

Download the complete toolkit in one file‎

All resources in toolkit are available in one print-ready PDF file. Each module can also be downloaded individually from the module-specific pages below.

Get the Legionella control toolkit

Toolkit resources

Illustration of devices that distribute potable water.

Controlling Legionella in Potable Water Systems

Tips to safely operate a potable water system and respond to cases of Legionnaires' disease.

Controlling Legionella in Cooling Towers

Guidance on operation, maintenance, and remediation of and control limits for cooling towers.

An illustration of 2 people sitting in a hot tub.

Controlling Legionella in Hot Tubs

Cleaning and disinfection are regular parts of safely operating a hot tub or whirlpool spa.

Controlling Legionella in Decorative Fountains

Tips to safely operate a decorative fountain and respond to cases of Legionnaires' disease.

Illustration of a water heater and a cold water tank.

Controlling Legionella in Other Devices

Cleaning and maintenance are a regular part of operating and maintaining plumbed devices.

Illustration of a technician sampling the potable water.

Routine Testing for Legionella

CDC provides guidance on routine Legionella testing (not testing related to case investigations).

Glossary

Terms, phrases, and definitions used in the Legionella Control Toolkit.