Legionella (Legionnaires' Disease and Pontiac Fever)

alert iconMany businesses are closed during the COVID-19 outbreak. Stagnant, or standing, water can cause conditions that increase risk for Legionella and other biofilm-associated bacteria. Learn about steps to take before re-opening your business and building.

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The NEW Legionella Environmental Assessment Form Marking Guidepdf icon walks users through the Legionella Environmental Assessment Formpdf icon while providing instructions and additional considerations for the questions. Additional considerations sections provide helpful context about risk factors for Legionella growth and spread.

What is Legionnaires’ disease?

Legionnaires’ (LEE-juh-nares) disease is a serious type of pneumonia (lung infection) caused by Legionella (LEE-juh-nell-a) bacteria. People can get sick when they breathe in small droplets of water or accidently swallow water containing Legionella into the lungs.