Legionella bacteria are found naturally in freshwater environments, like lakes and streams. The bacteria can become a health concern when they grow and spread in human-made building water systems like

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• Showerheads and sink faucets

• Cooling towers (structures that contain water and a fan as part of centralized air cooling systems for buildings or industrial processes)

• Hot tubs

• Decorative fountains and water features

• Hot water tanks and heaters

• Large, complex plumbing systems

After Legionella grows and multiplies in a building water system, water containing Legionella can spread in droplets tiny enough for people to breathe in. People can get Legionnaires’ disease or Pontiac fever when they breathe in small droplets of water in the air that contains the bacteria.

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Less commonly, people can get sick by aspiration of drinking water containing Legionella. This happens when water accidentally goes into the lungs while drinking. People at increased risk of aspiration include those with swallowing difficulties.

People do not generally spread Legionnaires’ disease and Pontiac fever to other people. However, this may be possible under rare circumstances.

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Most healthy people exposed to Legionella do not get sick. People at increased risk of getting sick are:

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• People 50 years or older

• Current or former smokers

• People with chronic lung disease (like chronic obstructive pulmonary disease or emphysema)

• People with weak immune systems or who take drugs that weaken the immune system (like after a transplant operation or chemotherapy)

• People with cancer

• People with underlying illnesses such as diabetes, kidney failure, or liver failure