What is legionella?

Legionella is a bacteria that can cause Legionellosis, also known as Legionnaires’ Disease (a serious lung infection). There are close to 60 species of the bacterial genus Legionella, and Legionella pneumophilais is responsible for the majority of human cases. Legionella multiplies and survives within a temperature range of 77°F to 108°F (25°C to 42°C).

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1. What is legionella?
2. What are the sources of legionella?
3. What are the risks?
4. How does the City of Napa control and monitor for legionella in drinking water?
5. How can legionella be controlled in residential homes?
6. What are large building best practices for control of legionella?