How can legionella be controlled in residential homes?

Residential customers can reduce or eliminate potential exposure to Legionella by setting their water heater at or above 140 F (60 C ). This is in accord with U.S. Centers for Disease Control (CDC) guidelines and Standard 188 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), which specifies how to set up and implement a water management program to control Legionella. However, maintaining such high water temperatures can introduce a scalding risk, so thermostatic mixers may be used to minimize this risk. 

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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?