Canadian Water and Wastewater Association eBulletin

CDC releases new guide for controlling Legionella

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The U.S. Centers for Disease Control and Prevention (CDC) released a new guide for controlling Legionella in commonly implicated sources of Legionnaires’ disease outbreaks. The guide "Toolkit for Controlling Legionella in Common Sources of Exposure” addresses potable water systems specifically. Notably for potable water, CDC says that samples having less than 1.0 cfu/mL means the system is well controlled if other parts of the water management plan are working fine.

This latest guide complements earlier CDC guidance: "Toolkit: Developing a Water Management Program to Reduce Legionella Growth and Spread in Buildings” and "Guidance for Reopening Buildings After Prolonged Shutdown or Reduced Operation.”