Legionella Risk Factor: Temperature

One of the primary risk factors for Legionella growth is the temperature of the water. Typical healthcare, hotel, warehouse, and other facility water systems contain water that falls into the range of Legionella growth. Peak levels of growth are found in a specific range that is common in water systems during warmer months. The charts below show how temperature affects Legionella survival and growth under laboratory conditions.

Actual building water systems may differ from these laboratory conditions because water systems can contain sediment, biofilm, and other factors that affect Legionella growth.

Legionella Temperature Versus Growth

This chart illustrates the relationship between water temperature and Legionella growth.

Note: The above indicators are based on ideal laboratory conditions with new, clean pipes that do not have sediment, biofilm, or other conditions that may be present in an actual building water system.

Temperature Effects on Legionella Survival and Growth

The following chart shows the effects of temperature on Legionella survival and growth under laboratory conditions. The results should be considered alongside the conditions present in the facility’s actual water system.

Temperature Control and Water Management Plans

Want to control Legionella with temperature? A water management plan can help facilities evaluate temperature conditions and other factors affecting Legionella risk. Contact Legionella Control Systems at [email protected] or 317-620-8498 for solutions as well as Legionella testing, risk assessments, and remediation nationally. Our experienced engineers are ready to help.

Related Legionella Risk Factors

• Water age and stagnant water
• Disinfectant levels
• Scale and sediment
• What Legionella needs to survive

Contact Legionella Control Systems for a CDC Legionella risk assessment and Legionella testing.