Legionella prevention encompasses water treatment strategies and maintenance protocols designed to eliminate Legionella pneumophila bacteria from cooling systems, which can cause severe respiratory illness. The bacteria thrives in warm water between 68°F and 113°F, making cooling towers and hot water systems primary infection sources.
Prevention Strategies
Effective measures include maintaining water temperature above 131°F in hot water systems, chlorination at 2-5 ppm residual, regular system flushing, and biannual cleaning of internal piping. ASHRAE 188-22 standards require risk assessments, water testing every 3-6 months, and documentation of all treatments.
Regulatory Compliance
Most jurisdictions mandate Legionella testing and preventive maintenance for buildings with cooling towers serving 5 or more floors. Regular monitoring prevents outbreaks that cause hospitalization and potential litigation. Proper treatment costs approximately $500-1,500 annually per tower but prevents costly facility closures and health department fines.