Hot tubs that are not properly operated and maintained can provide an ideal environment for spreading Legionella, the bacteria that causes Legionnaires' disease and Pontiac fever. The phrase "hot tubs" in this document includes hot tubs, whirlpool spas, and hydrotherapy spas.
Failing to regularly scrub hot tub surfaces to remove biofilm, the slime layer that protects Legionella from disinfectants, and failing to maintain adequate disinfectant levels promotes Legionella growth. Hot tub users can be infected with Legionella when they breathe in tiny water droplets that contain Legionella.
CDC has not made any recommendations regarding routine laboratory testing for
While no scientific studies have been conducted to determine the best way to disinfect a hot tub contaminated with
Legionella, CDC recommends these best practices based on the scientific information that is currently available: