Cooling towers and other ...
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
Cooling towers and other sources should be continuously disinfected and periodically cleaned. There are ASHRAE and other Guidelines:
Useful Resources from ASHRAE and Allied Associations on Reducing the Risk of Legionellosis

ASHRAE Standard 188-2015, Legionellosis: Risk Management for Building Water Systems
ASHRAE Journal article - Risk Management for Legionellosis
Articles and papers addressing legionella available in ASHRAE Bookstore