Both internal and external factors are contributing to the increase of Legionnaires’ disease cases. Manage these risks in system design.

Back in October 2020, Cory Powers wrote Part 1 of this article, introducing myself, and my Master’s capstone project focusing on one of the hottest topics in the plumbing industry — Legionella

Over the last century, pandemics have come and gone. From the 1918 Spanish Flu to the present day, millions have lost their lives to virulent strains of the influenza virus. COVID-19 and its variants are turning out to be one of those history-changing events. 

I have been writing for this magazine since 1994 and I have never visited their offices. On this trip, I was able to meet the new editor, Amalia Deligiannis. 

After more than 20 years of work in the Legionella field, leading outbreak investigations and resolutions as well as performing building audits, I’ve found the two single most critical variables for controlling Legionella risk are temperature and water age (time-to-tap).