The Fraser Health Authority has confirmed a “cluster” of cases of Legionnaires’ disease in the Guildford area of Surrey BC.

The organization says public health officials are now trying to track down the source of the bacteria. Recent outbreaks of Legionnaires’ Disease have been traced back to biological growth in building water systems, decorative fountains and cooling towers.

Legionnaires’ Disease – or Legionella pneumophila – can be transferred in almost all ground and surface water sources. Legionella tend to grow in biofilms or slime on the surfaces of lakes, rivers. But they’ve also adapted to growing within water distribution systems such as cooling towers and evaporative condensers. In addition, Legionella live within certain types of amoeba and protozoa as endosymbionts, meaning that they can survive typical potable water chlorination and can appear in many finished water supplies in our buildings. Cooling tower drift (water loss) is a common cause of outbreak as the bacteria finds a suitable

Our team at BC Comfort want our clients and their clients to stay safe, so we are sharing some ways that you can minimize the risk of a Legionnaire’s contamination in your buildings.

Water quality and system maintenance should be well controlled in these cooling systems. The water treatment objectives are to maintain corrosion, deposit, fouling, and microbiological control. Biocide treatments play an important role in microbiological control programs. Bio-dispersants are an important aid for loosening microbial deposits and promoting system cleanliness. They enhance biocide effectiveness by penetrating the biofilm.

A cooling tower disinfection procedure is recommended at least 1-2 times per year in addition to your regular treatment program to help promote system cleanliness and disease prevention.


For more information on how you can protect yourself and your buildings from Legionnaires Disease, please contact your BC Comfort representatives.

For more information, please contact BC Comfort.