Reducing This Risk
Basic principles for the control of legionella bacteria are based on:
- good turnover of water;
- maintaining temperatures either below 20°C or above 50°C; and
- maintaining good hygiene and cleanliness of a system.
During the COVID-19 pandemic, William Martin Compliance have seen a noticeable increase in cold water system operational temperatures, particularly during the summer months, and an increase in low level legionella detection particularly in cold water systems. These findings suggest a poorer level of control over bacterial activity than was seen prior to the COVID-19 pandemic. With most buildings adopting a system wide flushing regime, the indication is that the regime may be insufficient.