As temperatures rise during the summer months, the risk of Legionella bacteria developing in workplace water systems increases. Legionella can cause Legionnaires’ disease, a serious type of pneumonia, making it important for businesses to understand how warmer weather affects water safety.
This article explores why summer poses a greater risk for Legionella growth in offices and other workplaces, and outlines practical steps to manage and reduce this risk effectively.
What is Legionella?
Legionella is a type of bacteria that thrives in water and can cause Legionnaires’ disease when inhaled through tiny water droplets, such as those from showers, taps, or air conditioning systems. It is not spread from person to person but can develop in man-made water systems, especially when conditions allow the bacteria to multiply.
Why Does Summer Increase Legionella Risk?
Legionella bacteria grow best in warm, stagnant water — typically between 20°C and 45°C. During summer, higher ambient temperatures can cause water in tanks, pipes, and other systems to reach these temperatures. Additionally, workplaces with reduced water use, such as those operating with hybrid or flexible working, may experience water stagnation, further encouraging bacterial growth.
Common Workplace Risk Areas
Infrequently used sinks, showers, or taps: Water sitting in pipes can warm up, creating ideal conditions for bacteria.
Water storage tanks: These can heat up during summer if not properly insulated or maintained.
Air conditioning and cooling towers: If not regularly cleaned, they may harbour Legionella.
Water features, humidifiers, or spa pools: Often overlooked but can be breeding grounds for bacteria.
Practical Steps to Manage Legionella Risk in Summer
1. Carry Out a Legionella Risk Assessment
Regular risk assessments identify vulnerable parts of the water system and help develop control measures.
2. Flush Infrequently Used Outlets
Running taps, showers, and other outlets regularly (at least once a week) helps prevent water stagnation.
3. Monitor Water Temperatures
Keep cold water below 20°C and hot water above 50°C at outlets to reduce bacterial growth risk.
4. Clean and Maintain Water Systems
Regular cleaning and descaling of showers, taps, and air conditioning units reduce biofilm and bacteria buildup.
5. Engage Water Hygiene Professionals
Specialists can help with testing, maintenance, and compliance to keep workplace water systems safe.
Conclusion
Summer brings warmer weather that can increase the risk of Legionella growth in workplace water systems. Understanding these risks and implementing effective control measures helps protect employees and visitors from Legionnaires’ disease. Regular monitoring, maintenance and professional assessments are key to maintaining a safe workplace all year round.
Need Help Managing Legionella or Other Health & Safety Compliance?
At Office Test, we offer expert Legionella risk assessment and control services tailored to your workplace needs. To learn more about our Legionella services and how we carry them out, visit our Legionella Risk Assessment page.
If you need assistance with Legionella management or any other health and safety compliance requirements, please get in touch by submitting the form below for a free advice call.
