Need Legionella Testing? Why Starting with a Legionella Risk Assessment Might Be Smarter

Studies suggest that Legionella bacteria are found in approximately 50% of building water systems, and that number is higher for those that are larger, taller, or have complex plumbing systems. This information can be alarming, prompting facility managers to immediately test for Legionella.

However, a single set of Legionella testing provides only a brief snapshot of the plumbing system condition on a specific day at a specific time. Given how dynamic water systems are, this method may miss underlying risks. A more effective approach is conducting a comprehensive Legionella risk assessment with an ASSE 12080 certified engineer, which provides a more complete view of potential vulnerabilities and ways to manage them.

Here is why a risk assessment can be more effective than relying solely on testing:

• Limited scope of testing: Water quality and Legionella levels can vary significantly depending on temperature changes, water stagnation, and usage patterns. A Legionella test only shows the conditions on that specific day, often missing periods of higher risk, like warmer summer or fall months. This does not mean you should not test, but that Legionella testing provides just one small piece of data.
• Complete system evaluation: An engineering based onsite Legionella risk assessment reviews the entire water system, including plumbing design, and plumbing equipment also examining factors like biofilm buildup, water temperature regulation, and stagnant zones, all of which contribute to Legionella growth.
• Proactive prevention: Identifying vulnerabilities allows for preventive measures such as adjusting water temperatures, improving circulation, automating flushing or scheduling regular maintenance. This reduces the chances of Legionella contamination before it becomes a problem.
• Lower liability: Performing a Legionella risk assessment demonstrates that proper precautions have been taken. It is also always the foundation of a new water management program or helps with optimizing an existing program. In case of a Legionella-related incident, this due diligence can help reduce legal exposure and liability associated with Legionella.
• Potential cost savings: Not every building will require frequent testing or expensive remediation after a Legionella risk assessment. Often, simply adjusting management practices based on the information from an independent Legionella engineer can lower the risk without costly interventions.
• Custom solutions: A risk assessment is customized for each building, factoring in its unique characteristics, usage patterns, and infrastructure. This provides a targeted, effective action plan that addresses specific vulnerabilities rather than applying a one-size-fits-all approach that many companies will try to push.

While Legionella testing is very important, it is limited in scope and provides incomplete information. A well-structured risk assessment offers a more thorough understanding of the system, helps prevent issues before they arise, reduces liability, and often saves money in the long run. A Legionella risk assessment is the key to managing Legionella risks more effectively.

Contact the technical team at Legionella Control Systems for more information. Our independent expertise can give you peace of mind and a plan that works for your budget.