Common Mistakes Businesses Make About Legionella Prevention
Legionella prevention is an important responsibility for businesses that manage commercial properties, workplaces, residential buildings, healthcare facilities, hotels, and other premises with complex water systems. While many organisations understand that water safety matters, mistakes in planning, maintenance, and monitoring can increase the risk of Legionella growth.
The challenge is that Legionella bacteria often develop unnoticed. Problems may exist within plumbing systems, storage tanks, or water outlets long before anyone becomes aware of them. A proactive approach helps businesses identify risks early and maintain safer water systems.
Understanding common mistakes is the first step toward improving Legionella prevention practices.
1. Assuming Legionella Only Affects Old Buildings
One of the most common misconceptions is that Legionella is only a concern in older properties. While ageing plumbing systems can create challenges, newer buildings can also experience risks if water systems are poorly designed or managed.
Modern buildings may contain complex networks of pipes, storage systems, cooling equipment, and low-use outlets. If water remains stagnant or temperatures are not properly controlled, conditions may allow Legionella to multiply.
Every business should assess its own water system rather than assuming the age of the building determines the level of risk.
You can learn more about potential risk areas through this guide on where Legionella can develop.
2. Treating Legionella Prevention as a One-Time Task
Another mistake businesses make is completing a risk assessment and then forgetting about it. Legionella management requires ongoing attention because water systems and building conditions change.
Changes that may affect risk include:
- Plumbing upgrades
- Changes in occupancy
- Periods of low building use
- Equipment replacement
- Alterations to water systems
A water safety plan should be reviewed regularly to ensure it still reflects the current condition of the property.
A strong prevention strategy is an ongoing process rather than a single inspection.
3. Ignoring Stagnant Water
Stagnant water is one of the biggest concerns in Legionella prevention. When water sits unused for long periods, it can create conditions where bacteria have more opportunity to grow.
Businesses should pay attention to:
- Unused bathrooms
- Empty offices
- Closed facilities
- Infrequently used taps and showers
- Unused sections of pipework
Buildings that have reduced operations or temporary closures should have a plan for managing their water systems before reopening.
The Centers for Disease Control and Prevention (CDC) recommends addressing building water system conditions and implementing controls to reduce Legionella growth risks. (cdc.gov)
4. Failing to Maintain Proper Water Temperatures
Temperature control is a key part of Legionella prevention. Businesses sometimes overlook routine monitoring of hot and cold water systems, allowing conditions to become more favourable for bacterial growth.
Regular checks should include:
- Hot water storage temperatures
- Hot water return temperatures
- Cold water temperatures
- Areas where temperatures fluctuate
Without consistent monitoring, problems can remain hidden until they become more serious.
Businesses should include temperature checks as part of their wider building water safety procedures.
5. Not Having a Clear Responsibility Structure
A common organisational mistake is assuming someone else is managing Legionella risks.
Without clearly assigned responsibilities, important tasks may be missed, including:
- Completing inspections
- Reviewing records
- Arranging maintenance
- Responding to issues
- Updating procedures
Businesses should identify who is responsible for water safety management and ensure they have the knowledge and authority to take action.
A clear chain of responsibility helps prevent gaps in compliance.
6. Relying Only on Legionella Testing
Testing can be useful, but it should not replace proper prevention measures. Some businesses believe that regular testing alone is enough to control Legionella risks.
Testing provides information about water conditions, but it does not replace:
- Risk assessments
- System maintenance
- Temperature monitoring
- Water management procedures
Prevention works best when testing is combined with effective management practices.
The CDC recommends using a comprehensive water management program that identifies risks and establishes control measures. (cdc.gov)
7. Poor Record Keeping
Another frequent mistake is failing to keep detailed records. Documentation is important because it shows that prevention activities are being completed and allows businesses to track problems over time.
Useful records include:
- Risk assessments
- Maintenance reports
- Temperature checks
- Cleaning schedules
- Testing results
- Corrective actions
Good documentation also helps businesses demonstrate that they are taking water safety responsibilities seriously.
8. Overlooking Changes in Water Systems
Businesses often focus on their existing systems but fail to consider how modifications may introduce new risks.
Examples include:
- Adding new bathrooms
- Changing plumbing layouts
- Installing new equipment
- Reducing water usage in parts of the building
Any major change should trigger a review of Legionella risks.
Complex plumbing environments, particularly in larger urban buildings, can require additional consideration. Learn more about how infrastructure and plumbing challenges can influence water systems through this overview of cities and urban plumbing.
9. Not Training Employees
A Legionella prevention plan is only effective if the people responsible understand what they need to do.
Employees involved in facilities management should understand:
- Warning signs of water system problems
- Monitoring procedures
- Reporting requirements
- Emergency actions
Training helps create a stronger safety culture and reduces the chance of important tasks being overlooked.
10. Delaying Action After Identifying Risks
Some businesses identify potential Legionella issues but delay corrective action. Waiting can allow problems to become more difficult and costly to resolve.
When risks are identified, businesses should:
- Investigate the cause
- Take corrective measures
- Document actions taken
- Review whether controls are effective
Quick responses help maintain safer environments and protect building occupants.
A Simple Legionella Prevention Checklist for Businesses
Businesses should regularly review whether they are:
☐ Completing regular risk assessments
☐ Maintaining a water management plan
☐ Monitoring water temperatures
☐ Preventing water stagnation
☐ Maintaining plumbing systems
☐ Keeping accurate records
☐ Training responsible staff
☐ Reviewing changes to water systems
☐ Arranging professional support when needed
Final Thoughts
Legionella prevention requires more than occasional checks. Businesses need a structured approach that combines awareness, maintenance, monitoring, and accountability.
Avoiding common mistakes helps organisations create safer water systems and reduce potential risks for employees, customers, and visitors.
For additional information about Legionella risks, testing, and prevention strategies, explore more resources through the blog or get professional guidance through the contact page.
