How Facility Managers Can Reduce Legionella Risks
Facility managers play a vital role in maintaining safe building environments, and water safety is one of the most important responsibilities. In commercial buildings, healthcare facilities, residential properties, and public spaces, poorly managed water systems can create conditions where Legionella bacteria may grow.
Legionella is naturally found in water environments, but it becomes a concern when it multiplies inside building plumbing systems. Exposure can occur when contaminated water produces small droplets or mist through showers, faucets, cooling systems, or other water equipment.
Reducing Legionella risks requires a proactive approach. Facility managers can protect building occupants by understanding water systems, maintaining equipment, monitoring conditions, and following a structured prevention plan.
Understand How Legionella Risks Develop
The first step in reducing Legionella risk is understanding what allows bacteria to grow. Legionella typically becomes a concern when several conditions exist together, including:
- Warm water temperatures
- Stagnant water
- Low disinfectant levels
- Biofilm buildup
- Poorly maintained plumbing systems
Facility managers should regularly review building water systems to identify areas where these conditions may occur.
A clear understanding of Legionella behavior helps teams make better decisions. Learn more about the basics through this guide on Legionella explained.
Create a Building Water Safety Plan
A documented water safety plan provides a structured way to manage Legionella risks. Instead of reacting after a problem occurs, facility managers can use a prevention-focused approach.
A strong plan should include:
- Identification of water system components
- Risk assessments
- Monitoring procedures
- Maintenance schedules
- Corrective action steps
The plan should clearly define responsibilities so everyone involved understands their role in maintaining safe water conditions.
More information about creating effective water management strategies is available in this guide on building water safety.
Maintain Proper Water Temperatures
Temperature control is one of the most important tools for Legionella prevention. Facility managers should regularly monitor water temperatures throughout the building.
Important areas to check include:
- Water heaters
- Storage tanks
- Hot water return systems
- Building outlets
Problems can occur when temperatures become inconsistent or when parts of the system are not operating as intended.
Regular inspections help identify temperature issues early and allow maintenance teams to correct problems before risks increase.
Prevent Water Stagnation
Water that remains unused for long periods can create favorable conditions for Legionella growth. Facility managers should pay close attention to areas where water use is limited.
Examples include:
- Empty offices
- Vacant apartments
- Closed facilities
- Seasonal buildings
- Infrequently used fixtures
Helpful prevention steps include:
- Flushing unused outlets
- Maintaining water circulation
- Reviewing occupancy changes
- Removing unnecessary dead-end plumbing sections
Stagnation management is especially important after renovations, shutdowns, or extended periods of reduced building use.
Maintain Plumbing Systems
A well-maintained plumbing system is easier to manage and monitor. Facility managers should establish regular inspection and maintenance schedules for key components.
Important maintenance tasks include:
- Cleaning faucets and showerheads
- Inspecting storage tanks
- Checking valves and circulation equipment
- Monitoring water treatment systems
Over time, scale, sediment, and biofilm can develop inside water systems and create areas where bacteria may survive.
Understanding where Legionella can grow helps managers focus maintenance efforts. More details are available in this resource about where Legionella can develop.
Monitor Water Quality
Regular monitoring helps facility managers understand whether prevention measures are working.
Depending on the building and risk level, monitoring may include:
- Temperature checks
- Water quality measurements
- Disinfectant levels
- Legionella testing when appropriate
Testing can provide useful information, but it should support a complete water management program rather than replace routine maintenance.
Identify High-Risk Areas
Not all parts of a building water system carry the same level of risk. Facility managers should identify areas where Legionella may be more likely to develop.
Potential high-risk locations include:
- Cooling towers
- Hot water storage systems
- Showers and faucets
- Decorative water features
- Low-use plumbing areas
A targeted approach helps teams focus resources where they are most needed.
Train Maintenance Teams
Facility staff are a key part of Legionella prevention. Employees responsible for water systems should understand how risks develop and what actions are required.
Training should cover:
- Water safety procedures
- Monitoring requirements
- Maintenance schedules
- Emergency response steps
Clear training reduces mistakes and improves consistency across the facility.
Manage Changes to Building Systems
Building changes can affect water safety. Renovations, plumbing upgrades, occupancy changes, and equipment replacements may create new risks.
Before making changes, facility managers should review:
- How water flow may change
- Whether unused sections will be created
- Whether temperatures may be affected
- How new equipment impacts the system
A review process helps prevent unexpected water safety issues.
Prepare for Building Closures and Low Occupancy
Periods of reduced building use can increase Legionella concerns. Facilities that close temporarily or operate with fewer occupants may experience reduced water movement.
Examples include:
- Office closures
- Seasonal properties
- Vacant buildings
- Renovation periods
Before returning a building to normal use, facility managers should consider appropriate water system checks and recovery procedures.
Managing Legionella Risks in Large and Urban Buildings
Large facilities often have complex plumbing networks that require detailed planning. High-rise buildings, commercial developments, and urban properties may contain multiple water zones and extensive infrastructure.
Facility managers should consider:
- System design
- Building age
- Water movement patterns
- Maintenance history
Complex water networks require ongoing attention and coordination. More information about these challenges can be found in this overview of cities and urban plumbing.
Keep Accurate Documentation
Good record keeping supports effective Legionella management.
Facility managers should maintain records of:
- Maintenance activities
- Inspection results
- Testing information
- Repairs and improvements
- Staff training
Documentation helps identify patterns and demonstrates that safety procedures are being followed.
Work With Experienced Water Safety Professionals
Some buildings may require additional expertise, especially facilities with complex systems or vulnerable occupants.
Professional support can help with:
- Risk assessments
- Water testing strategies
- System reviews
- Prevention improvements
A collaborative approach can strengthen overall water safety efforts.
Final Thoughts
Facility managers are essential in reducing Legionella risks and maintaining safer water systems. Prevention requires consistent attention, from monitoring temperatures and maintaining plumbing equipment to managing stagnation and following a structured water safety plan.
Legionella control is an ongoing responsibility. By taking proactive steps and keeping water systems well managed, facility teams can reduce risks and create healthier environments for everyone who uses the building.
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