- Apex Solutions
- 3 days ago
- 3 min read
How Often Should Legionella Testing Be Carried Out?
Regular Legionella testing and risk assessments help businesses maintain compliance, protect occupants, and keep water systems safe.
Legionella bacteria can pose a serious health risk when allowed to develop within water systems. For businesses, landlords, and organisations responsible for managing buildings, understanding how often Legionella testing and risk assessments should be carried out is an important part of maintaining compliance and protecting occupants.
While there is no single rule that applies to every property, regular monitoring and review are essential for ensuring water systems remain safe and compliant with current health and safety guidance.
Is Legionella Testing a Legal Requirement?
UK health and safety regulations require duty holders to assess and control the risk of Legionella within their water systems. This includes employers, landlords, property managers, schools, healthcare providers, hotels, and many other organisations. A Legionella risk assessment is the starting point, helping identify any conditions that could allow bacteria to grow and spread throughout the system.
How Often Should a Legionella Risk Assessment Be Reviewed?
A Legionella risk assessment should not be viewed as a one-time exercise. While there is no fixed legal review period, assessments should be reviewed regularly and whenever significant changes occur.
This may include:
Changes to the Water System
Any alterations to pipework, water tanks, boilers, or outlets may affect the original assessment and require a review.
Changes in Building Usage
A property that experiences changes in occupancy levels or usage patterns may require reassessment. For example, buildings that become vacant for extended periods can experience water stagnation, increasing the risk of Legionella growth.
Following Maintenance Issues
If a water system experiences contamination, breakdowns, temperature control problems, or other maintenance concerns, the assessment should be reviewed to ensure risks remain controlled.
Routine Reviews
Many businesses choose to review their assessment annually as part of their wider health and safety procedures, even if no significant changes have occurred.
How Often Should Water Systems Be Monitored?
Monitoring requirements vary depending on the type of building and water system. Common monitoring activities include:
Temperature Checks
Hot water should generally be stored above 60°C, while cold water should remain below 20°C. Regular temperature monitoring helps ensure conditions remain unsuitable for Legionella growth.
Water Tank Inspections
Storage tanks should be checked periodically for signs of contamination, damage, debris, or stagnant water.
Outlet Flushing
Infrequently used taps, showers, and outlets should be flushed regularly to prevent water stagnation.
Water Sampling
In higher-risk environments, water samples may be taken periodically to confirm the effectiveness of existing control measures.
Which Properties Need More Frequent Monitoring?
Some buildings require closer monitoring due to the nature of their occupants or water systems.
Care Homes
Residents may be more vulnerable to Legionnaires' disease, making effective control measures particularly important.
Hotels and Hospitality Venues
Large water systems, guest turnover, and varying occupancy levels can increase risk.
Schools and Colleges
Water outlets may be unused during holidays and term breaks, increasing the potential for stagnation.
Healthcare Facilities
Hospitals and healthcare settings often have enhanced monitoring requirements due to vulnerable occupants.
Why Regular Testing Matters
Legionella control is about more than compliance. Effective monitoring helps identify problems before they become serious, protects building users, and demonstrates that appropriate safety measures are in place. Regular testing and assessment reviews can also help reduce the likelihood of costly remedial work, system downtime, or enforcement action resulting from unmanaged risks.
Frequently Asked Questions
How often should a Legionella risk assessment be reviewed?
Most businesses review their assessment annually, although reviews should also take place whenever significant changes occur within the building or water system.
Does every business need Legionella testing?
Not every property requires routine water sampling, but every duty holder must assess and manage Legionella risks within their water systems.
Can Legionella grow in cold water?
Yes. Although Legionella prefers warmer temperatures, cold water systems can still become a risk if temperatures rise or water becomes stagnant.
Who is responsible for Legionella compliance?
Responsibility typically falls to employers, landlords, building owners, property managers, or whoever has control over the water system.
What happens if Legionella risks are not managed?
Failure to manage Legionella risks can result in health issues, enforcement action, fines, reputational damage, and potential legal consequences.
Stay Compliant and Protected
Need help managing Legionella risks? Contact Apex Solutions Group for professional assessments, testing, and compliance support across Rugby, Coventry, and Warwickshire.
