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Legionella Risk Assessment Tool

Legionella Risk Assessment Tool

Legionella Risk Assessment Calculator

Protect Your Water System & Prevent Deadly Outbreaks

Legionnaires’ disease is a severe, potentially fatal form of pneumonia caused by Legionella bacteria. Outbreaks are preventable but only if you proactively assess and manage your risks.

Did You Know?

  • Legionella thrives in warm water systems (20°C – 45°C).
  • Cooling towers, hot tubs, and plumbing systems are common breeding grounds.
  • 10% of cases are fatal so don’t wait for an outbreak to act.

✅ Take Control Now
Our free Legionella Risk Assessment Calculator helps you:
✔ Identify high-risk areas in your water systems
✔ Evaluate temperature, stagnation, and biofilm risks
✔ Prioritize corrective actions before it’s too late

⚠ Ignoring Legionella risks isn’t just dangerous as it’s costly. Fines, lawsuits, and reputational damage can cripple a business. Start your assessment now and stay compliant.

For simple plumbing systems use the Calculator Below to Assess Your Risk in Minutes!   

           

Legionella Risk Assessment Tool

Complete this form to assess the risk of Legionella in your property. A downloadable report will be generated.

Your Company Branding (Optional)

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Professional Branding

Add your company logo, details, and property photos to create professional branded reports. This section is optional but recommended for property management companies and consultants.

Supported formats: JPG, PNG for images. Logo will appear in header of PDF report. Company details will be included in report footer for professional presentation.
JPG or PNG format, max 2MB

1. Property Details

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Property Information

This section collects essential details about the property being assessed for Legionella risk. Accurate information is crucial for proper risk identification and regulatory compliance.

The property description should include building age, approximate size, typical occupancy levels, and any known water system issues or previous Legionella incidents.
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Qualified Assessor Identification

Name of the competent person conducting the Legionella risk assessment. Under UK HSE guidance, assessors should have appropriate training and experience in water system risk assessment and Legionella control.
50 characters remaining
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Assessment Timing and Frequency
Date when the on-site assessment was conducted. Regular assessments are required by law:

• Annually for most commercial properties
• Every 6 months for high-risk facilities (healthcare, hotels)
• After significant water system modifications
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Comprehensive Property Characteristics
Detailed description essential for accurate risk assessment including building age, construction type, number of floors, occupancy patterns, water system complexity, and any known issues.
500 characters remaining
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Multiple Photo Upload

To include up to 5 images, select multiple images when clicking "Choose Files". Hold Ctrl (Windows) or Cmd (Mac) to select multiple files. Each photo can have individual notes up to 200 characters.
Add photos of water systems, tanks, problem areas (up to 5 photos)
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Property Classification
Select the primary use of the property. Different types have varying risk levels and assessment requirements.

2. Room Inventory (max 20 rooms)

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Water Outlet Risk Assessment
Comprehensive documentation of all water-using fixtures is critical for Legionella risk evaluation. Focus on areas with spray-producing outlets first.
Room Name Hot
Taps		 Cold
Taps		 Shower Bidet Dish
washer		 Washing
Machine		 Action
Click to add a room
Maximum of 20 rooms reached. Remove some rooms to add more.
Click to Add a Room
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External Water Outlets Risk
External taps pose specific Legionella risks due to infrequent use, freezing potential, and stagnation. Regular flushing and winter drainage are essential controls.
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Total Outlet Count
This automatically calculates the total number of water outlets from the room inventory above. Higher outlet counts generally increase legionella risk.

3. Water System Details

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Water System Configuration Assessment
Critical section for evaluating Legionella risk potential through system characteristics. Temperature control is the primary defense against Legionella proliferation.
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Hot Water Storage Temperature Control
Storage temperature: 60°C or more continuously. Distribution: 50°C or more at all outlets within 1 minute. Temperatures less than 50°C allow Legionella survival and growth.
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Distribution System Temperature Monitoring
Temperature at the most distant outlet indicates system effectiveness. Target: 50°C or more within 1 minute of running tap.
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Cold Water Temperature Control
Cold water must remain less than 20°C to prevent Legionella multiplication. High temperatures may indicate poor insulation or routing near heat sources.
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Hot Water Storage System Assessment
Hot water storage tanks can promote Legionella growth if not properly managed. Storage systems require more stringent control measures than instantaneous heating.
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Tank Insulation Requirements
Proper insulation is essential for maintaining safe water temperatures and preventing dangerous temperature drops into the Legionella growth range.
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Cold Water Storage Assessment
Cold water tanks can harbor Legionella bacteria if not properly maintained. Storage tanks require regular inspection and maintenance protocols.
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Water Stagnation Risk Assessment
Stagnant water significantly increases Legionella risk. Identify all areas where water movement is restricted or outlets are rarely used.
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Maintenance Program Requirements
Regular maintenance is essential for effective Legionella risk control including temperature monitoring, cleaning, and descaling.
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Vulnerable Population Assessment
Certain groups face increased susceptibility to Legionnaires' disease. Presence of vulnerable users increases risk severity requiring additional control measures.
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Occupancy Pattern Risk Assessment
Unoccupied properties present increased Legionella risks through water stagnation and reduced monitoring.
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System Integrity and Contamination Indicators
Leaks and odors can indicate conditions favorable to Legionella growth. All issues require prompt investigation.
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Additional Assessment Information
Document any additional observations relevant to Legionella risk assessment including system modifications, unusual features, or access limitations.
1000 characters remaining

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