Legionella Control & Management
With an estimated 4,000 to 6,000 cases of Legionnaires' disease in the UK each year, effective water system management is critical. Use product-specific chlorine dioxide evidence and a validated control scheme to manage Legionella and biofilm risks.
Why Legionella Management Matters
An estimated 4,000 to 6,000 cases of Legionnaires' disease occur in the UK annually, often linked to poorly designed, installed, or maintained water systems (CIPHE). Effective Legionella control is both a legal requirement and essential for protecting building occupants, particularly in healthcare, hospitality, and commercial premises used by vulnerable people.
Healthcare Facilities
Hospitals, care homes, and dental practices require stringent Legionella management to protect vulnerable patients.
- HTM 04-01 compliance
- Continuous monitoring
- Risk assessment updates
Hotels & Hospitality
Water systems in hotels, gyms, and leisure centres require regular Legionella risk management.
- ACOP L8 compliance
- Guest safety protocols
- Shower & spa treatment
Cooling Towers
Industrial cooling systems are high-risk for Legionella proliferation and require specialist treatment.
- HSG274 Part 1 compliance
- Regular monitoring
- Biocide treatment
Commercial Buildings
Office blocks, shopping centres, and public buildings must manage water system Legionella risks.
- Written scheme of control
- Temperature monitoring
- Dead-leg management
UK Legal Requirements
Under ACOP L8 and the Health and Safety at Work Act 1974, employers and duty holders must assess and control Legionella risks in water systems. Failure to comply can result in prosecution, unlimited fines, and imprisonment.View compliance requirements
Legionella Control Measures
A comprehensive Legionella management programme combines multiple control measures. Chlorine dioxide is one chemical option within a site-specific Legionella control programme.
Chlorine Dioxide Treatment
Select chlorine dioxide only where product evidence covers the Legionella strain or biofilm organisms, water matrix, concentration, contact time and test conditions, followed by site validation.
- Biofilm control
- Very little THM/HAA formation
- Product-label dosing
- System pH assessment
Temperature Control
Maintaining hot water above 60°C and cold water below 20°C is fundamental to Legionella management, but often insufficient alone.
- Primary control method
- ACOP L8 requirement
- Regular monitoring needed
- Energy considerations
Risk Assessment
Regular Legionella risk assessments identify potential hazards and ensure control measures are effective and up to date.
- Legal requirement
- Identifies hazards
- Informs control scheme
- Regular review needed
Legionella Treatment with ClO₂
Chlorine dioxide is used for Legionella control where the selected product, written scheme and monitoring support it. ChloroKlean's liquid products make professional treatment accessible without expensive equipment.
Biofilm Management
Legionella can colonise biofilms. Any chlorine dioxide claim must be checked against the selected product's organism, matrix, concentration, contact time and test conditions.
Evidence-Led Selection
Use product-specific Legionella evidence and site sampling rather than applying a laboratory reduction or a case-study outcome as a universal dose or result.
No Generators Required
ChloroKlean products are liquid chlorine dioxide that activate in-situ without expensive generator equipment, making professional Legionella control accessible to all facilities.
BPR Compliant
All ChloroKlean products are GB BPR compliant, ensuring you meet regulatory requirements for Legionella control in the UK.
Materials Compatibility Assessment
Assess pipework compatibility using product-specific evidence for the exact product, materials, concentration, exposure time, temperature and water chemistry. Do not assume lower corrosion or longer system life.
Maintained Residual
A dosing system can be configured to target a measured residual. Demand, hydraulics, outlet monitoring and corrective action determine whether the control scheme performs as intended.
Site-Specific Legionella Results
Read each case study for its own system, sampling period and operating conditions. Outcomes from one site are not a product-wide reduction claim or dosing instruction.
Hospital Water System
Hospital presentation summaries depict later Legionella SG1 non-detection in hot and cold water. Original sampling records are unavailable; non-detection does not establish elimination or treatment causation.
Read case studyCooling Tower Treatment
Review the cooling-tower case study for the sampled system, treatment programme and reported Legionella result.
Read case studyLegionella Test Results
Review the test organism, water matrix, product concentration, contact time and test conditions before applying laboratory results.
View test resultsLegionella Control FAQs
Common questions about Legionella management and chlorine dioxide treatment.
Get Expert Legionella Control Advice
Contact our team for guidance on Legionella management, product selection, and dosing recommendations for your specific application.