Legionella risk assessments for rented property
Landlords have a duty to assess the risk of legionella exposure from water systems, though most domestic systems present a low risk when properly maintained.
4 min read · Updated 27 August 2026
Overview
Landlords have a duty to assess the risk of legionella exposure from water systems, though most domestic systems present a low risk when properly maintained.
What is required
An assessment of the water system, which can often be a simple visual check for standard domestic properties rather than a formal survey.
Higher risk features
Water tanks, infrequently used outlets, and complex systems in larger HMOs increase risk and may need a more detailed assessment.
Simple control measures
Keeping hot water above 60°C, cold water below 20°C, and flushing unused outlets between tenancies reduces risk significantly.
Documenting your assessment
Keep a dated record of the assessment and any actions taken, even where the conclusion is that risk is low.
Frequently asked questions
Do I need a certificate for legionella?
No. There is no statutory certificate. You need a proportionate written risk assessment and a record of the control measures you have taken.
Can I assess the risk myself?
Yes, for a typical domestic let a landlord or agent can carry out a simple assessment. Complex systems, stored water or vulnerable occupiers may justify a specialist.
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This guide is general information for UK landlords and letting agents, not legal advice. Rules differ across England, Wales, Scotland and Northern Ireland, so check your local requirements or take advice before acting.