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 2 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 — check your local requirements or take advice before acting.