Do I need a Legionella risk assessment?
Yes, an assessment is required; a certificate from a contractor is not.
3 min read · Updated 2 August 2026
Overview
Health and safety law requires landlords to assess the risk from Legionella bacteria in the water system. For most small domestic properties this is a short written assessment rather than a laboratory test, but the duty to assess and record is real.
Practical guidance
- Record the assessment in writing and review it after any change to the system or a long void.
- Flush outlets after voids and keep hot water above and cold water below the risk temperatures.
- Beware anyone selling a mandatory certificate — it is the assessment, not a certificate, that the law requires.
Related content
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.