Understand the property’s water system
Legionella Risk Assessment
Review how a domestic hot and cold water system is used, including any storage, little-used outlets or periods without occupation.
WHAT IT INVOLVES
Know what you’re asking for.
The assessment considers the water system and how it is managed. A small occupied home and a property left empty for long periods may present different circumstances. Describe the system as far as you know it, together with changes in use. The proposed assessment should be proportionate to the property and identify any action that needs further attention.
What to discuss in the scope
- A review of the domestic water system and its pattern of use.
- Consideration of accessible storage and outlets within the agreed scope.
- Recorded findings and any recommendations arising from the assessment.
Before the visit
- Share previous assessments and records of changes to the water system.
- Mention empty periods and rooms or outlets that are rarely used.
- Arrange access to the relevant rooms and identify any known tanks or cylinders.
Worth knowing
Water sampling, laboratory analysis, disinfection and plumbing alterations are separate matters. A tailored quote should confirm the system covered, access limitations and provider availability. Larger or unusual systems need their own scope.
Further reading: HSE guidance on domestic water systems and legionella ↗. Guidance checked 17 October 2026.
Your questions, answered.
Does the assessment include a water test?
Sampling is not automatically part of a domestic risk assessment. Any reason for sampling, and its cost, should be explained separately.
Do I need to identify every pipe beforehand?
No. Share the records and information you have. Leave inspection of inaccessible parts to the appointed provider.
YOUR NEXT STEP
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