What the rules say
Health and safety law (HSE's L8 code) requires you to assess the risk from legionella and control it. For ordinary domestic water systems HSE says testing is not usually needed. The risk rises when water sits still, which is common between bookings and out of season.
What to do
- Write down your water system: tanks, cylinder, showers, rarely used outlets.
- Keep stored hot water at 60°C or above.
- Run all taps and showers for a few minutes before guests arrive after an empty spell.
- Descale and disinfect showerheads regularly.
Elsewhere in the UK
Scotland: A legionella risk assessment is also a mandatory licence condition.
Northern Ireland: The same duty applies, enforced by HSENI.
Tips from the field
- Add "flush taps and showers" to your cleaner's changeover checklist.
Common questions
Do holiday lets need a legionella risk assessment?
Yes. Health and safety law requires you to assess and control the risk from legionella in the water system you provide. HSE says most landlords can do this themselves without a professional.
Do I need to test the water for legionella?
Not usually, for an ordinary domestic water system. HSE says testing is not normally needed; controlling the risk is what matters. Hot tubs are different and need regular lab testing.
Why are holiday lets a higher legionella risk?
Water sits still between bookings and out of season, which lets bacteria grow. Running all taps and showers for a few minutes before guests arrive after an empty spell is one of the simplest controls.
What temperature should the hot water be?
Keep stored hot water at 60°C or above.
How often should I review my legionella risk assessment?
There is no fixed interval in law. Review it whenever anything changes, such as a new boiler or bathroom. Many hosts review it every 2 years.
Related guides
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Official sources
Costs are typical 2025/26 prices, not official figures. This is general information, not legal advice. Last checked 26 Sept 2026.