Free tool

Legionella risk checker

Answer ten quick questions about your building to get an instant indication of legionella risk and practical next steps.

1. Who uses the building?

Healthy adults only Some older or vulnerable people Care, healthcare or very vulnerable users

2. Does the building have stored hot water (a cylinder or calorifier)?

No, combi or instantaneous only Yes, a domestic cylinder Yes, large calorifiers

3. Is there a cold water storage tank?

No Yes, with a tight lid Yes, lid loose, missing or unknown

4. Are there showers or spray outlets?

No A few, used daily Many, or some rarely used

5. Are any outlets used less than once a week?

No A few Yes, several, or rooms often empty

6. Has the building been empty or underused in the last few months?

No Partly Yes, for weeks or more

7. When running, does hot water reach 50°C within a minute?

Yes Not sure No

8. Does cold water fall below 20°C within two minutes?

Yes Not sure No

9. Do you have a spa pool, hot tub, cooling tower or humidifier?

No Not sure Yes

10. Do you have a current written legionella risk assessment?

Yes, under two years old Yes, but older or out of date No

Frequently asked questions

Is this checker a legionella risk assessment?

No. It gives an indication of risk based on common factors. A legal risk assessment needs a competent person to survey the actual system.

Is my data stored?

No. The checker runs in your browser and nothing you select is sent to us.