Most homes do not need a legionella test
HSE is clear that routine legionella testing is not usually needed in domestic properties. The key controls are keeping hot water hot, cold water cold and water moving. A test result only tells you about the sample on that day.
Thermometer kits
A calibrated digital thermometer with a probe is the most useful 'kit' for most landlords and caretakers. It lets you check hot water reaches at least 50°C and cold water stays below 20°C. See our temperature guide.
Laboratory sample kits
These are sterile bottles you fill and post to a laboratory, which grows any legionella and reports a count in cfu/l. Results usually take around 10 days. Samples need to be taken and transported correctly, or the result may be meaningless.
Rapid and dip tests
Rapid tests can screen for legionella quickly, but they are not a substitute for UKAS-accredited culture results where those are required, and they do not replace a risk assessment.
When professional sampling makes sense
- Care homes and healthcare settings
- Hotels and holiday lets with spa pools
- Cooling towers
- After remedial work or disinfection
- Where temperatures cannot be controlled
Our testing service uses UKAS-accredited laboratories and explains results against HSG274.
Frequently asked questions
Is legionella testing a legal requirement for landlords?
No. Landlords must assess and control the risk, but routine testing is not usually required in rented homes.
Can I test for legionella at home?
You can buy sample kits to post to a laboratory, but for most homes a thermometer and good flushing habits are more useful than a test.
Disclaimer: This guide is general information about UK requirements and is not legal advice. Always check the current legislation and guidance for your premises.