Certified Legionella Risk Assessment Services in the UK

Yes. Under the Health and Safety at Work Act and the COSHH Regulations, all landlords and employers have a duty to identify and assess the risk of exposure to Legionella. While you don’t necessarily need a “test certificate” (like an EICR), you must have a documented risk assessment to prove you have considered and managed the hazard.

Yes. Even a simple flat with a combi-boiler must be assessed. While the risk in these properties is often low, the law does not exempt them. For most domestic London rentals, a straightforward assessment by a competent Certivest engineer is sufficient to fulfill your legal obligations.

Current 2026 guidelines recommend a review every 2 years, or sooner if:
​The water system has been altered or moved.
​The building’s use has changed (e.g., converted from an office to a residential HMO).
​A new tenancy begins after a long void period (where water may have sat stagnant).

Our surveyor performs a physical audit of your water system, including:
​Temperature Profiling: We check that hot water is stored at 60°C and delivered at 50°C+, and that cold water stays below 20°C (the “danger zone” for bacteria is 20°C–45°C).
​Asset Inspection: Checking the condition of water tanks (looking for debris or lack of lids) and calorifiers.
​Identifying Dead Legs: Finding redundant pipework where water can sit stagnant and breed bacteria.
​Aerosol Risks: Inspecting showerheads, spray taps, and even decorative fountains or hottubs.

In most standard residential cases, laboratory testing is not required unless the risk assessment identifies a specific concern. However, for high-risk commercial sites or hospitals, we can provide full UKAS-accredited water sampling for peace of mind.

If a London property sits empty for weeks, water in the pipes becomes stagnant. This is a prime breeding ground for Legionella. At Certivest, we advise landlords to flush all taps and showers for several minutes before a new tenant moves in to clear the system.

Ditch the Scale: Regularly descale and disinfect showerheads (at least quarterly).
​Flush the System: If a guest room or secondary bathroom isn’t used often, run the taps for 2 minutes every week.
​Keep it Hot: Ensure your boiler is set high enough to kill bacteria in the tank.

Your digital Certivest LRA Report is typically emailed as a PDF within 24 hours. It includes a clear “Risk Rating” and an action plan if any remedial works (like removing a dead leg) are needed.

Water Type Target Temperature Purpose
Hot Storage 60°C Kills Legionella bacteria.
Hot Outlets 50°C+ (after 1 min) Ensures bacteria cannot survive in pipes.
Cold Outlets Below 20°C (after 2 mins) Keeps