Legionella Risk Assessment & Water Hygiene Twickenham

Landlords must assess and control legionella risk in rented property. For most single-let homes that is a straightforward written assessment; HMOs and commercial premises need a fuller control scheme.

A typical flat or house takes under an hour on site with the report issued within a few working days. Commercial buildings depend on the number of outlets and plant items.

Yes. Dead leg removal, tank cleaning and chlorination, TMV servicing and calorifier work are all done in-house, so nothing has to be sub-contracted.

A legionella risk assessment is required where health and safety duties apply, including workplaces and rented homes. Landlords and employers must identify and manage the risk, but this does not automatically mean paying for specialist testing or obtaining a certificate. A straightforward domestic system may need only a simple assessment by someone competent. Owner-occupiers generally have no equivalent legal duty for their own home, although maintaining safe water temperatures and avoiding stagnation remain sensible precautions.

You can use an online tool to record a legionella risk assessment, but it cannot replace checking the actual water system. A competent person needs to understand the pipework, storage tanks, water temperatures, little-used outlets and who could be exposed. For a simple property, someone with sufficient knowledge may carry out those checks and complete the paperwork online. Complex systems or vulnerable occupants may require specialist help; an automatically generated document alone does not demonstrate that risks are controlled.

Yes, free legionella risk assessment templates are available online, but a template is only a recording tool, not an assessment by itself. Choose one that covers the water system, vulnerable users, storage and outlet temperatures, stagnation, existing controls and required actions. Use Health and Safety Executive guidance to check its scope. Complete it using actual property checks, assign responsibility for any actions, and review the assessment when changes could affect the risk.

Legionella infection usually follows breathing in fine droplets of contaminated water, rather than simply drinking it. Plumbing risks increase where water stagnates, temperatures stay around 20–45°C, or scale and biofilm build up in tanks, pipework and showerheads. Legionnaires’ disease can cause serious pneumonia, particularly in older people, smokers and those with weakened immunity or chronic lung disease. Regularly using outlets, maintaining appropriate temperatures and cleaning showerheads help reduce the conditions that allow bacteria to multiply.

Start by identifying the water supply, tanks, heaters, pipework and outlets, then consider who could inhale water droplets and whether anyone is especially vulnerable. Check temperatures, little-used taps, redundant pipework, tank condition and maintenance arrangements. Assess whether existing controls prevent stagnation and bacterial growth, then record findings, actions and responsibilities. The assessor must be competent for the system’s complexity. Review after relevant changes or if controls fail; routine water sampling is not usually necessary for straightforward domestic systems.

Early symptoms of Legionnaires’ disease can include fever, headache, muscle aches and a cough, followed by breathlessness or chest pain as pneumonia develops. Some people also experience diarrhoea or confusion. Symptoms typically begin 2–10 days after exposure, but they cannot confirm legionella without medical assessment. Seek urgent medical advice if symptoms follow possible exposure to contaminated water droplets, and mention that exposure. Call 999 for severe breathing difficulty or sudden confusion.

The most common way to catch Legionnaires’ disease is by breathing in tiny airborne water droplets containing Legionella bacteria. Sources can include showers, spa pools and cooling towers when their water systems are contaminated. It is not normally spread from person to person, and drinking contaminated water is not the usual route. In plumbing systems, controlling water temperatures, preventing stagnation and maintaining tanks and showerheads helps reduce the risk of exposure.

Legionella bacteria can be killed by sufficiently high temperatures or properly controlled chemical disinfection. In hot-water systems, storing water at 60°C or above and distributing it so it reaches at least 50°C within one minute at outlets are common control measures, with scald protection where needed. Cold water should stay below 20°C where practicable; cold does not kill the bacteria. Thermal disinfection needs competent supervision because of scalding risks, and persistent contamination may require specialist treatment.