Water Safety and Legionella Awareness for Short Term Rentals

Water in a short term rental can carry risks from scalding, from bacteria that grow in stored or little used water, and from poor hygiene in tanks, showers and hot tubs. The direct answer is that hosts should manage water as a system: control hot water temperature to prevent scalding, flush little used outlets between stays, keep tanks and showers clean, and seek professional assessment where the system is complex or a risk is suspected. Water that looks clear is not automatically safe.

Legionella awareness belongs in host management because the bacteria can grow in water systems held at favourable temperatures, particularly where water stagnates, and can be inhaled in aerosols from showers, taps and hot tubs. This guide gives general awareness only, not a risk assessment for any property, and hosts with complex systems should obtain a professional assessment rather than relying on general flushing advice.

A host should first understand the system: mains or private supply, storage tanks, water heaters, pipework runs, showers, baths, hot tubs and any outlet that is little used, such as a guest bathroom that sits empty between stays. A simple system with mains supply, a combi boiler and regularly used outlets carries lower risk than a complex system with large tanks, long dead legs and seasonal use, and the management effort should match that complexity.

Dead legs, where pipework leads to a removed outlet or an unused tap, allow water to stagnate and should be removed by a qualified plumber where possible. Long pipe runs from a heater to a distant tap allow water to cool to a favourable temperature range, and hosts should know where those runs are. A sketch of the system, kept with the property file, helps a professional assess risk and helps the host target flushing.

Hot water temperature control prevents scalding, particularly for children and older guests, while also forming part of bacterial control in a properly managed system. Thermostatic mixing valves, heater thermostats and tap temperatures should be checked between stays, and guests should be warned where a tap or shower runs very hot. A host should not set a heater to an extreme temperature to solve a bacterial concern without professional advice, because scalding risk rises with temperature.

Temperature checks should be recorded simply: date, outlet, temperature reading and any action taken. A record that shows regular checks and prompt action on anomalies evidences management, while a record with gaps suggests a system left to chance. Temperature control is a routine, not a one off setting, because heaters drift and valves fail.

Flushing means running little used taps and showers for a period before guests arrive, to replace stagnant water with fresh supply, and it is a standard general measure for properties with gaps between stays. Hosts should flush every outlet that has been unused, including guest bathrooms, outside taps and showers, and should do so in a way that avoids creating aerosols in an enclosed space, for example by running showers with the bathroom ventilated and the host not standing in the spray. The exact flushing routine for a complex system should follow professional advice.

Flushing does not replace cleaning, descaling shower heads, servicing heaters or assessing a complex system, and hosts should not present flushing alone as a guarantee of safety. Shower heads and hoses should be cleaned and descaled regularly, tanks should be inspected and cleaned on a professional schedule where present, and any suspected contamination should lead to professional assessment and, if advised, closure of the affected outlets until cleared.

Hot tubs carry higher water risk because warm, aerated water with multiple users and organic load is favourable to bacterial growth, and they require rigorous disinfection, testing and maintenance on a schedule matched to guest turnover. Hosts with a hot tub should follow the manufacturer's and any local requirements for treatment and testing, keep testing records, and close a hot tub whose treatment cannot be evidenced. A hot tub that is merely filled and left between guests is not managed.

Water features, decorative fountains and rarely used baths carry similar stagnation risks and should be managed or removed where management cannot be sustained. A feature that cannot be maintained to a safe standard should not be offered to guests, however attractive it looks in photographs. Safety governs the offer, not marketing.

Check local water safety and housing rules for temperature, flushing, tank and hot tub duties for the property and system type, obtain a professional risk assessment for complex systems, and record the date of the check. Keep temperature, flushing and treatment records with the property file.

This guide is general information only, not water safety advice for any property. Water rules vary by jurisdiction and system, and one system's routine must never be treated as a general routine. Before acting, verify the position with the official municipal code or registration portal for that address, and use qualified water professionals for assessment and complex work.