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Legionella Control (HSE)
Temperature control is the primary method used to control the risk from Legionella.
Water services must be managed and controlled at suitable temperatures that will prevent Legionella Proliferation (growth) such as:
- Hot water storage cylinders (calorifiers) should store water at 60°C or higher
- Hot water should be distributed at 50°C or higher
- Cold water should be stored and distributed below 20°C.
- Thermostatic mixer valves (TMV) need to be fitted within 1.5 metres of the outlet it supplies.
Your Legionella Control (HSE) manager should frequently inspect, monitor and maintain the water system, in accordance with the site risk assessment.
Sentinel outlets (nearest and furthest to stored hot and/or cold water) should be identified so that monthly checks of distribution temperatures can be carried out. Stored hot water temperatures should also be checked and reviewed every month and stored cold water tank temperatures at least every six months.
As stagnant water provide Legionella bacteria an ideal environment for growth, dead legs/dead ends in pipe-work should be removed. Infrequently used outlets, (especially aerosol generating outlets such as showerheads) should be flushed on a weekly basis. All outlets that generate a spray (showers and spray taps) should be cleaned and descaled on a quarterly basis. Cold-water storage tanks should be cleaned periodically and all water should be drained from hot water cylinders to check for debris or corrosion.
Water sample analysis can be used as an additional control method for systems that are presenting temperatures out with the control parameters.
Who is a landlord?
In relation to domestic gas under the Gas Safety (Installation and Use) Regulations 1998 (GS(IU)R 98), a landlord is anyone who rents out a property that they own under a lease that is shorter than 7 years or under a licence. Regardless of whether you are a landlord under GS(IU)R 98 you may be considered a landlord under other related legislation.
Landlords’ duties apply to a wide range of accommodation, occupied under a lease or licence, which includes, but not exclusively:
- residential premises provided for rent by local authorities, housing associations, private sector landlords, housing co-operatives, hostels
- rooms let in bed-sit accommodation, private households, bed and breakfast accommodation and hotels
- rented holiday accommodation such as chalets, cottages, flats, caravans and narrow boats on inland waterways.