A legionella risk assessment water system review is a legal requirement for almost every food outlet in the UK, yet it is one of the most overlooked compliance duties in hospitality. Restaurants, cafes, takeaways, pubs and hotels all run hot and cold water systems capable of creating fine sprays, and those sprays are exactly how Legionella bacteria reach the lungs. As water treatment specialists who design, install and maintain systems across demanding commercial environments, Sovereign Water understands where the real risks sit in a busy kitchen and front of house, and how to control them without disrupting your operation.
This guide explains what a legionella risk assessment water system check involves, why food outlets carry a particular risk profile, what the law expects of you as a business owner, and the practical control measures that keep both your customers and your staff safe. The aim is straightforward: help you understand your duties and protect your premises. If you would like a hand reviewing your site, our team can arrange a free water system assessment.
TL;DR
- A legionella risk assessment water system review is legally required for food outlets under the Health and Safety at Work Act, COSHH and the HSE Approved Code of Practice L8.
- Legionella multiplies between 20°C and 45°C, so the biggest risks are warm, stagnant water, dead legs and infrequently used outlets.
- Food outlets carry added risk from spray taps, ice machines, beverage lines, glass washers and combination ovens that can all create or harbour contaminated water.
- Control rests on temperature management, removing stagnation, regular flushing and keeping clear records, reviewed at least annually.
- Sovereign Water helps food outlets assess, treat and maintain their water systems, and offers a free site assessment to get you started.
What is a legionella risk assessment water system check?
A legionella risk assessment water system check is a structured review of every part of your premises that stores, heats, moves or releases water, carried out to identify conditions that allow Legionella bacteria to grow and spread. It records where the risks are, who could be exposed, and the control measures needed to manage them. For a food outlet, it covers everything from the cold water tank to the spray tap at the wash-up station.
Legionella is a naturally occurring bacterium found in low numbers in mains water. The problem begins when it enters a building water system that gives it the warmth, stagnation and nutrients it needs to multiply. Legionnaires' disease, a serious and sometimes fatal form of pneumonia, is contracted by breathing in small water droplets containing the bacteria. A competent assessor traces your pipework, measures water temperatures at the tank and at outlets, inspects components for scale, sludge and biofilm, and reviews how often each outlet is actually used. The output is a written assessment and an action plan, not just a tick-box certificate.
Why food outlets carry a particular Legionella risk
Food outlets carry a heightened Legionella risk because their water systems are more complex and more variable than a typical office. A restaurant or hotel combines high-demand peaks with quiet periods, multiple hot and cold outlets, and equipment that both heats water and produces sprays, which is the precise combination Legionella thrives on. Seasonal trading and partial closures make the problem worse by leaving water to stagnate.
Consider a typical site. There are wash-up areas with spray taps, glass washers and dishwashers, hand basins that may sit unused for hours, ice machines, beverage and coffee equipment fed from the mains, and combination ovens that inject steam. Outdoor or seasonal areas, staff showers and rarely used cloakroom taps add further dead legs where water sits warm and still. Each of these is a potential breeding ground or a route for aerosols to form. The complexity is why a generic assessment written for an office rarely fits a kitchen, and why the assessment should be carried out by someone who understands foodservice operations.
Legionella bacteria multiply most readily in water between 20°C and 45°C, especially where there is stagnation, scale or biofilm to feed on. Source: Health and Safety Executive (HSE) guidance HSG274.
Your legal duties as a food business
If you run a food outlet with staff, you have a legal duty to assess and control the risk of exposure to Legionella, and a legionella risk assessment water system review is the foundation of meeting it. The duty sits within the Health and Safety at Work etc. Act 1974 and the Control of Substances Hazardous to Health Regulations 2002 (COSHH), with detailed expectations set out in the Approved Code of Practice known as L8 and the technical guidance HSG274.
In practice, the responsible person, usually the business owner, manager or a nominated duty holder, must ensure a suitable and sufficient assessment is carried out, that identified controls are put in place, and that records are kept. The Approved Code of Practice L8 has a special legal status: following it is one way to demonstrate compliance, and if you do not follow it you must be able to show you have managed the risk to an equivalent standard. You can read the framework directly on the HSE Legionnaires' disease pages and in the Approved Code of Practice L8. This is a duty that local authority environmental health officers can and do check during food hygiene inspections.
Where Legionella hides in a food outlet water system
Legionella hides wherever water sits warm and still, so in a food outlet the main culprits are dead legs, infrequently used outlets, oversized or poorly insulated storage, and equipment that holds water at warm temperatures. Identifying these locations is the core purpose of the risk assessment, because you cannot control a risk you have not mapped.
Dead legs and redundant pipework
A dead leg is a section of pipe where water cannot flow freely, often left behind when equipment is removed or a layout changes. Water stagnates there, warms to room temperature and becomes an ideal breeding ground. Kitchen refits are a common cause, so any food outlet that has changed its layout should have its pipework re-checked.
Infrequently used outlets
Cloakroom taps, staff showers, outside taps and seasonal bar areas can sit unused for days. Without regular flushing, the water in these branches stagnates. A simple, logged flushing routine is one of the most effective and lowest-cost controls available.
Equipment that creates or stores warm water
Ice machines, glass washers, combination ovens, coffee and beverage systems and calorifiers all interact with the water system. Some store water at warm temperatures, others create sprays and aerosols. These need to be included in the assessment and maintained properly, not treated as separate from the plumbing.
Exposure to Legionella usually happens when contaminated water is broken into a fine spray or mist, for example from spray taps, showers or certain equipment, and then breathed in. Source: Health and Safety Executive (HSE).
Temperature control: the numbers that matter
Temperature is the single most important control for Legionella, because the bacterium grows in a defined window and is suppressed outside it. The accepted approach is to keep hot water hot, cold water cold, and water moving, so it never sits for long in the 20°C to 45°C growth range. These thresholds form the backbone of most control schemes for food outlets.
Hot water should be stored at 60°C or above and distributed so it reaches at least 50°C at the outlet within one minute of running. Cold water should be kept below 20°C, again checked at the outlet within two minutes of running. Where very hot water at the tap creates a scalding risk, particularly in customer-facing areas, thermostatic mixing valves are used at the point of use rather than lowering the system temperature, since reducing stored hot water temperature would undermine Legionella control. Regular temperature monitoring at sentinel outlets, the nearest and furthest taps on each loop, confirms the system is performing as intended.
Practical control measures and record keeping
Effective Legionella control in a food outlet comes down to a small number of disciplined routines: managing temperatures, removing stagnation, maintaining equipment, and recording what you have done. None of these is technically complex, but they must be carried out consistently and evidenced, because under L8 you have to be able to demonstrate compliance, not just claim it.
A practical control scheme for a food outlet typically includes flushing infrequently used outlets weekly, monitoring temperatures at sentinel outlets monthly, cleaning and descaling spray taps and shower heads quarterly, and inspecting and cleaning cold water storage tanks annually. Equipment such as ice machines and beverage systems should be serviced on a planned schedule. Every action is logged so there is a clear record for inspectors and insurers. Because Legionella control overlaps with food safety, integrating it into your existing Hazard Analysis and Critical Control Points (HACCP) and maintenance routines keeps it from being forgotten. The assessment itself should be reviewed at least annually, and sooner if you change your layout, your equipment, or how the premises are used. Our Smart Maintenance programme can take on the scheduling and record keeping so nothing slips.
How Sovereign Water supports food outlets
Sovereign Water supports food outlets across the full water system, from understanding the incoming supply to maintaining the equipment that depends on it, which puts Legionella control in its proper context rather than treating it as an isolated task. As water treatment specialists working in demanding commercial and hospitality environments, we see how water quality, equipment protection and compliance connect, and we help operators manage all three together.
Our involvement starts with a free site assessment, where we review your water system, test the incoming supply, and identify the risks specific to your premises and equipment. From there we can specify and install appropriate treatment, protect your beverage, ice and steam equipment with fit-for-purpose filtration, and keep everything maintained and documented through our Smart Maintenance programme. With expertise across both UK and challenging Gulf water conditions, we design pre-treatment that suits the local supply, which matters wherever incoming water is hard, high in dissolved solids or variable. You can explore our water dispensers and beverage systems to see the equipment side of that support. The result is a single, responsive partner for your water, from consultation to aftercare.
Frequently Asked Questions
Is a Legionella risk assessment a legal requirement for a restaurant or cafe?
Yes. Any business with a water system that could create breathable sprays must assess and control the risk of Legionella under the Health and Safety at Work Act and COSHH. For food outlets with staff, a written legionella risk assessment is expected, and following the HSE Approved Code of Practice L8 demonstrates compliance.
How often should the risk assessment be reviewed?
Review it at least every two years as a minimum, and ideally annually for a busy food outlet. You should also review it sooner whenever you change the water system, install or remove equipment, alter the layout, or change how the premises are used, since any of these can create new risks.
What temperatures stop Legionella growing?
Legionella grows between 20°C and 45°C. To control it, hot water should be stored at 60°C and reach 50°C at the tap, while cold water should stay below 20°C. Keeping water moving and avoiding stagnation is just as important as the temperatures themselves.
Do ice machines and coffee equipment need to be included?
Yes. Ice machines, beverage systems, coffee equipment and combination ovens all connect to the water system and can hold or release water at risky temperatures. They should be included in the assessment and kept on a planned service schedule, which also protects them from scale and extends their life.
Can Sovereign Water help my food outlet manage this?
Yes. We offer a free site assessment, specify and install fit-for-purpose water treatment, and maintain your system and equipment through our Smart Maintenance programme, keeping clear records for compliance. We support sites in both the UK and the GCC region.
Ready to protect your food outlet and stay compliant?
Sovereign Water helps restaurants, cafes and hotels assess, treat and maintain their water systems, keeping you compliant and your equipment protected, all backed by a free site assessment and Smart Maintenance support. Get a free consultation.