Legionella control in Kuwait comes down to one hard job: stopping water from sitting warm. Almost every restaurant, café, hotel and cloud kitchen here stores water in a tank before it reaches the taps, and in a Kuwaiti summer that tank, and the pipes leading from it, can spend weeks at the temperatures Legionella prefers. This guide follows the water from the roof tank to the spray tap, shows where the bacteria get a foothold, and sets out the checks that keep a food outlet's system safe.
TL;DR
- Legionella bacteria multiply in water between about 20°C and 50°C. Breathing in contaminated spray or mist is how people get Legionnaires' disease.
- In Kuwait the risk sits mostly on the cold side: roof tanks, warm risers and pipes in hot service voids.
- The World Health Organization's targets are hot water leaving the heater at 60°C or more and cold water below 25°C, ideally below 20°C.
- Shade and insulate tanks, keep them sealed and turning over, flush idle taps weekly, and log temperatures monthly.
- A written risk assessment ties it all together and is what inspectors and insurers increasingly ask to see.
Want a Legionella risk assessment, or a second pair of eyes on your premises? Talk to Our Team.
In this article
- Where Kuwait's water comes from, and why storage matters
- Stage by stage: tank, riser, heater, outlet
- What temperatures to aim for
- Tank hygiene and the water tank filter question
- Writing it down: the risk assessment
- Biocides, and UV as an extra layer
- Frequently asked questions
- Sources
Where Kuwait's water comes from, and why storage matters
Kuwait has no rivers, so most of its fresh water is produced by seawater desalination. The Ministry of Electricity, Water and Renewable Energy publishes the output of its distillation plants every month in its Statistical Monthly Book.
Water leaving the network is treated, but the risk to your customers is decided after that, inside your building. Because supply is buffered in roof and ground tanks, water often stands for a day or more before use. Still water, heat and a little sediment are exactly what Legionella needs. The bacterium is common at low levels in fresh water. It is the building that lets it multiply.
Stage by stage: tank, riser, heater, outlet
1. The roof or ground tank. A dark tank on a sunlit roof heats up fast. Loose lids and unscreened vents let in dust, insects and birds, and sediment settles on the floor. Oversized tanks are a hidden problem too: if a 5,000 litre tank serves a café that uses 800 litres a day, the water at the bottom can be several days old.
2. Risers and ceiling voids. Cold pipes that share a duct with hot pipes, or run above kitchen extract, pick up heat on the way down. A tap in the far corner of the building can deliver "cold" water that is already in the growth range.
3. The water heater. Heaters set low to save power, or with sludge in the base, let bacteria survive. A return loop that does not circulate properly leaves lukewarm water in the far branches.
4. The outlets and equipment. This is where spray happens. Pre-rinse spray taps in the wash-up, staff showers, glasswashers, combi ovens and ice machines all release fine droplets or hold water at warm temperatures. Taps in storerooms, prayer-room ablution areas and closed sections can sit unused for days.
Refits make all of this worse. Food outlets in Kuwait City, Salmiya and Hawalli change layouts often, and each change can leave capped branches of still water behind the walls.
What temperatures to aim for
Kuwait does not have a single published Legionella code for food premises that we can point you to, so most operators work to international guidance. Which guidance depends on who wrote your assessment. A UK-trained assessor will usually follow the HSE's ACOP L8 and HSG274, and write the report to BS 8580-1:2019, the British Standard for Legionella risk assessments. Others work to ASHRAE Standard 188 from the United States, and Dubai has its own municipal guideline. The temperature targets are broadly the same. The WHO advises:
| Part of the system | Target |
|---|---|
| Water leaving the heater | 60°C or more |
| Hot water in circulation | Above 50°C |
| Cold water | Below 25°C, ideally below 20°C |
For the routine itself, many Gulf assessors borrow the checking schedule from the UK's HSG274 Part 2: sentinel tap temperatures monthly, little-used outlets flushed weekly, shower and spray heads descaled quarterly, and tanks inspected at least once a year.
Holding cold water under 20°C in August is often not possible here. When that is the case, do not just accept it. Shorten the time water sits: smaller or split tanks, more frequent flushing, better insulation, and treatment at the point of use. Where high hot-water temperatures cause a scald risk at hand basins, fit a thermostatic mixing valve close to the tap rather than turning the heater down.
Tank hygiene and the water tank filter question
Many operators ask whether a water tank filter will fix the problem. A sediment filter on the tank inlet or outlet is useful. It catches sand and scale that would otherwise settle and feed biofilm, and it protects valves and equipment. It does not kill bacteria, and it does not stop stored water from warming. Treat it as one part of good tank care:
- keep the tank sealed, with a fitted lid and screened vent and overflow
- shade or insulate roof tanks
- size storage to what the building actually uses
- inspect the inside regularly and have it cleaned and disinfected when sediment or growth is found
- change any inlet filter cartridges on schedule
Keep a record each time the tank is inspected or cleaned. If you run ice machines, a dedicated inlet filter there matters too. Our ice machine filtration guide explains why. For drinking water points, see our water dispenser maintenance tips for Kuwait.
Writing it down: the risk assessment
A Legionella risk assessment turns the stage-by-stage check above into a document. It should show a drawing or description of the system, the temperatures measured, the outlets and equipment that create spray, who could be exposed (customers, kitchen staff, cleaners, and more vulnerable people), and an action plan with names and dates.
Food establishments in Kuwait are regulated by the Public Authority for Food and Nutrition. Check its current requirements for your licence. Whatever the local rules, a written assessment and a monthly log are what shows an inspector, insurer or head office that the risk is under control. Link the checks to your food safety (HACCP) records so they get done on the same rota as fridge temperatures and cleaning.
Our maintenance plans can take over the equipment side of the log: filter changes, sanitising and servicing of ice machines, dispensers and treatment units.
Biocides: when temperature is not enough
Because Kuwait's stored water so often sits above 20°C, many sites add a biocide. The main ones described in HSG274 Part 2, with the levels it suggests at the outlet:
| Biocide | Target at outlets | What to know |
|---|---|---|
| Chlorine | 0.5 to 1.0 mg/l free chlorine | Slows new biofilm. Less able to clear biofilm already in the pipes |
| Chlorine dioxide | 0.1 to 0.5 mg/l | Penetrates biofilm well. Lost as gas from hot water |
| Copper and silver ions | Above 0.2 mg/l copper and 0.02 mg/l silver | Released by electrodes. Scale from hard water reduces output |
| Silver stabilised hydrogen peroxide | As set by the maker | Must be validated on your system |
A dosed tank or supply only stays safe if someone checks it. Inspect the dosing kit at least weekly and test the level at your sentinel taps every month. Ozone and UV are different again: they treat water where they are installed but leave nothing behind in the pipes.
UV disinfection as an extra layer
UV disinfection passes water over a UV-C lamp that stops bacteria from reproducing. It suits Kuwait sites well because it adds nothing to the water and needs little space. It treats only the water passing through it, though, and gives no protection to pipework further on. So it backs up good tank care and temperature control, it does not replace them.
The usual positions are straight after the storage tank, to treat the building supply, or at a single critical point such as an ice machine or a drinking water dispenser. See our SovSafe UV systems for whole-site units. Our guide to commercial UV water disinfection covers sizing and lamp changes.
Tell us your flow rate and what you want to protect, and we will size a unit. Request a Quote.
How Sovereign Water helps
We supply, install and maintain water treatment for Kuwait food and hospitality sites: sediment and carbon filtration, UV disinfection, and the ice, beverage and dispenser equipment that depends on clean water. We also carry out Legionella risk assessments for Kuwait premises, following the tank-to-tap check above and giving you a written report and action plan. From there we recommend treatment that suits your supply and your trading hours, and keep it serviced and recorded.
Frequently asked questions
Where does Legionella grow in a Kuwait building?
Mostly in stored and slow-moving water that has warmed up: roof tanks, cold pipes in hot voids, poorly circulating hot water loops, dead legs from refits, and taps that are rarely used.
What temperature should cold water be kept at?
The WHO says below 25°C, and ideally below 20°C. In Kuwait's summer that is hard, so reduce storage time, insulate pipes and tanks, and flush idle outlets often.
Does a water tank filter stop Legionella?
No. A sediment filter removes particles that feed biofilm and protects equipment, but it does not kill bacteria or keep water cool. Use it alongside tank care, temperature control and, where needed, UV.
How often should a water tank be inspected?
HSE guidance, which many Gulf assessors use, says at least once a year. In Kuwait's heat, or if sediment builds up quickly, your assessor may advise more often.
Who regulates food outlets in Kuwait?
The Public Authority for Food and Nutrition regulates food establishments. Check its current requirements for your premises and keep your water records with your food safety records.
Plan your next step
Send us a few details about your premises, how water is stored and the equipment you run, and we will suggest a sensible next step. Get in Touch.
Sources
- World Health Organization, Legionellosis fact sheet (growth range, transmission, hot and cold water targets, accessed 8 October 2026)
- Ministry of Electricity, Water and Renewable Energy, Kuwait, Statistical Monthly Book, June 2025 (PDF) (desalinated water production)
- UK Health and Safety Executive, HSG274 Part 2, Legionnaires' disease technical guidance (PDF) (checking frequencies and biocide target levels)
- Public Authority for Food and Nutrition, Kuwait
- British Standards Institution, BS 8580-1:2019 Water quality. Risk assessments for Legionella control. Code of practice
- ASHRAE, Standard 188, Legionellosis: Risk Management for Building Water Systems
