Do I need to register a cooling tower?
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Key points
- Yes. The Notification of Cooling Towers and Evaporative Condensers Regulations 1992 require you to notify the local authority, in writing, for any cooling tower or evaporative condenser.
- The duty is ongoing: notify changes to the details and notify again when the device ceases to operate.
- Notification is a register for outbreak investigation, not a licence, an approval, or any judgement on how well the tower is run.
- Plant that rejects heat without evaporating water is not notifiable: dry coolers and standard air-conditioning units are out of scope.
- Registration sits on top of the ACOP L8 duties; it does not replace the risk assessment, written scheme, or monitoring.
Yes. If you control premises with a cooling tower or an evaporative condenser, you must notify the local authority for the area where the premises are situated, in writing, under the Notification of Cooling Towers and Evaporative Condensers Regulations 1992. The duty was made under the Health and Safety at Work etc. Act 1974 and it is ongoing: you notify when the device is installed, you notify changes to the details, and you notify again when it is removed or stops operating. It is one of the few legionella-related duties that is a simple, unqualified requirement with no risk-assessment judgement attached.
What the 1992 Regulations actually require
The regulations are short and their content is narrower than people assume. They require the person in control of the premises to tell the local authority, in writing, that notifiable plant is on the premises, and to keep that notification current. Most councils' environmental health departments handle the register and many publish a form for it. There is no fee structure set by the regulations, no inspection triggered by the notification itself, and no approval to wait for. You are adding your tower to a list, not applying for permission.
The duty has three moments: installation or takeover, when the authority is first told; change, when the details notified are no longer accurate; and cessation, when the tower is decommissioned or removed. The third is the one most often missed, and it matters because an out-of-date register sends outbreak investigators to towers that no longer exist while the real ones go unchecked.
Why the register exists
Cooling towers are the highest-consequence legionella system in common use: they hold warm water, generate a large plume of drift and aerosol, and can seed a wide area downwind. When cases of Legionnaires' disease appear, the first investigative step is to identify every cooling tower and evaporative condenser in the surrounding area and inspect them fast. The 1992 register is what makes that search possible. That is the whole purpose of the notification, and it explains the design of the duty: it is not about your tower being safe, it is about your tower being findable.
Notification puts your cooling tower on the local authority's register so outbreak investigators can find it fast. It is not a licence, not an approval, and not evidence of control. The control duties sit separately under ACOP L8 and HSG274 Part 1.
Two consequences follow from that purpose. First, notifying says nothing about compliance. A registered tower can be dangerously run and an unregistered one well managed; the register records existence, not quality. Second, notification does not discharge or dilute any other duty. The risk assessment, written scheme of control, monitoring, and record-keeping under ACOP L8 and HSG274 Part 1 apply in full, as set out in our guide to cooling tower legionella control.
What is in scope and what is not
The test is evaporation. A cooling tower rejects heat by evaporating water into an airstream; an evaporative condenser does the same for a refrigeration or air-conditioning circuit. Both are notifiable, wherever they sit: roof, yard, or plant room. Plant that rejects heat without evaporating water is outside the regulations: dry air blast coolers, ordinary refrigerative air-conditioning condensers, and split-system air-conditioning units are not notifiable, though they may still deserve a place in the water risk assessment if they involve water in any other way. When the classification is genuinely unclear, ask the local authority's environmental health team; the cost of asking is trivial next to the cost of an unregistered tower surfacing during an outbreak investigation.
How notification fits the rest of the duty
Think of the cooling tower duties as a stack. At the base is the legionella risk assessment of the whole system, identifying the tower and its risks. Above it sits the written scheme of control: the water treatment programme, dip slides and sampling where required, drift eliminator and fan maintenance, bleed and make-up checks, and the monitoring schedule that records them all, kept for at least five years. Notification is the thin layer on top: a letter or form to the council that takes an afternoon, renewed when anything changes. It is the easiest duty in the stack and the one inspectors can check without visiting, which is why an unregistered tower is such a reliable prompt for a harder look at everything underneath.
If you have just taken over premises and are not sure what was notified, contact the local authority and ask what their register holds for the address, then reconcile it with the plant you actually have. Record what you find and what you sent, as you would any other control. The risk assessment builder gives you the structure for the underlying assessment record, though with a cooling tower the assessor is usually a specialist and the duty holder's job is to own and keep that record. The register entry records the tower's existence; the assessment and the log record its management; neither certifies the other.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Frequently asked questions
Do cooling towers need to be registered in the UK?
Yes. The Notification of Cooling Towers and Evaporative Condensers Regulations 1992 require the person in control of premises to notify the local authority, in writing, that the premises contain a cooling tower or evaporative condenser. The duty continues after the first notification: you must also notify the local authority if the details change and when the device ceases to operate. This is separate from, and additional to, the risk assessment and control duties under ACOP L8 and HSG274.
Who do you notify about a cooling tower?
The local authority for the area where the premises are situated, usually the environmental health department. The notification is in writing and identifies the premises and the notifiable device on them. Many councils provide a form for it. If you take over premises with a cooling tower, check whether the notification is current, and if you remove or decommission the device, tell the same authority so the register can be updated.
What counts as a notifiable cooling tower?
A cooling tower or an evaporative condenser: equipment that rejects heat by evaporating water, producing the warm, wet, aerosol-generating environment that makes these systems a legionella risk. The regulations do not bite on plant that contains no water to evaporate, so dry air blast coolers and ordinary refrigerative air-conditioning condensers are not notifiable. If the equipment evaporates water to reject heat, treat it as notifiable.
Does an air conditioning unit need to be notified?
Generally no, if it is a standard refrigerative unit: split systems and packaged air-conditioning units that reject heat to air without evaporating water are not cooling towers or evaporative condensers and are not notifiable. An evaporative condenser serving a refrigeration or air-conditioning system is different, because it does evaporate water, and that brings it within the regulations. The test is whether heat rejection involves evaporating water, not what the plant is used for.
What happens if you do not register a cooling tower?
Failing to notify is an offence under the 1992 Regulations, made under the Health and Safety at Work etc. Act 1974. The practical consequence matters more than the penalty: the register exists so that, when Legionnaires' disease cases appear, investigators can quickly find and inspect every cooling tower in the area. An unregistered tower defeats that search at exactly the moment speed matters, and it signals to an inspector that the wider L8 duties may have been missed too.
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