Straightforward Landlord Legionella Duties Explained

How to Know Exactly What You’re Legally Responsible For (No More Guesswork)

Understand the UK Law: What the HSE Requires from Every Landlord

Let’s cut through the noise. As a landlord in the UK, you have a legal duty to keep your tenants safe from health hazards — and that includes the risk of legionella bacteria in water systems.

Yes, it’s real. Yes, it applies to you. Even if you only rent out a single flat.

The key piece of legislation to focus on is the Health and Safety at Work etc. Act 1974, along with the Control of Substances Hazardous to Health Regulations (COSHH). But more specifically, the Health and Safety Executive (HSE) offers guidance under its Approved Code of Practice (ACoP) L8. This is where the meat is.

Under these rules, you’re legally responsible for ensuring that the water systems in your rental properties do not pose a risk of exposure to legionella. That means you must identify potential risks, assess them, and take control measures if needed.

The good news? A formal certificate isn’t required. You don’t need to pay for lab tests unless there’s a specific reason. What matters is the process — that you’ve taken “reasonably practicable” steps to identify and control the risk.

That includes carrying out a legionella risk assessment on your rental property and keeping a record of it. It also means making sure cold water stays cold, hot water stays hot, and that water doesn’t sit still in pipes for weeks.

This isn’t bureaucracy for bureaucracy’s sake — it’s about preventing a potentially deadly form of pneumonia that thrives in stagnant water between 20°C and 45°C.

Whether you’re managing a single buy-to-let or a portfolio of HMOs, your legal duties under UK law do not change. The size of your property may affect how you carry out your checks, but your responsibilities stay the same.

If you’re not meeting them, and someone gets sick, you could face legal action.

So, what exactly do you have to do? Keep reading.

Landlord Legionella Responsibilities vs. Letting Agent Duties – Who Does What?

Here’s where the wires often get crossed. You may be thinking, “But my letting agent sorts all that, don’t they?”

Maybe. But maybe not.

Legally, the responsibility to carry out a legionella risk assessment — and to act on it — lies with the duty holder. That’s usually you, the landlord, unless you’ve clearly delegated the duty to a managing agent in your contract.

And even then, you’re not off the hook entirely. You must ensure that whoever you assign the duty to is competent and actually doing it.

Letting agents might offer legionella risk assessments as part of a management package. Some do it well, others treat it as a tick-box exercise. You need to know exactly what’s being done, when, and by whom.

Here’s a smart move: ask your letting agent to provide a copy of the most recent legionella risk assessment. Look at the date. Is it recent? Does it cover all relevant outlets (showers, taps, water tanks)? Does it include control measures?

If the answer is no, or if they go quiet when you ask, assume it hasn’t been done. And that means the legal duty is still yours.

One more thing — if your tenant arranges their own water supply maintenance (say, in shared accommodation or student housing), you still hold the legal duty unless you have clear documentation showing otherwise.

Don’t assume. Confirm.

What “Reasonably Practicable” Means for Landlords (and How to Stay Compliant)

Let’s decode the phrase that trips up most landlords: “reasonably practicable.”

This is the legal standard the HSE uses to judge whether you’ve done enough to control legionella risk. It’s not about achieving zero risk — it’s about weighing the time, cost and effort of a safety measure against the level of risk.

Here’s how that plays out in real life:

• You’re not expected to rip out a bathroom to replace a tap.
• You are expected to fix a broken thermostat that’s keeping your hot water at 35°C.
• You’re not required to install a UV filtration system.
• You are required to flush unused outlets between tenancies.

In most domestic rental properties, the level of legionella risk is low. Especially in modern buildings with combi boilers and no cold water tanks. But that doesn’t mean you do nothing.

What’s “reasonably practicable” is:

• Doing a legionella risk assessment whenever a new tenancy starts
• Identifying high-risk areas like rarely used showers or garden taps
• Keeping hot water above 50°C and cold water below 20°C
• Notifying tenants to run water outlets weekly if they’re not used often

This isn’t about expensive interventions. It’s about good management.

The HSE won’t expect you to be a microbiologist — just to show that you’ve taken sensible, proportionate actions.

Want a simple way to stay compliant? Document what you check. Keep water temperatures within safe ranges. Flush outlets. Educate your tenants.

That’s it. That’s “reasonably practicable” in action.

If you’re ever challenged, you’ll have the paperwork and the proof to back it up.

And that’s your legal safety net.

How to Take Action Without Overcomplicating It

When and How to Carry Out a Legionella Risk Assessment on Your Rental Property

You don’t need a PhD in microbiology to meet your landlord legionella responsibilities. But you do need a clear process. The law in the UK doesn’t demand a written legionella risk assessment for every property—but it does require you to assess the risk. And if you’re a landlord, that duty falls on your shoulders.

Start simple. Ask: does the property have hot and cold water systems? Does it have a water tank or a combi boiler? Are there any outlets that don’t get used often, like a rarely-used shower in a spare ensuite?

These are the areas where legionella bacteria can thrive. Your job is to identify these risks and take action where needed.

The ideal time to carry out a legionella risk assessment is before a new tenant moves in. That way, you’re starting with a clean slate. If tenants are already in place, no problem. You can still carry out the assessment with minimal disruption.

Walk through the property. Check for:

• Stagnant water sources
• Dead legs (redundant pipework where water doesn’t flow)
• Water tanks with no lids
• Showers that haven’t been used in weeks

If any of these exist, you’ve got potential risks. Your next step is to fix or manage them.

You don’t need to overthink this. If the system is simple—combi boiler, no water tank, all taps used regularly—the risk is likely low. That doesn’t mean you skip the assessment. It means you document that the risk is low and explain why.

If you manage multiple properties, build a checklist that you can repeat for each one. The goal is consistency. And yes, it’s worth keeping a record even if it’s not legally required—it shows you’ve done your job if ever questioned.

What to Include in a Risk Assessment (The Must-Have Elements Landlords Often Miss)

Most landlords think a legionella risk assessment means flushing a few taps and calling it a day. That’s a mistake. To be compliant—and to truly protect your tenants—you need to go deeper.

Start with a basic property profile:

• Address
• Type of hot water system (combi boiler, immersion heater, etc.)
• Cold water sources (mains or tank-fed)
• Number of bathrooms and kitchens
• Presence of any tanks, especially loft tanks

Then, focus on the actual risks:

• Are there water outlets that are rarely used?
• Are there any areas of pipework with little to no flow?
• Is the hot water hot enough? (Legionella dies at 60°C)
• Is the cold water cold enough? (Below 20°C is ideal)
• Are there any visible signs of scale, rust, or sediment in taps or showerheads?

You also want to assess control measures already in place:

• Are taps and showers cleaned regularly?
• Are showerheads descaled every quarter?
• Are any tenants vulnerable (elderly, immunocompromised)?

Most landlords miss the importance of outlet temperature checks. This is crucial. Do a simple test—run the hot tap for a minute and use a thermometer to check the temperature. It should hit 50°C or higher within a minute. If not, your water heater might not be doing its job.

Also, don’t overlook tenant habits. If a tenant goes away for 2 weeks and no one uses the shower, that stagnant water creates a risk. You can include guidance in your welcome pack to ask tenants to run all taps and showers for a few minutes after long absences.

Finally, document it all. Even if the risk is low, write down what you checked, what you found, and what actions (if any) you took. A simple Word doc saved in your property folder works fine. If you ever have to prove you’ve done your due diligence, that paper trail could save you a lot of headaches.

The DIY Route vs. Hiring a Professional – Which Is Right for Your Property Size and Type?

Let’s be honest—not every landlord wants to climb into a loft to inspect a cold water tank. And that’s okay. The question is: when should you do it yourself, and when should you bring in a pro?

Here’s the basic rule:

• Simple systems = you can DIY
• Complex systems = get a qualified assessor

If your rental property has:

• A combi boiler
• No water tank
• Regularly used outlets

Then you can carry out the legionella risk assessment yourself, using a checklist and thermometer. Make sure you understand the basics of legionella control measures, and you’ll be compliant.

But if your property has:

• Large water tanks
• Multiple bathrooms
• Unused or rarely-used outlets
• Elderly or medically vulnerable tenants
• HMO or shared housing setup

Then it’s smart to bring in a professional. They’ll spot risks you might miss, and they’ll give you a written report that doubles as proof of compliance.

Costs vary, but most professional legionella risk assessments for standard rental properties fall in the £295–£495 range. For HMOs or large properties, expect to pay more.

Another benefit of using a pro: peace of mind. You’re not second-guessing whether your notes are enough. You’re not worrying about whether you missed something that could become a legal issue later.

If you manage several properties, you can even negotiate a discounted rate for multiple assessments.

One thing to avoid: paying for unnecessary legionella testing. The Health and Safety Executive (HSE) doesn’t require routine water sampling for domestic rentals. Testing is only needed if there’s a specific concern—like a vulnerable tenant has become ill or you’ve identified high-risk conditions. Don’t let a company upsell you into expensive lab work you don’t need.

If you decide to go the DIY route, use a reliable legionella risk assessment template tailored for landlords. These help you cover all the bases and ensure nothing slips through the cracks.

Whatever route you choose, remember that legionella compliance in the UK is about being “reasonably practicable.” That means taking action proportionate to the risk. If you show you’ve thought it through, documented it, and put simple control measures in place, you’re on solid ground.

How to Build a Legionella Compliance Routine That Practically Runs Itself

How Often to Review Your Risk Assessment (Avoid Red Flags with a Simple Schedule)

Let’s talk about what most landlords either forget or procrastinate on until it becomes a problem: reviewing your legionella risk assessment. You don’t need to do this every week or even every month—but if you want to stay compliant and avoid the headache of surprise issues from the Health and Safety Executive (HSE), you need to have a simple, repeatable routine.

The keyword here is “reasonable.” The HSE doesn’t give you a rigid timeline. Instead, it expects you to review your legionella risk assessment “regularly”—especially when things change. So what does that mean in the real world?

Here’s the practical version:

– Review your legionella risk assessment every 2 years as a baseline.

– But if there’s a change to the water system, new tenants move in, or the property sits empty for a while, review it sooner.

Think of it like an MOT for your property’s water system. You wouldn’t ignore your car for two years if it started making weird noises. The same logic applies here. If you replace a boiler, install a new shower, or renovate the bathroom, it’s time to reassess. If a tenant reports low hot water temperatures, that’s another red flag. Don’t wait.

The 2-year check-in is your safety net. Put it in your calendar. Block out 30 minutes to review your notes, inspect the system (or call in your professional), and update your records. That simple habit will tick a major compliance box and keep you off the HSE radar.

And if you manage multiple properties? Create a spreadsheet or use a property management tool that reminds you when each risk assessment is due. Automation is your friend here. One less thing to occupy your mental shelf space.

Staying on top of this doesn’t just keep you compliant—it keeps your tenants safer. Legionella bacteria love ignorance and stagnation. A regular review kills both.

Record-Keeping for Landlords: What to Log, How Long to Keep It, and Why It Matters

Here’s where most landlords drop the ball—not because it’s hard, but because it’s not urgent… until it is. Good record-keeping is the invisible backbone of your legionella compliance. It’s your proof of due diligence. If the HSE ever asks, your records show that you’re not just guessing—you’re operating responsibly.

First, the basics. What should you record?

• The date the legionella risk assessment was carried out
• Who completed it (you or a professional)
• The findings: any risks identified and what you did about them
• Dates of any follow-up actions or reviews
• Notes on tenant communications related to legionella

If you’re using a legionella risk assessment template, it’ll guide you through most of this. But here’s the key: don’t just file it and forget it. Update your records whenever something changes. Installing a new combi boiler? Note it. Replacing a mixer tap? Update the file.

How long should you keep these records? At least five years. That’s a good rule of thumb. Even though it’s not a legal requirement to keep them for that long, it shows a consistent pattern of compliance—and that matters if anything ever goes wrong.

Store your records digitally if you can. Scan paper assessments, back them up in the cloud, and keep a copy linked to your property management software. This makes it easy to pull up the info at a moment’s notice—whether for a letting agent, a new tenant, or an HSE inspector.

And if you’re working with a letting agent, make sure you’ve agreed on who’s responsible for keeping and updating the records. Don’t assume they’re doing it. Ask to see the files. Check dates. Make sure your compliance isn’t hanging on blind trust.

Bottom line: your legionella records are your insurance policy. When you’ve got them sorted, you sleep better—and you protect your business.

Tenant Communication: What You Must Tell Them and How to Stay Covered Legally

Let’s get real for a second—if something goes wrong with legionella and a tenant ends up sick, the first thing people look at is who knew what and when. That’s why clear, documented communication with your tenants is non-negotiable.

Here’s what you need to tell them:

• What legionella is and why it matters
• What simple steps they can take to reduce risk (e.g. flushing unused taps)
• What you’ve done to ensure the system is safe
• Who to contact if they notice issues like low hot water temps or disused outlets

You don’t need to scare them. This isn’t about fear. It’s about transparency. A simple info sheet or a short paragraph in the welcome pack will do the job. Highlight things like:

– Run all taps and showers for a couple of minutes if they’ve been unused for a week or more

– Let you know immediately if hot water isn’t heating properly

– Report any signs of limescale or poor water flow

You’re not legally required to provide tenants with a copy of the legionella risk assessment. But you are expected to inform them of the findings if there’s a risk. So even if everything checks out, a short email or letter saying, “We’ve completed a risk assessment—no significant issues were found, and the water system is safe,” goes a long way.

Make it part of your move-in pack. Then, each time you review your risk assessment, send a brief update to the tenant. This keeps them in the loop, shows you’re on the ball, and builds trust.

And don’t forget to log these communications. Save the email. Screenshot the WhatsApp message. Keep a note in your records. If you ever need to prove you’ve kept tenants informed, you’ll have the receipts.

Here’s a power tip: use pre-written templates. Create a standard legionella info sheet and a boilerplate email for updates. Then personalise them slightly for each property. This saves you time and ensures you don’t miss essential info.

Remember, tenant communication isn’t just about compliance—it’s about protection. If they know what to do and who to contact, they’re less likely to ignore problems. And you’re less likely to deal with costly issues down the line.

Stay fully compliant with your legal duties around Legionella by arranging a professional risk assessment. Learn more about our Legionella Risk Assessments and see how they help protect your staff, customers, and business from hidden risks. When you’re ready, you can get your tailored quote here and take the first step towards peace of mind.