Landlord Legionella Risk Assessment: Everything You Need To Know

There are a number of ever-changing compliance regulations landlords have to keep on top of, from electrical regulations, gas safety, and EPC requirements to the new MTD for IT coming in 2026. But what’s the deal when it comes to water?

In this article, we take a close look at landlord responsibilities around water, the risks of Legionella, how to run a Legionella risk assessment, and what you need to do to keep your water and your tenants safe.

Legionella Risk Assessments: Summary

It is a legal requirement for landlords to carry out risk assessments on their properties to assess the potential risk of exposure to legionella. This risk assessment must consider the domestic hot and cold water systems, water tanks, water heaters, and the water temperature.

The requirement stems from the control of Substances Hazardous to Health Regulations 1989. Section 3 (2) of the Health and Safety at Work Act 1974 makes provision for the legislation to apply to landlords of both business and domestic premises. Landlords do not need to get a formal certificate and can carry this work out themselves if they are competent, or otherwise employ somebody else to do so.

Contents

• What Is Legionella?
• About Legionnaires' Disease
• Legionella: Legal Frameworks and Landlord Responsibilities
• What Does a Landlord Legionella Risk Assessment Involve?
• How Often Should Landlords Carry Out a Legionella Risk Assessment?
• Do You Need To Get a Professional Legionella Risk Assessment?
• How Can Landlords Minimise the Risks of Legionella?
• What Other Inspections and Assessments do Landlords Need to Carry Out?
• Final Words: Software And Managing Landlord Compliance

What is Legionella?

Legionellosis or Legionnaires’ disease is caused by ingesting common Legionella bacteria and is an infectious and sometimes fatal form of pneumonia. Legionella bacteria generally live in soil, compost, potting mix, and is commonly found in water systems (for example, spa pools, and hot water tanks). Legionella thrives between temperatures of 20°C to 45°C degrees.

Hot and cold water systems are an ideal environment for Legionella to grow in. The risk of contamination is particularly high in:

• Water tanks and systems in which water is stagnant and/or recirculated
• Water droplets or aerosols produced by whirlpool baths or showerheads
• Mist and spray dispersed into the air
• Rust, scale, sludge, and biofilm that “feed” the bacteria
• Properties that are left empty for a long period of time

The risk of Legionella is low in properties with combi boilers, as the system keeps the water moving – giving the bacteria little chance to develop.

However, homes with open water tanks (usually older buildings) have a substantially higher risk of Legionella, as the water is more likely to be left to stagnate.

About Legionnaires’ Disease?

Legionnaires’ disease can develop into a serious and even life-threatening illness. Common symptoms include:

• High temperature
• Coughing
• Shortness of breath
• Headaches
• Nausea

The symptoms of Legionnaires’ disease usually last between 2 to 10 days and can be treated with antibiotics. Some people are particularly vulnerable to the risks of Legionella, including older people, those with lung issues, and poor immune function.

Legionella: Legal Frameworks and Landlord Responsibilities

As a landlord, you have a legal duty to ensure your rental property is safe and free from health hazards for your tenants. This responsibility applies whether you rent out an entire property or a single room within your home.

Legionella Legal Frameworks

• Health and Safety at Work Act (HSWA): Section 3(2) of the HSWA establishes that landlords have a duty of care to protect their tenants' health and safety. Even though landlords are considered self-employed under Section 53 of the HSWA, they are required to manage their rental properties in a way that minimizes health and safety risks for tenants.
• Control of Substances Hazardous to Health Regulations (COSHH): COSHH outlines specific actions landlords must take to control risks from hazardous substances, including biological agents like Legionella bacteria. This involves assessing potential risks and implementing measures to reduce or eliminate them.
• Approved Code of Practice (L8): The Approved Code of Practice for controlling Legionella bacteria in water systems offers practical guidance on meeting the requirements of the HSWA and COSHH. This code is a key resource for landlords to understand their obligations and take appropriate action to safeguard tenants.

What Does This Mean for Landlords?

In practice, this means that you as the landlord are responsible for assessing risks, like Legionella in water systems, and taking necessary steps to control them. Whether through routine inspections, implementing safety measures, or keeping records.

Understanding these responsibilities is crucial for maintaining a safe and legally compliant rental property. So, while landlords are not legally required to pay for a professional legionella inspection, they are required to ensure routine legionella inspections are carried out by somebody (themselves or a professional) with a competent understanding legionella and the associated risks.

You can learn more on the Health and Safety Executive website here.

What Does a Landlord Legionella Risk Assessment Involve?

A Legionella risk assessment will generally cover all water systems in your rental property. The assessment itself will involve:

• Identifying potential hazards and the level of risk posed
• Identifying who is at risk
• Testing the water system for Legionella*
• Putting adequate control measures in place to minimise the risk
• Recording the findings of the assessment
• Reviewing the assessment as needed

*Testing or sampling water for Legionella bacteria is not a legal requirement for landlords but is typically part of a Legionella risk assessment carried out by a professional.

A Legionella risk assessment should be carried out by someone with a competent understanding of the hazard of Legionella.

How Often Should Landlords Carry Out a Legionella Risk Assessment?

The regularity of the Legionella risk assessment is really down to the property. or properties with water systems that are more likely to pose a Legionella risk, it is recommended that a risk assessment is carried out once every two years – or before a new tenancy begins. It’s also a good idea to perform a risk assessment if there are significant changes to the property’s water systems.

Do You Need To Get a Professional Legionella Risk Assessment?

As mentioned above, while you as the landlord are responsible for ensuring the property is safe and habitable, meaning routine legionella risk assessment must be carried out by someone with a competent understanding of legionella and the hazards involved, you are not legally required to pay for a professional legionella risk assessment to be done. The inspection can be done by you or someone you know. However, if you are uncertain about how to conduct an assessment, getting a pro involved is an excellent way to ensure your water supply is safe.

There is also the element of time an assessment will take, so depending on the size of your property outsourcing the work might provide significant time benefits.

A professional Legionella risk assessment should inspect a variety of aspects including:

• A digital temperature reading of every hot and cold tap on the property and reading of outlet pipes from water tanks.
• Visually inspect every tap and shower head,
• Report on redundant pipework, flexible hoses, and outdoor hoses
• Access and report on any water tanks in the loft.
• If the property has a garden with an exterior tap, it must be tested for limescale.

As such, a one-bed flat with a combi-boiler wouldn’t have many of the elements needed to inspect and may take as little as twenty minutes. On the other hand, a larger property with a garden, multiple bathrooms, and a hot and cold tank would take significantly longer, an hour or more.

How Can Landlords Minimise the Risks of Legionella?

There are a variety of things that can be done and are recommended by the Health and Safety Executive to help reduce the risk of Legionella disease in buy-to-let properties. These measures include:

• Flushing out the water system before the property is let (and once a week during void periods).
• Ensuring systems and tanks are soundly and tightly fit to avoid debris getting in.
• Setting control parameters, such as setting the temperature of the hot water cylinder to ensure hot water is stored at 60°C.
• Removing any faulty or redundant pipework.

The above controls are the landlord’s responsibility, but tenants should be notified of any measures in place and be advised to:

• Notify the landlord if there are problems with the water system (such as the hot water not working).
• Not adjust set temperature parameters.
• Regularly clean and disinfect showerheads.

What Other Inspections and Assessments do Landlords Need to Carry Out?

Legionella inspections are just one of the important assessments that you as a landlord are responsible for. The following inspections and assessments are required by law and compliance will help ensure you are providing a safe and habitable residence and are essential if you want to avoid legal liability issues should disputes arise.

As a landlord, you must:

• Carry out an annual gas safety inspection and issue your tenant a copy of the gas safety certificate.
• Conduct an electrical safety inspection every 5 years.
• Carry out an energy performance assessment to ensure your property has an energy performance rating of ‘E’ or above and issue a copy of your EPC to your tenant.
• Check all smoke alarms and carbon monoxide detectors are working on the first day of the tenancy.
• Give your tenant a copy of the government’s “How to Rent” guide at the start of their tenancy.

If you fail to arrange your required inspections or fail to give your tenants the correct documents, you could be subject to hefty fines and may invalidate your right to issue a Section 21 notice to your tenant.

For more information read our guide to Landlord Responsibilities and Legal Obligations.

Final Words: Software And Managing Landlord Compliance

Managing compliance as a landlord can feel overwhelming, with ever-changing regulations and a long list of essential inspections and assessments to keep track of. Landlord Studio simplifies this process, providing the tools you need to stay on top of your legal obligations. With property maintenance management tools and personal reminder system for tasks like Legionella risk assessments, gas and electrical inspections, and EPC renewals, you’ll never miss a deadline.

The platform’s secure document storage ensures all compliance certificates and reports are easily accessible, while tenant communication features let you share important updates and requirements with your tenants effortlessly. Additionally, Landlord Studio offers robust rental accounting tools to help you manage your property finances, from scanning receipts and streamlining income and expense tracking with features like bank feeds to a range of customisable financial reports.

By streamlining compliance and providing an all-in-one solution for property management, Landlord Studio allows you to focus on what matters most: maintaining safe, well-managed properties and fostering positive tenant relationships. Don’t let compliance challenges weigh you down—let Landlord Studio help you stay organised and stress-free. Create your free Landlord Studio account today.

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