We all want clean and safe water when we turn on the tap. However, keeping water supply systems safe can be daunting. Underground water infrastructure can become outdated, and newer versions featuring lower flow rates can keep water in pipes for extended periods. Both external and internal factors can lead to Legionella growth in building water systems. Opportunistic premise plumbing pathogens (OPPS) are the main cause of waterborne disease in the UK. Legionella pneumonia, a type of OPPP, can grow in water supply systems and cause Legionnaire’s disease.

Legionella are naturally occurring bacteria present in natural aquatic environments like lakes, rivers and water reservoirs. They are not visible to the naked eye.

Affordable landlord Legionella risk assessment services.

In low levels, the bacteria does not lead to disease. Legionella can however multiply to dangerous levels and potentially cause Legionellosis under certain conditions in artificial water systems like hot and cold-water systems, and spa pools. The bacteria grows in water systems at temperatures of 20-50°C and an optimum pH of 5.0-8.5.

People with weakened immune systems and underlying illness are most susceptible to Legionella infections. Make no mistake; even if you’re healthy, you or your tenants are at risk of contracting the disease as well.

Key elements that promote the development of Legionella bacteria in a commercial building water supply system include:

  • Cross-connections between potable and non-potable water

  • Lukewarm water temperatures

  • Excessive water age

  • Inadequate corrosion control

  • Insufficient disinfectant

  • Biofilm

There is no known safe level of Legionella in commercial building water systems. Cases of Legionnaire’s disease, a severe form of pneumonia, have been reported even in water systems with very low levels of the bacteria. Studies show that the bacteria grows best in large, complex water systems that are not well-maintained.

Reliable and affordable Legionella consultancy services

According to the UK Regulations Section 3(2) of the Health and Safety at Work Act 1974 (HSWA), if you rent out your commercial property, you have a legal responsibility to see that the health and safety of your tenants are well taken care of. You need to review your landlord Legionella risk assessments every 2 years or under the following circumstances:

  • Availability of new guidance

  • Substantial changes to the water system

  • Changes to building use

If an outbreak of legionnaire’s disease occurs, the authorities will ask for evidence of risk assessment, monitoring and maintenance. Without compliance documents in place, you will be penalised by the Health and Safety Executive (HSE). Failure to meet with the obligatory landlord Legionella risk assessment compliance requirements may lead to prosecution and litigation

Unless you possess enough knowledge within your establishment to perform Legionella risk assessment and to create and implement a viable scheme of control and monitor its efficacy, you better leave your risk assessments to the experts.

Lucky for you, MBMS can help you with your landlord Legionella risk assessment, treatment and compliance. We are proud to say we are always the first port of call for both domestic and commercial Legionella clients right across the UK.

Trusted Legionella consultancy services throughout the UK.

Our Legionella consultancy services programme will monitor water quality parameters in your commercial building in full, to ensure that your building water systems are operating in a manner to reduce hazardous conditions that could cause Legionella and other waterborne pathogens to thrive. Assessment includes scrutinising temperature and disinfectant levels. We will then compile a full report with recommendations. If we find that a control limit is not being met, we will take the appropriate corrective actions to return the conditions to within a safe range.

Here are some of the Legionella consultancy services we provide:

  • Legionella screening

  • Installing and maintaining drift eliminators to minimise dissemination of aerosols from cooling towers

  • Mist-elimination technologies

  • Scheduled cleaning, disinfection and maintenance of cooling towers

  • Regular addition of biocides

  • Minimising water stagnation by flushing unused taps in commercial buildings

Whatever your project, we are ready to provide a tailored, seamless and first-class service that exceeds your landlords Legionella risk assessment requirements on every level. If you are interested to learn more about how we can work with you, please do not hesitate to Get In Touch!

Did you know that we also offer a wide range of shop fitting services and provide highly trained Shop Fitting Contractors to deliver a top quality solution for your next project.


Unit 5, Baker Business Park
Sellwood court, Sleaford, Lincs, NG34 8YX