Legionella Testing & Tank Cleaning

Mawdsleys Pump Services specialise in the provision of legionella testing, tank cleaning and chlorination, disinfection and system maintenance of hot and cold water systems. Our service ensures that individuals and companies fulfil their Health and Safety obligations and remain compliant with the ACOP L8 approved code of practice.

We work with a wide range of clients in industrial and commercial premises, from building managers and facilities management companies, to portfolio landlords and housing associations and can help with all aspects of testing and cleaning including a full aftercare and maintenance service to prevent issues in future.

All our engineers are CSCS approved and competent in confined space entry, with all works undertaken in compliance with ACOP L8 following procedures outlined in BS6700.

If you’ve had a legionella risk assessment carried out and want to ensure compliance, give one of our team a call today on 0117 954 8030 or fill out a contact form and we’ll get back to you.

Tank Cleaning, Chlorination and Disinfection

At Mawdsleys Pump Services, we provide a complete chlorination and cleaning service for all hot and cold water systems. Chlorination is the industry standard process for sterilising drinking water and ensuring it’s fit for human consumption.

As well as removing any bacteria that may already be present, regular tank cleaning prevents any sludging or sediment build up which can allow legionella bacteria to grow.

All of our works are carried to ACOP L8 standards and we use specialist aqua vac technology to achieve best results. Following the tank clean, we provide a full report with any recommendations as a result of the test and can assist with any aftercare or maintenance that may be required.

Water tank before and after chlorination cleaning service

Recommended Frequencies for Tank Chlorination

Whilst there is no set frequency for the chlorination, cleaning and disinfection of tanks – those responsible for the water system are also responsible for ensuring it is safe and fit for purpose.  

Mawdsleys Pumps recommends an annual water test to ensure there are no harmful microbes present and a more frequent visual inspection of the water tanks to check for any visible issues within the tank such as the presence of corrosion or growth of mould.

Additionally, hot and cold water systems should be chlorinated, cleaned, flushed and disinfected in the following situations.

  • Completion of a new water installation or refurbishment of a hot and cold water system.
  • Installation of new components.
  • Where the hot and cold water is not used for a prolonged period.
  • On a routine inspection of the water storage tanks, where there is evidence of significant contamination or stagnation.
  • If the system or part of it has been substantially altered or entered for maintenance purposes that may introduce contamination.
  • Following water sampling results that indicate evidence of microbial contamination of the water system.
  • During, or following an outbreak or suspected outbreak of legionella is linked to the system.
  • Animal contamination.
  • The presence of biofilm, flora growth, or corrosion.

Legionella Testing

If you have had a legionella risk assessment undertaken and have been advised that there is a risk of legionella in your system, we can provide fast and accurate results for all kinds of water systems. Samples taken are sent to an independent UKAS accredited laboratory for testing and can be ready in as little as a week.

Following the test, we can provide you with the analysis as well as a report with any remedial works required. We can handle all aftercare work to ensure your water system is compliant including bespoke maintenance contracts to reduce the risk of any problems arising in the future.

petri dish with bacteria growth

Bespoke Booster Pump Maintenance Contracts

Unlike other suppliers, we can provide a complete booster pump maintenance service including testing, cleaning, chlorination and aftercare to ensure compliance, prevent outbreaks within the system and reduce the risk of an unexpected breakdown.

Clients who benefit from this service include landlords, building managers and facilities management companies who are responsible for a number of units. For more information, call us today on 0117 954 8030 or fill out a contact form and we’ll get back to you.

booster pump installation Mawdsleys pump services


Why Is Chlorine Used?

Chlorine is the industry standard as it effectively kills any bacteria and viruses that may be in the water; ensuring it is fit for human consumption upon delivery to the building’s residents.

Where Might Legionella Be Present?

All man made hot and cold water systems provide an adequate environment for legionella to grow, but there are factors which can impact how well it thrives:

  • The presence of rust, sludge, scale or biofilm can promote growth.
  • If the water is stored rather than recirculated.
  • The temperature, legionella thrives between 20-45c but will die at 60c.

Additionally, the water temperature and whether the water is stored or recirculated can impact how well the bacteria grows. Legionella can thrive in all water systems of all sizes, but particular attention should be paid to:

  • Cooling towers
  • Hot and cold water systems
  • Evaporative condensers
  • Spas and swimming pools
  • Humidification plants

Who Is Responsible for Controlling the Risk of Legionella?

As an employer, or person in control of premises, you must appoint someone competent to help you meet your health and safety duties and to take responsibility for controlling any identified risk from exposure to legionella bacteria.

A competent person, often known as the responsible person, is someone with sufficient authority, competence, necessary skills, knowledge of the system, and experience.

Under the Health and Safety at Work etc Act 1974, the responsible person must understand how to:

  • Identify and assess sources of risk.
  • Manage any risks.
  • Prevent or control any risks.
  • Keep and maintain the correct records.

The BSI British Standard BS7592:2008 Sampling for Legionella Bacteria in water systems is the code of practice that needs to be adhered to by law.  

Contact Our Expert Team

At Mawdsleys Pump Services, we have fully trained engineers who can undertake all aspects of water hygiene in water systems. We also offer a 24-hour emergency call out service in the event of a breakdown and can carry out repairs and maintenance on cold water tanks including replacement of essential pipework.

If you need your water tanks cleaned, or have just had a legionella risk assessment carried out and need your system testing, call us now on 0117 954 8030 or fill out a contact form and we’ll get back to you.