Water Tank Cleaning

Water-borne pathogens can easily grow and multiply within poorly maintained and neglected water tanks, giving rise to hospital acquired
infections and increasing risk of cross-contamination. Therefore, keeping water tanks clean is an extremely vital part of water hygiene and minimising water contamination. Also, it is extremely important that regular tests are taken to detect any harmful microorganisms within the hospital water tanks to ensure no contamination occurs. Water tank cleaning is usually done through chlorination and use of thermal disinfection with high temperature water.

The Risk of Infection

Bacterial infections present a significant problem – contaminated water tanks can give rise to nosocomial infections as these reservoirs serve as the perfect breeding ground of water-borne pathogens such as Legionella, Escherichia coli, and Pseudomonas aeruginosa, that can ultimately grow in large populations known as biofilms which can be very difficult to remove. These biofilms are composed of highly infectious agents known as spores that can eventually travel from water tanks into the water distribution systems and further contaminate other other parts of the system and environment, ultimately increasing the risk of infection as a result of coming in contact with contaminated water droplets. Many hospitals and clinics have a persistent problem with Pseudomonas and other water-borne pathogens, giving rise to harmful infections such as pneumonia, blood poisoning and urinary infections.

The Most Susceptible

Immunocompromised, the elderly and patients with chronic and respiratory diseases are among the most vulnerable to develop disease as a result of encountering contaminated water-droplets. However, that doesn’t mean healthy individuals such as the staff and visitors are at less risk. Contaminated water-droplets can affect everyone, especially maintenance personnel that work closely to water tanks. Asymptomatic carriers can still transmit the disease and increase the risk of cross-contamination as soon as they leave the contaminated area.

Talk to us about your cleaning requirements

Did you know?

Leigonella bacteria multiply where temperatures are between 20-45°C and nutrients are available¹.

How Inivos Can Help

Our water tank cleaning service can be delivered as an on-call service, emergency call out, specific project or as a scheduled managed service contract. Our work is carried out following the legislation laid down by the Health and Safety Executive.

This enables us to reduce the risk of a patient acquiring and infection whilst in hospital, by reducing the number of reservoirs available for dangerous pathogens to multiply in.

Our water tank cleaning services can be combined with our other services focused on the water vector of transmission to create an effective strategy, ensuring a consistent supply of clean, safe water.

Our Service

Alongside water tank cleaning, we can also provide our customers with water treatment solutions and microbiological testing and sampling to ensure no contamination is present within the water system. Hospitals can benefit from our water cleaning services in decontaminating potential reservoirs of different water outlets as well as testing for potential pathogens that might be present in the water systems. Our trained technicians wear personal protective equipment throughout all the cleaning and disinfection procedures.

Pre-Risk Assessment

We carry out all risk assessments and method statements before starting work. All safety precautions and checks have been carried out before cleaning and disinfecting your water tanks, including a visual inspection. Our technicians would inform the relevant personnel of any interruption, disturbances or potential of such, to the water supply that may occur. They also carry out a visual inspection of the electrical equipment and the storage tank, logging and reporting any leaks or problems before commencing work (if the tank has a division then each compartment will be cleaned individually ensuring a constant water supply). In addition to wearing PPE throughout all stages to ensure maximum safety, our technicians also liaise with the authorised personnel to restrict access to the water storage tank during working hours and minimise downtime.

Water Tank Cleaning

Any debris is cleared, and then the tank is filled with fresh water then filled again with sodium hypochlorite and chlorine. A disinfection period is held for 60 minutes, if disinfection is successful, the Chlorine solution is then neutralized using a validated solution. After completing this stage, our operators then test the water for correct ppm levels to ensure free chlorine level within the tank is comparable to the incoming mains and toxicity is kept to the minimum.


A certificate of disinfection is issued in accordance with ACOP L8 (2001) requirements, outlining the outcomes of the service as well as further suggestions and recommendations to minimize contamination of water tanks and other water outlets. Also, water samples may be taken to further test for potential contamination, if required.

Book an appointment

For a free, no obligation consultation, book an appointment with one of our specialists to discuss your specific cleaning requirements.
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1. . https://www.hse.gov.uk/healthservices/legionella.htm.