t: 020 8337 3516   f: 020 3277 1015   e: info@hawtl.co.uk

Legionnaires' Disease Control


Legionnaires disease is an illness contracted by breathing in water vapor containing the Legionella bacteria. Legionella bacteria is a common water bourn bacteria which multiples quickly under the right conditions. Building services water systems such as Cooling Towers, Water Tanks, Hot Water Heaters & Calorifiers provide ideal breading grounds for Legionella Bacteria as the water temperature within these systems can be found at the ideal range of 20 -45c for the Legionella bacteria to grow and multiply. Building services water systems also provide the ideal mechanism for distributing the Legionella bacteria through contaminated water vapor via Cooling Towers, showers, spray taps, Spa Baths Jacuzzis and other water spray systems.

All water systems are a potential risk and as such require a risk assessment to be undertaken by a competent person in accordance with guidelines issued from the Health & Safety Commission namely ACOP L8 ‘ The control of Legionella bacteria in water systems’. Once a water system risk assessment has been completed the risks will be identified and control measures put in place. Control measures will include a number of options from risk elimination, maintaining the water outside the optimum Legionella growth range of 20 -45c, cleaning and disinfection of cold water tanks and hot water heaters, chemical treatment programs for cooling towers and evaporative condensers which would include the use of specialist inhibitors, biocides and dispersants, cleaning and disinfection of cooling towers and evaporative condensers.

The water hygiene risk and Legionnaires disease assessment will also establish maintenance and monitoring programs that will be required in order to maintain the water  systems without risk to health of the buildings occupants and visitors. The monitoring and maintenance programs would typically  include a mix of temperature monitoring, inspection and sampling for domestic water system, chemical testing, weekly inspections and monitoring for cooling towers and evaporative condensers.

Howlett Associates Water Treatment ltd is a long established water treatment and water hygiene company specializing in the control and maintenance of water systems that are potential risks for Legionnaires disease. Howlett Associates Water Treatment ltd offers a UK wide service maintaining water systems for a wide variety of clients including multi site UK customers, maintenance contractors, food industry processors, CHP plants, Hospitals, Local Authorities, Hotels and end site users. Howlett Associates Water Treatment ltd products supplied to these customers range include Legionella risk assessments, cold water storage tank cleaning, calorifier and hot water tank cleaning and inspection, cold water tank refurbishment, cooling tower treatment, cooling tower cleaning and disinfection, bacteriological testing and sampling, Legionella testing and sampling.

Howlett Associates Water Treatment ltd employs an in house specialized work force trained in accordance with the Legionella Control Association training matricesto deal with Legionnaires disease. Howlett Associates Water Treatment ltd operation conforms to the latest ISO 9001 standards, in addition Howlett Associates Water Treatment ltd are members of The Legionella Control Association, CHAS,  Safe Contractor, Water Management Society & BACS.

In addition to Legionella related activities Howlett Associates Water Treatment ltd also undertake Air Hygiene surveys, ductwork cleaning and disinfection and steam boiler treatment. Howlett Associates Water Treatment ltd is a firm believer in technology, innovation, improvements to working practices and presentation of information to clients, such an innovation and improvement is that all field staff use PDA’S to capture field data in order to provide the correct compliance certification which is synchronized in real time and posted on the Howlett Associates Water Treatment ltd secure web portal for storing customer information which can be accessed by the customer at any time.

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Howlett Associates Water Treatment Ltd
1st Floor, Park House, 1 - 4 Park Terrace,
Worcester Park, Surrey, KT4 7JZ.
t: 020 8337 3516
f: 020 3277 1015
e: info@hawtl.co.uk
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