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Traces of Legionella bacteria found in school water system

16th August 2016

Routine water system checks reveal Legionella bacteria at Chatham House and Clarendon House sites


During the annual inspection of the school’s water systems, the schools Water Quality Consultant reported finding samples of legionella bacteria in areas located within Chatham House (Lower School site) and Clarendon House (Upper School site).

The samples were confirmed in a report received by the school on July 13th 2016.

Legionella bacteria was only located in areas used by staff – the areas used by students are not affected – students health is not at risk.

Following receipt of the report, site staff immediately disconnected the infected areas from the water systems and placed signs within the infected areas advising staff not to use the taps in these areas.

The following week, the Water Quality Consultant undertook a complete cleanse and disinfecting of all the water systems throughout the whole school – even areas that showed a negative result.

The school notified both Public Health England (PHE) and the Health and Safety Executive (HSE) as it is a requirement when legionella is detected.

The schools water systems were completely disinfected between July 25th and July 28th 2016 – further checks will be carried out at the end of September 2016. 

I would like to reassure parents, students and staff that the areas detected pose an extremely low risk to public health and that only areas of the school used by staff were found to be infected.


Chris Freeman

Business Manager

Chatham & Clarendon Grammar School

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