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EMSD announces latest sampling results for Legionella bacteria at fresh water cooling towers

     The Electrical and Mechanical Services Department (EMSD) today (August 7) announced that the department tested 93 water samples collected from cooling towers in 72 buildings in its routine inspections in July this year. Three samples were detected to have a Legionella bacteria count (LBC) at or above the upper threshold, which is 1 000 colony-forming units per millilitre. The latest statistics are set out in Annex 1.
     The cooling towers in which the three samples were collected in July are located at Phase 2, Kwai Shing Industrial Building, 42-46 Tai Lin Pai Road, Kwai Chung; Wah Sing Industrial Building, 12 Wah Sing Street, Kwai Chung; and Air Goal Cargo Building, 330 Kwun Tong Road, Kwun Tong. The EMSD has issued nuisance notices under the Public Health and Municipal Services Ordinance to the owners of these cooling towers requiring appropriate disinfection work to be done. Disinfection of the cooling towers in these three cases has already been completed by the owners. Details of these three cases, as well as the locations of buildings served with nuisance notices during the preceding three-month period because the LBC was found in their fresh water cooling towers to be equal to or above the upper threshold, are set out in Annex 2. The EMSD publishes the latest statistics of the above information on a half-monthly basis on its website (

     The EMSD reminds fresh water cooling tower owners that they are responsible for designing, operating and maintaining cooling towers properly. They should arrange regular inspections, timely maintenance and periodic testing of the water quality in their cooling towers in accordance with the Code of Practice for Water-cooled Air Conditioning Systems issued by the department to prevent the proliferation of Legionella bacteria.

Ends/Friday, August 7, 2015
Issued at HKT 14:01


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