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ComplianceCooling tower compliance in Hong Kong, in plain language
If your building has a fresh water cooling tower, these are the rules — and the numbers — you need to know.
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If your building has a fresh water cooling tower, these are the rules — and the numbers — you need to know.
If your building has a fresh water cooling tower, the EMSD Code of Practice makes you, the owner and duty holder, responsible for keeping it safe: a continuous treatment programme, regular testing, cleaning and disinfection on schedule, and a dated record of every visit. Legionella below 10 cfu/mL counts as “undetected” — that is where a good programme keeps you — and hiring a contractor does not move the legal responsibility off the owner.
The EMSD (Electrical & Mechanical Services Department) regulates fresh water cooling towers in Hong Kong through its Code of Practice for Fresh Water Cooling Towers. The goal is to control Legionella, the bacteria that causes Legionnaires’ disease.
Print the checklist — the one-page version of this page for your plant room: the Legionella action bands, the recurring duties and a JAN–DEC tick grid.
And one date to know separately: since 2011 the EMSD can enter premises and sample cooling towers at random. You do not get notice.
When a tower receives a nuisance notice, EMSD publishes the building's location. The list is public — your tenants can read it. Keep your building off it.
The building owner and duty holder. This is the part many people miss: hiring a contractor does not move the legal responsibility off the owner. If the work is not done properly, or the records are not there, the liability stays with you.
What actually protects an owner is two things together: proper treatment that keeps the water safe, and documents that prove it was done. Gotech provides both.
Two longer guides sit behind this page, each with a different job. The EMSD Code of Practice, in plain English walks through the rulebook itself — the water quality table, the Legionella action ladder, cleaning frequency and the record rules. Legionella and cooling tower compliance covers the enforcement side — what happens when a test fails, advisory letters, nuisance notices under Cap. 132, and who carries the duty.
A total Legionella count at or above 1,000 cfu/mL triggers a statutory nuisance notice and mandatory emergency decontamination, and failing to comply with the notice is an offence. Between 10 and 1,000 cfu/mL on EMSD's own sample draws an advisory letter, and the Code requires immediate on-line disinfection and a re-test. Below 10 cfu/mL counts as “undetected”. EMSD can sample fresh water cooling towers at random without notice, and when a tower receives a nuisance notice EMSD publishes the building's location.
We will assess your towers and set up a programme that keeps you under the limit.