Blocked Drain, Supply Leak or Seepage: Who to Call in Hong Kong

Record the symptom before you choose a provider. A blocked fixture, a moving water meter, and a damp ceiling point to different checks. None of them proves the location or cause of a defect.

Record the symptom without naming the cause

Write down the affected room or fitting, the first date seen, the time pattern, and the area that you can access. Add photographs and meter readings with timestamps. Ask neighbours or building management whether another unit or common area shows the same problem.

Describe what you observed. Avoid labels such as “burst pipe”, “failed waterproofing”, or “upper-flat leak” until someone inspects the relevant system.

Separate the drainage, inside-service, and seepage paths

Use the complaint to choose the first record and contact, not to make a diagnosis.

Reported problem	First record to check	First contact to consider
Drainage blockage or defect	Building drainage and management records	Building management, a competent drainage contractor, or a building professional
Suspected inside-service leak	Water meter observations and the plumbing serving the flat	The registered consumer, management for public housing, and a licensed plumber
Ceiling or wall seepage	Access history, affected locations, and neighbouring units	Building management, a building technician, or a licensed plumber for investigation

The Water Supplies Department says the registered consumer maintains the internal plumbing that serves the consumer’s house or flat. It gives a water-meter observation check and tells a consumer to engage a licensed plumber when the reading indicates an inside-service leak. WSD also warns that ceiling or wall seepage may come from drainage, failed seals, or rainwater rather than a supply pipe.

For public housing, the same WSD page directs residents to the management office for maintenance of estate internal plumbing.

Use the responsibility record before requesting a quotation

The Buildings Department drainage page encourages building owners, owners’ corporations, and building management and maintenance personnel to inspect drainage systems and sanitary fitments. It says owners may carry out drainage repairs under the Minor Works Control System. An order can call for a competent contractor, and a complicated case can call for an Authorized Person.

Ask management whether the affected pipe serves one unit or forms part of the building drainage system. Request any plan, prior repair record, access note, or notice that can help the provider define the inspection. Leave responsibility unresolved when the pipe route or defect location remains unknown.

Ask the provider to define the investigation

Send each provider the same observation sheet. Ask for a written proposal that states:

• the system and area the provider will inspect;
• the access needed from your unit, another unit, or a common area;
• the tests or opening-up work proposed;
• the person who will perform each part of the work;
• the evidence you will receive after inspection;
• the repair scope that needs a new quotation.

Do not accept a repair quotation that assumes a cause the provider has not inspected. A plumber’s registration or a contractor’s listing does not prove that the quoted scope covers drainage, waterproofing, structural fabric, and water supply work.

Use the Joint Office for its stated role

FEHD’s water-seepage FAQ lists water-supply pipes, drainage pipes, waterproofing, and rainwater paths as possible sources. It tells owners to engage a building technician or licensed plumber to identify the cause and points to building management or the owners’ corporation for help with a neighbour dispute.

The same FAQ says the Joint Office enforces public-health nuisance provisions for water seepage. It may refer building defects to the Buildings Department or water wastage to WSD. Keep working with owners and management on access and repair evidence; the Joint Office does not replace the contractor or professional who investigates and repairs the private building.

Common questions

Does a damp ceiling prove that the upper flat has a supply-pipe leak?

No. WSD says ceiling or wall seepage may come from drainage pipes, defective seals, or rainwater as well as water-supply plumbing. Record the symptom and arrange an inspection.

Should I call a plumber for every blocked drain?

Start with the pipe and responsibility evidence. The Buildings Department encourages building owners, owners’ corporations, and building management and maintenance personnel to inspect drainage systems and sanitary fitments. Ask management which system the blockage affects before fixing the scope.

Will the Joint Office repair the seepage?

The FEHD FAQ describes the Joint Office as an enforcement body for water-seepage nuisances that may refer building defects or water wastage to the relevant department. Owners still need to arrange investigation, access, and repair work.