Home drains smell or run slowly: water seals, checks and maintenance

Identify the scope and records

BD's drainage FAQs explain that a U-trap needs water to function properly. If you do not know whether a sanitary fitting has a trap, ask management or an experienced drainage contractor to inspect it. The maintenance leaflet recommends about half a litre of water into each floor drain every week. If the outlet cannot be located, ask for help identifying it rather than drilling the floor or dismantling a fitting to search for it.

Official maintenance material identifies odours, unusual sounds, cracks, rust stains, loose supports, leakage, blockage and toilet bubbling as observations worth checking. A smell is not a source diagnosis, and replenishing water cannot repair a broken pipe. A branch inside the flat and a shared vertical stack may require different access and responsibility arrangements. Identify the location and obtain suitable inspection for a persistent defect instead of waiting for a repair order before maintaining the system.

Practical steps to follow

1. List safely accessible bathroom, kitchen and balcony outlets and note when slow drainage or odour occurs. Record any relationship to rain, prolonged non-use or other water activity as an observation, without claiming that a neighbour has caused the problem.
2. Maintain floor-drain water seals using the leaflet and keep objects out of toilets and outlets. Arrange inspection if odour or backflow persists or the layout is unclear. Repeatedly combining chemicals or altering pipework experimentally is not a substitute for identifying the defect.
3. Send the location, dates, images and observations to management or the landlord and ask who will inspect the private or shared part. Management should coordinate safe access and appropriate work qualifications where an external or common drainage pipe is involved.
4. Ask the quotation to identify the defect, location, method and completion check. If BD serves a drainage repair order, keep it in full and arrange the work according to its stated scope and time, confirming whether the minor-works procedures apply.

A worked example and wording to adapt

A little-used bathroom develops an odour. The resident identifies the floor drain, replenishes its water using the official maintenance advice and records the result. When the smell persists, the message to management says: 'Odour continues after replenishment; I cannot confirm the trap condition. Please arrange an inspection.' A contractor identifies a branch-pipe defect and describes its location and repair method. The resident retains the completion record instead of treating a temporary improvement in smell as verification of the whole drainage system.

Follow-up and completion checks

After repair, record whether slow drainage, odour or leakage recurs during ordinary use and follow the contractor's inspection arrangement. If several units or a shared exterior pipe are involved, provide the information to management for coordination. Fixing one visible joint does not establish that the shared defect has been resolved.

Keep clear of an affected area and seek help where sewage overflows, surfaces become slippery or components could fall. Routine household records and documents demonstrating compliance with a repair order serve different purposes. Clarify the reporting and submission requirements for an order instead of retaining only a payment receipt.