A blocked drain rarely appears overnight. Warning signs often build up over weeks, so you can act before the pipe blocks fully. Spotting them early may save you a messy clean-up.
1. Slow Draining Water
Slow water is often the first sign. Your sink may take longer to empty, or water may pool around your feet in the shower. This usually points to a partial blockage, and it tends to get worse over time.
2. Gurgling Sounds
Gurgling from a plughole or toilet can mean air is trapped in the pipes. A blockage that slows the flow of water often causes this. Listen for it after you flush or empty a sink.
3. Unpleasant Odours
A bad smell from a drain can mean waste is sitting in the pipe. Food scraps and grease can cling to the pipe walls and rot there. The smell may come and go, but it rarely fixes itself.
4. Rising Water in the Toilet
Water in the toilet may rise higher than normal when you flush. It may also take a long time to drop back down. If this happens in more than one toilet, the blockage is probably further along the drain.
5. Water Coming Back Up
Water that comes back up through a drain or toilet is a serious sign. It can lead to flooding, and sewage may reach your home. Treat it as urgent, and read what to do in a drain emergency while you wait for help.
6. More Than One Blocked Fixture
When several drains in your home run slowly at once, the blockage may sit in the main drain. One shared pipe can affect every fixture that joins it. Because of this, a camera check can help find where the problem is.
7. Damp Patches or Water Marks
Damp patches on walls or floors near drainage pipes can mean a leak. A blocked pipe can put extra pressure on a weak joint, so water may escape. If you leave it, the damp can spread and mould may grow.
Who Looks After the Pipe?
Before you book anyone, find out who owns the pipe. The homeowner is responsible for the private drain that runs from the home to the property boundary. Past that point, the drain usually becomes a public sewer, and Scottish Water looks after the public sewer network.
What to Do Next
A slow sink may clear with a plunger. However, if the problem keeps coming back, ask a drainage engineer to take a look. A CCTV drain survey can show what is wrong inside the pipe, and high-pressure jetting can clear many blockages.
If a drain is fully blocked, see the blocked drains service. You can send a request for blocked drain help in Glasgow at any hour, because the online form is open 24/7. The same goes for drainage help in East Kilbride and blocked drain help in Coatbridge.
Mark your request urgent if sewage is coming back into your home. For a bigger problem, see the emergency drain services page and the Glasgow drainage coverage page.
Request a Quote and ask the engineer for a written quote before work starts.
Related Guides
- Read what to try with a blocked toilet if the toilet is the problem.
- Use a checklist for a blocked drain emergency to judge how urgent your problem is.
- Follow the first steps when sewage backs up if sewage is involved.