A blocked drain rarely fails overnight. Warning signs usually build for weeks, since grease, hair and wipes collect slowly. Spot them early and the fix is often smaller.
Why drains block
Most blockages come from a few causes. Grease sets inside kitchen pipes, while hair and soap collect in bath and shower traps. Wipes and cotton buds do not break down, so they catch other waste in toilet drains.
Tree roots can also enter cracked pipes outside. Roots catch debris and slow the flow, yet you may not see them from indoors. That is why outdoor drains need a camera check when problems repeat.
1. Water that drains slowly
A sink that takes longer to empty is the most common early sign. Water may also pool around your feet in the shower. This usually means a partial blockage, and it tends to get worse.
2. Gurgling sounds
Gurgling from a plughole or toilet means air has nowhere to go. The air struggles past a blockage as water moves through the pipe. Listen for it after you flush or empty a basin.
3. Bad smells
A foul smell from a drain means something is rotting in the pipe. Food waste and grease cling to the pipe wall, so they are common causes. The smell can return even after you pour bleach down the drain.
4. A toilet that rises or clears slowly
If the bowl water rises higher than normal, the drain may be partly blocked. It may also take a long time to settle after a flush. Check whether other toilets in the home do the same, which points to the main drain.
5. Water coming back up
Water that comes back up through a drain or toilet is serious. Sewage can follow, and that is a health risk. Stop using water and read our guide on whether a blocked drain is an emergency.
6. More than one blocked fixture
If two or more fixtures run slowly at once, the blockage is probably in the shared run. A single slow basin, in contrast, points to its own waste pipe. This difference helps an engineer decide where to start by narrowing the search.
7. Damp patches near drain pipes
A damp patch on a wall or floor near a pipe may mean a leak. Pressure from a blockage can force water out of a weak joint. Left alone, it can lead to mould and damage to walls and floors.
What to try first
- Stop running water into the affected drain
- Use a plunger on a sink or toilet for a minute or two
- Skip chemical cleaners on a full blockage, because they can sit in the pipe and harm you
A plunger may clear a minor slow drain. Repeat problems, however, need a proper look. A camera check shows what a plunger cannot, so it saves guesswork.
When to ask a drainage engineer
If the signs keep returning, ask a drainage engineer to inspect the line. A CCTV drain survey shows the pipe condition on camera. Then high-pressure drain jetting can clear grease and silt.
For a full blockage, see the blocked drains service. If sewage is rising, use the emergency drain services page and mark your request urgent. The request form takes requests 24/7.
Ask the engineer for a written quote before work starts. Also ask whether there is a call-out charge, since policies differ. For example, you can read about blocked drains in Chelmsford before you decide.
Drain help by town
If you live in Brentwood or Witham, the pages on drain unblocking in Brentwood and drain unblocking in Witham list what to ask. Grease is a common cause, so drain jetting in Great Baddow is worth a look too.