A partially blocked drain may start as a small nuisance but can quickly become a costly issue if left unchecked. Early warning signs are usually easy to notice and can help you prevent more serious blockages, leaks, or flooding later. As drainage specialists, Exjet assists homeowners and businesses across the South West in identifying the cause of partial blockages and restoring normal flow before damage happens.
What Causes a Partial Blockage
Drains are intended to carry wastewater and small quantities of waste material, but when unwanted substances enter the system, they can build up on the pipe walls and obstruct flow. Common causes include:
- Grease and oil accumulation: When fats and oils cool, they solidify inside pipes, trapping other debris.
- Food scraps and coffee grounds can cling to grease deposits, narrowing the pipe diameter.
- Soap scum and hair: In bathrooms, soap residue combines with hair to form dense clumps.
- Structural issues: Cracked or displaced joints underground can trap waste and cause partial blockages.
- Tree roots: Roots can penetrate pipework through tiny cracks, slowly reducing the water flow.
Common Warning Signs of a Partially Blocked Drain
Slow Drainage
If water takes longer than usual to drain from sinks, showers, or baths, it often indicates a build-up of waste inside the pipe. The sooner this is detected, the easier it is to clear.
Gurgling or Bubbling Sounds
Unusual noises when water drains away suggest air is trapped in the system. As water passes through a narrow section, air pockets form and produce a bubbling or gurgling sound. This indicates that a blockage is forming.
Unpleasant Smells
Foul odours from plugholes, floor drains, or outdoor gullies usually indicate organic material decomposing inside the pipework. Smells from kitchen sinks often stem from grease and food residue, while bathroom drains may accumulate hair and soap scum.
Water Rising or Backing Up
If water rises in the sink or toilet when another fixture is used, the system may not be venting correctly due to a partial blockage. In severe cases, wastewater can overflow and cause property damage.
Outdoor Damp Patches or Pooling Water
Persistent wet patches near external drains or manholes can signal a blockage or damaged pipe underground. This should be inspected promptly to prevent further deterioration.
How to Fix or Prevent Partial Blockages
Try Simple Cleaning First
Pouring boiling water down the drain can help dissolve light grease or soap build-up. A natural mixture of baking soda and vinegar can also assist in removing odours and mild residue without damaging pipes.
Avoid Chemical Drain Cleaners
Many chemical cleaners are harsh and can damage older pipework. They may offer temporary relief but often fail to eliminate the root cause of the problem.
Check Traps and Gullies
Clear removable traps beneath sinks and check outdoor gullies for leaves or debris. Regular maintenance stops small blockages from turning into big problems.
Call a Professional for Persistent Problems
If drains remain slow or smells persist, the problem is likely deeper within the system. Exjet’s engineers employ advanced CCTV drain surveys to precisely identify the cause and use high-pressure water jetting to safely clear obstructions. If damage is found, our no-dig pipe repair technology can seal cracks and restore normal flow without excavation.
Why Early Action Matters
A partial blockage rarely clears itself. Over time, debris builds up until the pipe is fully blocked. This may cause flooding, structural damage, or health risks from wastewater backing up. By recognising the signs early and contacting a professional drainage company, you can prevent serious disruption and avoid emergency callouts.
Drainage Support from Exjet
Exjet offers comprehensive drainage solutions for domestic and commercial customers across the South West. Our services include CCTV drain inspections, high-pressure jetting, planned maintenance, and lining repairs. With decades of experience and industry-leading equipment, our engineers provide quick, safe, and effective solutions for any drainage problem.
Final Thoughts
Partially blocked drains are easy to overlook but can quickly cause serious problems if not addressed. Slow drainage, gurgling sounds, and unpleasant odours are all early signs that should not be ignored. Contact Exjet today to arrange a professional inspection and ensure your drainage system functions smoothly.