Blocked drains are more than an inconvenience: they cause unpleasant smells, messy backups and, if ignored, real damage to your home. Most people assume the usual suspects, hair, food scraps and grease, are always to blame. In reality, several less obvious culprits could be lurking in your pipes. Below are six surprising causes of blocked drains, along with practical steps to prevent each one so your plumbing keeps flowing freely.
The everyday causes of blocked drains
Before the surprises, it is worth covering the basics. Hair, food scraps, grease and soap scum account for the majority of household blockages. Hair and soap build up in bathroom drains, while grease and food waste clog the kitchen sink. Caught early, these clear with a plunger or drain snake, but left alone they harden and demand professional help. Flushing anything other than toilet paper and human waste, wet wipes, paper towel or sanitary products, is another leading cause of serious backups.
6 surprising causes of blocked drains
With the obvious causes covered, here are the ones that catch most homeowners off guard.
1. Personal care product residue
Hair is a known offender, but shampoo, conditioner and body wash also leave a waxy residue that coats the inside of your pipes and narrows the channel water flows through. Fit a hair catcher in the shower drain and rinse thoroughly to limit product build-up.
2. “Flushable” wipes and sanitary products
So-called flushable wipes do not break down the way toilet paper does. They snag inside the pipe, trap grease and grow into the kind of mass that blocks municipal sewers, the notorious fatberg. Bin wipes, cotton buds and sanitary products rather than flushing them.
3. Cooking grease and fat
Food scraps are an obvious kitchen culprit, but poured-away cooking grease is worse. It looks liquid when hot, then solidifies inside the pipe and catches everything that follows. Collect fat in a container and throw it in the bin, and see our guide to kitchen fat traps for a longer-term solution.
4. Tree roots and outdoor debris
Trees and shrubs near your home send roots toward the moisture in underground pipes, forcing their way into joints and cracks. Leaves and soil can also wash into outdoor drains. If drainage slows after rain, have the line inspected, our article on signs of tree root invasion explains the warning signs.
5. Foreign objects and toys
Children are famous for flushing toys and small objects, but adults drop bottle caps, jewellery and cleaning sponges down drains too. Anything other than toilet paper and human waste can lodge in the pipe and cause a stubborn blockage. Teach children what may be flushed, and keep small items away from open drains.
6. DIY plumbing mistakes
Home plumbing projects can save money, but a badly fitted pipe, an over-tightened joint or the wrong fitting often creates the very blockage it was meant to prevent. If you are unsure, it is safer and usually cheaper to have the work done properly the first time.
How to prevent blocked drains
Now that you know the surprising causes, these habits will keep your drains clear:
- Fit hair catchers and sink strainers on every drain
- Bin wet wipes, sanitary products and cotton buds, never flush them
- Collect cooking grease in a container rather than pouring it down the sink
- Keep the yard clear of debris and watch for tree-root intrusion
- Teach children what may and may not be flushed
- Call a professional when a blockage keeps returning
The bottom line
Blocked drains are a nuisance, but knowing the surprising causes, and taking a few preventative steps, keeps costly repairs at bay. Be mindful of what goes down your sinks and toilets, keep outdoor drains clear, and call a professional when a blockage will not shift. A little awareness keeps your plumbing running smoothly all year round.
