Signs of a Blocked Drain You Shouldn’t Ignore

Most blocked drains don’t happen overnight. They build up gradually, and by the time water is actually backing up, the blockage has usually been forming for weeks. Catching the early signs saves you money, and usually means the difference between a quick drain clean and an emergency call-out after a pipe backs up into your home.

1. Water Draining Slower Than Usual

This is almost always the first sign. A bath, shower or basin that used to drain instantly but now takes 20-30 seconds to clear is telling you something is narrowing the pipe — grease, hair, soap buildup, or in older Johannesburg and Pretoria homes, sometimes tree root intrusion further down the line.

2. Gurgling Sounds From Drains or Toilets

If you flush a toilet and hear gurgling from a nearby sink or shower drain, air is being trapped and forced through the pipes because something downstream is partially blocking normal flow. This is a genuinely reliable early warning sign, even before you notice any slowdown in draining.

3. Bad Smells Coming From Drains

A blocked drain traps organic material — food waste, hair, soap scum — which starts to break down and smell well before the blockage is severe enough to stop water flowing. If a specific drain smells bad even when it’s not in use, that’s usually your answer.

4. Water Backing Up in an Unexpected Place

This is the sign that means “call someone now,” not “keep an eye on it.” If flushing a toilet causes water to rise in a shower drain, or running a washing machine causes water to appear in a totally different part of the house, you likely have a blockage in your main drain line, not just a single fixture.

5. Multiple Drains Affected at the Same Time

One slow drain is usually local to that fixture. Several slow drains at once — say, your kitchen sink and a bathroom basin — points to a blockage further down the shared line, which is a bigger job than clearing a single trap.

What Causes Most Blockages in Gauteng Homes

• Fat, oil and grease poured down kitchen sinks (the single most common cause)
• Hair and soap buildup in bathroom drains
• Wet wipes and sanitary products flushed instead of binned — these don’t break down like toilet paper does
• Tree roots finding their way into older clay or cracked pipe joints, especially common in established suburbs like Norwood, Parkview and Bedfordview
• Ground movement or settling affecting underground pipe joints over time

What You Can Try Before Calling a Plumber

A plunger on a single slow drain, or a kettle of hot (not boiling, for plastic pipes) water and a small amount of dish soap poured down slowly, can sometimes clear minor soap or grease buildup. Avoid chemical drain cleaners if you can — they’re hard on older pipes and don’t touch solid blockages like roots or built-up debris.

When It’s Time to Call Us

If the blockage doesn’t clear with basic measures, if more than one drain is affected, or if you’re seeing water back up anywhere unexpected, it’s time for a proper inspection. We use drain rodding and, where needed, camera inspection to find exactly what’s blocking the line and where — rather than guessing.

Dealing with a blocked drain? 247 Plumbers GP offers 24/7 drain cleaning across Midrand, Johannesburg, Pretoria and Gauteng, with no call-out fee. Call 072 280 7603 or get a quote.