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Clogged Drains

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Unblock clogged sinks, tubs, showers, toilets and floor drains. Tell us about your clogged drain project and we’ll help you find local plumbers who serve your area.

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A clogged drain rarely appears out of nowhere. More often, water leaves a sink or tub a little more slowly each week until one day it stops, or a toilet that has been sluggish for a while finally overflows. Where the clog shows up, and what else in the house misbehaves at the same moment, says a lot about what is blocking the pipe and how far down it sits.

Many single-fixture clogs can be cleared safely by the homeowner with a plunger, a bucket and a few minutes under the sink. Others signal something a plunger can't reach: a blocked vent on the roof, a partly obstructed main drain, or a municipal sewer overwhelmed by a storm. Telling them apart saves a service call in the first case and can spare you a flooded basement in the second.

This page helps you read the symptoms, try the first steps that are safe, skip the shortcuts that cause more harm than good and recognize the moment to call a plumber. The equipment professionals use to clear a stubborn line is covered on the drain cleaning page.

What a clogged drain tells you: reading the symptoms fixture by fixture

Start by noting which fixtures are affected and when it happens. One slow drain almost always means a blockage close to that fixture, in its trap or the short pipe behind it. Two fixtures that sit side by side, such as a bathroom sink and the tub next to it, point to the branch they share. When the lowest drain in the house acts up as soon as water runs elsewhere, the blockage is further downstream.

  • Kitchen sink: grease, starch and food scraps usually form a plug in the trap or the pipe behind the wall, and in a double sink one bowl may fill while the other drains.
  • Bathroom sink: hair and toothpaste wrap around the pop-up stopper, so the clog is often within reach just below the drain opening.
  • Tub or shower: hair bound together with soap forms a mat under the strainer or in the trap beneath the floor.
  • Toilet: too much paper at once, a wipe or a small object dropped by a child blocks the trap built into the bowl, while the rest of the house drains normally.
  • Laundry tub or washing machine standpipe: lint and fibres collect in the trap until the water overflows when the machine pumps out.
  • Basement floor drain: sediment and debris can block it on its own, but water rising out of it usually comes from further down the main line.

Safe first steps to unclog a drain yourself

Before trying anything, stop running water into the blocked fixture and anything that drains into it, and hold off on the dishwasher and the washing machine. Then work from the gentlest step to the most involved. If a chemical product is already sitting in the drain, leave the plunger and the trap alone and let the plumber know which product is in the pipe.

  • Pull out and clean the strainer, pop-up stopper or shower grate; many bathroom clogs come out with them.
  • Use a cup plunger on sinks, tubs and showers and a flange plunger on toilets, with enough water to cover the rubber and a steady push and pull rather than hard jabs.
  • Block the overflow opening of a sink or tub, or the second bowl of a double sink, with a wet cloth so the pressure goes toward the clog.
  • Under a sink, set a bucket beneath the trap, loosen the slip nuts or the trap's cleanout cap by hand and clear out what's inside, then reassemble it and run water to check for drips.
  • A short hand auger can reach a clog just past the trap or in a toilet bowl; feed it in gently and stop if it binds.
  • If the water in the toilet bowl keeps rising, lift the tank lid and press the flapper closed, then turn the shut-off valve behind the toilet clockwise.

Why chemical drain cleaners are a poor way to unclog a drain

Health Canada names drain cleaners among the household chemicals that can cause poisonings, burns, fires or explosions when they aren't handled safely, and warns that corrosive products can burn the skin and eyes and damage the throat and stomach if swallowed. The danger doesn't end once the bottle is empty: in a sink already full of standing water, the product sits there diluted and out of sight, ready to splash back as soon as someone reaches in or picks up a plunger.

A household clog is also usually a physical plug of hair, grease or paper, and a liquid poured on top has trouble working its way through it. Health Canada further warns never to mix bleach with other cleaning products, especially ones containing ammonia or acids, because the combination can give off toxic gas, so reaching for a second product when the first one fails is a real risk. If you keep a drain product at home anyway, read the hazard symbols on the label and store it tightly closed in its original container, out of sight and reach of children and pets.

Clogged drain or blocked plumbing vent? How to tell the difference

A drain needs air as well as a clear pipe. Vent pipes tied into the drainage system rise through the house and out the roof, letting air in behind the water so it flows smoothly and the traps keep their seal. When a vent is blocked, water still goes down, but slowly and noisily: sinks gurgle, toilets bubble or lose water from the bowl, and a sewer smell can drift up from a trap that has been sucked dry.

A vent problem tends to affect several fixtures on the same branch without any water backing up, and plunging changes little. During a long Canadian cold snap, frost can build up inside the top of a vent stack, and heavy snow, leaves or a bird's nest can cover the opening. Clearing a vent means working on the roof, so leave it to a plumber or roofer with proper fall protection rather than climbing up yourself.

When a clogged drain is really a sewer line problem

Some clogs aren't in a fixture at all. When water or sewage comes up through the basement floor drain, a basement shower or the lowest toilet, the main drain or the sewer beyond it is involved, and every litre used upstairs makes things worse.

  • Stop using water throughout the house: no flushing, showers, dishwasher or laundry until the line is clear.
  • Keep children and pets away from the water, and wear rubber boots and gloves if you have to walk through it.
  • Stay out of a flooded basement if the water is near outlets, the furnace or the electrical panel, and have the power cut by your utility or an electrician.
  • If the backup starts during heavy rain or snowmelt and neighbours are affected too, report it to your municipality, since the public sewer may be overloaded.
  • If only your house is affected in dry weather, call a plumber: the blockage is most likely in your own main line.

How to prevent clogged drains in the kitchen, bathroom and basement

  • Keep coffee grounds, eggshells, rice and pasta out of the sink, garbage disposer included, since they swell or pack together in the trap.
  • Pull out the bathroom sink stopper every so often and clean off the hair and residue before they become a clog.
  • Fit a lint catcher on the washing machine's drain hose or the laundry tub, and empty it after big loads.
  • Pour a pail of water into a basement floor drain that rarely gets used, so its trap stays full and sewer gas stays out.
  • During renovations, keep grout, plaster, drywall compound and tile adhesive out of drains; rinse tools in a bucket and let the solids settle before disposal.

Clogged Drains: frequently asked questions

Why does my sink gurgle when I flush the toilet?

Gurgling means air is being pulled through the water in a trap. When a nearby sink or tub gurgles as the toilet empties, the drain they share is partly blocked or the vent serving it isn't letting in enough air. If the drains are also slow, or several fixtures gurgle, have a plumber check the branch line and the vent.

What should I do if my toilet is about to overflow?

Don't flush again. Take the lid off the tank and push the rubber flapper at the bottom down so no more water enters the bowl, then close the shut-off valve on the wall behind the toilet. Once the level drops, try a flange plunger. If water also shows up in a tub or floor drain, the main line is involved and you need a plumber.

Do baking soda and vinegar unclog a drain?

The fizzing looks busy, but it doesn't break up a plug of hair or grease the way a plunger or a cleaned-out trap does. It's mild enough to try on a slow drain, but if water still sits in the sink afterwards, move on to mechanical steps or a plumber rather than stronger products.

Why does my basement floor drain smell like sewer?

Usually its trap has dried out. The water held in the trap is what blocks sewer gas, and a floor drain that never receives water slowly loses it to evaporation, especially in a heated basement in winter. Pour water into it to refill the trap. If the smell returns quickly, the drain may have a crack, a missing cleanout plug or a venting problem worth checking.

When should I stop trying and call a plumber for a clogged drain?

Call when a plunger and a cleaned trap haven't solved it, when more than one fixture is affected, when water comes up through a floor drain, or when the same drain keeps clogging. Call as well if you've already poured a chemical cleaner into standing water, so the plumber can come prepared.

Sources

  1. Health Canada: Use household chemicals safely

Written by the LokalMatch editorial team. Last reviewed September 10, 2026.

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What affects the cost of clogged drain

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Type of problem and how easy it is to find
  • Access to pipes behind walls, under floors or underground
  • Parts and fixtures chosen
  • Age and material of the existing pipes
  • Emergency, evening or weekend service
  • Permits and inspections, where required

How to compare plumbers before you hire

  • Hire a plumber who is licensed for this work in your province, especially for gas water heaters, sewer lines and new plumbing.
  • Ask whether they charge a flat rate or by the hour, and what the call-out fee covers.
  • For leaks and drain problems, choose someone who explains the cause and doesn't only clear the symptom.
  • Get the scope in writing for larger jobs such as a water heater, sewer repair or re-piping.
  • If it's urgent, ask how soon they can arrive and whether after-hours rates apply.

Questions to ask plumbers before you hire

  • Are you licensed for plumbing work in my province?
  • Do you charge a flat rate or by the hour, and is there a call-out fee?
  • What do you think is causing the problem?
  • Will this work need a permit or an inspection, and who will arrange it?
  • Will you need to open walls, floors or the yard to reach the problem?
  • What warranty do you offer on parts and labour?

When to call a pro for clogged drain

  • An active leak: shut off the main water valve if you can reach it safely, then call a plumber.
  • Sewage backing up into drains or the basement
  • No hot water, or water pooling around the water heater
  • Pipes that may have frozen during a cold snap

Clogged drain permits and local rules

Some clogged drain work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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