# Toilet gurgling or bubbling: what it means and what to do

Updated: 2026-10-24 · https://pros411.com/en/guides/plumbers/toilet-gurgling

## Short answer

Gurgling means air is trapped in the drain. Plunge the toilet with a flange plunger to clear a partial clog. Does it also gurgle when the shower, sink or washer drains, or does water back up in the tub? Then the main sewer line is likely clogged: stop using water and call a plumber. A blocked plumbing vent on the roof causes it too. Leave that to a plumber.

> Safety first: Do not climb onto the roof to check the vent: a plumber has the gear to clear it safely. Do not pour chemical drain cleaner into a gurgling toilet.

## What to do when a toilet gurgles

![Cartoon toilet gurgling, with bubbles rising in the bowl](https://pros411.com/img/guias/toilet-gurgling.webp)

1. **Bubbles and gurgles in the bowl.** Air is pushing back up through the water. Something in the drain or the vent is not letting air and water move freely.
2. **Plunge it with a flange plunger.** Seal the cup over the drain hole and give it 10 to 15 firm pushes. A partial clog in the toilet is the easiest cause to fix.
3. **Other drains gurgle too? Main line.** Gurgling when the shower or washer drains, or water rising in the tub, points to a clog in the main sewer line. Stop using water and call.
4. **A clogged roof vent can do it.** Leaves, nests or ice can block the vent pipe on the roof. Do not climb up there: a plumber clears it safely.
5. **Quiet bowl.** Gone after plunging? You are done. If the gurgling comes back, call a plumber to check the vent and the line.

## Why it happens

- A partial clog in the toilet or its drain: water squeezes past and drags air with it.
- A clog in the main sewer line: every fixture that drains pushes air out through the toilet.
- A blocked plumbing vent: drains cannot pull air from the roof, so they pull it through the toilet water.
- Tree roots in an old sewer line, common in older homes with big trees nearby.

## What not to do

- Do not climb onto the roof to look at the vent, least of all when it is wet or icy.
- Do not pour chemical drain cleaner in the toilet. It rarely reaches the clog and is dangerous for whoever opens the drain later.
- Do not keep running the washer or the shower if water comes up in the tub: it has nowhere to go.

## When to call a plumber

- Water backs up in the tub or shower when you flush or run the washer.
- Several drains in the house are slow or gurgle at once.
- The gurgling comes back after plunging.
- You smell sewer gas in the bathroom.

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## Frequently asked questions

### Why is my toilet gurgling?

Air trapped in the drain is escaping through the toilet water. The cause is a partial clog, a clog in the main sewer line or a blocked plumbing vent.

### Why does my toilet gurgle when the shower drains?

The shower water is pushing air through the toilet, which points to a clog in the shared drain or the main line, or a blocked vent. Call a plumber.

### Is a gurgling toilet an emergency?

Not by itself. It is urgent if water comes up in the tub or other drains, or sewage backs up: stop using water and call a plumber now.

### Can a blocked vent make a toilet gurgle?

Yes. Without air from the vent, draining water pulls air through the toilet instead. A plumber can clear the vent from the roof.

### Will a gurgling toilet fix itself?

Rarely. A partial clog usually gets worse. Plunge it once; if the gurgling comes back, have a plumber look.