If the water is rising, don’t flush again. That’s the first rule of how to unclog a toilet, and it’s the one most people break. A second flush adds a full tank of water to a bowl that has nowhere to send it. Stop the water, then work through three methods in order: a flange plunger, dish soap and hot water, and a toilet auger. Most clogs clear at the first step. If none of them works, the clog probably isn’t in the toilet at all, and this guide shows you how to tell.[/caption]

Key Takeaways

• If the bowl is filling, lift the tank lid and push the flapper down, then turn the shutoff valve behind the toilet clockwise.
• Use a flange plunger, not a flat sink plunger, and keep enough water in the bowl to cover the rubber cup.
• No plunger? Dish soap plus hot (not boiling) water softens many clogs; a toilet auger reaches what a plunger can’t.
• Skip chemical drain cleaners in a toilet. They splash back, and they make the next step dangerous for whoever plunges or augers it.
• If other drains gurgle or back up when you flush, the blockage is in the main line, and plunging won’t reach it.

On This Page

• Toilet Overflowing? Stop the Water First
• How to Unclog a Toilet With a Plunger
• How to Unclog a Toilet Without a Plunger
• When the Toilet Won’t Unclog: Signs It’s Past the Toilet
• Frequently Asked Questions
• Book Toilet and Drain Repair in San Jose and the South Bay

Toilet Overflowing? Stop the Water First

When a toilet won’t flush and the bowl keeps filling, you have a water problem before a clog problem. A toilet overflowing is the thing to prevent first.

• Lift the tank lid and press the rubber flapper down onto the drain opening. That stops more water entering the bowl immediately.
• Turn the shutoff valve on the wall behind the toilet clockwise until it stops. If it won’t turn, don’t force it; old valves crack.
• Lay towels around the base and put on rubber gloves before you start.
• If the bowl is full to the rim, bail some water into a bucket so plunging won’t splash it over.

If water is already on the floor and the valve won’t close, shut off the main water supply and follow the steps for handling a plumbing emergency before anything else.

How to Unclog a Toilet With a Plunger

A plunger works by pushing and pulling water against the clog, so the seal and the water level matter more than muscle.

• Use a flange plunger. The soft sleeve under the cup fits into the toilet’s drain opening; a flat sink plunger can’t seal there.
• Make sure water covers the rubber cup. Plunging air does nothing.
• Tilt the plunger in at an angle so the cup fills with water, then set it square over the opening.
• Push the first stroke down slowly to avoid a splash, then work it in and out firmly 10 to 15 times without breaking the seal.
• Pull up sharply on the last stroke. If the water drains away with a gulp, the clog has moved.

Test with a bucket of water poured into the bowl before you trust a full flush. If it drains, flush once with your hand on the tank lid, ready to drop the flapper. Give plunging three or four rounds before you move on. If it hasn’t budged by then, the clog is either too firm or too far down for a plunger.

How to Unclog a Toilet Without a Plunger

You can unclog a toilet without a plunger for most soft clogs. For anything solid, you need an auger.

Dish soap and hot water. Squirt a generous amount of dish soap into the bowl and let it sink for 10 to 15 minutes. It coats the clog and the trap so paper and waste slide. Then pour in a bucket of hot tap water from waist height. Use hot tap water, never boiling: boiling water can crack a porcelain bowl. Wait, then try a gentle flush with the flapper covered.

A toilet auger. Also called a closet auger, it has a short cable inside a curved tube with a rubber sleeve that protects the porcelain. Set the curved end in the drain opening, crank the cable forward until it stops, then turn and work it back and forth. It reaches the full length of the toilet’s built-in trap, which is where toys, cotton swabs and dense wads of paper get stuck. Don’t use a bare wire hanger or a sink snake; both scratch the bowl.

What not to use: chemical drain cleaner. Poison Control warns that caustic drain cleaners can cause serious burns, including when they splash back out of a drain. A clogged toilet is a bowl of standing water that will splash the moment you plunge it, and anyone who works on it afterwards has to deal with that chemical too.

b>When the Toilet Won’t Unclog: Signs It’s Past the Toilet

If a toilet won’t unclog after plunging and augering, look at the rest of the house before you try again.

What you see	Likely cause	Next move
Only this toilet is slow or blocked	A clog in the toilet trap	Plunge, then auger
Toilet clears, then clogs again within days	Something stuck in the trap, or wipes building up	Auger; stop flushing wipes
Tub or shower gurgles or backs up when you flush	Blockage in the main line	Stop using water and call a plumber
Several drains slow at once, or a sewer smell	Main sewer line or lateral	Camera inspection of the line

Gurgling from a tub, water rising in the shower when you flush, or several drains slowing at once are signs of a sewer line problem, not a toilet problem. Stop running water until it’s cleared. Many houses across San Jose, Santa Clara and Los Gatos were built between the 1950s and the 1990s, and their sewer laterals have had decades for tree roots and buildup to get in.

It also matters who owns the pipe. The City of San José’s sewer backup guidance puts the lateral on the property owner: if the blockage is in your lateral, calling a plumber to clear it is your responsibility.

A toilet that keeps clogging is usually telling you something. Often it’s an object lodged in the trap, sometimes a partly blocked line, and very often it’s wipes. The EPA asks Americans to flush only toilet paper, because wipes, including disinfecting wipes, can damage household plumbing, sewers and septic systems. If clogs keep coming back, a drain line camera inspection shows exactly what’s in the pipe and where.

Frequently Asked Questions

Will letting a clogged toilet sit unclog it?

Sometimes. A clog of toilet paper and waste can soften and clear on its own within a few hours, especially with dish soap added. Wipes, paper towels, a toy or anything else that doesn’t dissolve won’t clear by waiting. If the toilet is still blocked the next day, it needs a plunger or an auger.

Should I flush the toilet again if it’s clogged?

No. If the first flush didn’t drain, a second flush sends another full tank of water into a bowl that can’t empty, and that’s how a clog turns into a toilet overflowing onto the floor. Push the flapper down, turn the shutoff valve clockwise, and plunge before you flush again.

Why won’t my toilet unclog even with a plunger?

Usually one of three reasons: a flat sink plunger that can’t seal the opening, too little water in the bowl, or a clog that’s solid or past the toilet. Switch to a flange plunger and top up the water. If it still won’t clear, use a toilet auger, and if other drains gurgle, call a plumber.

Why does my toilet fill up with water, then slowly drain?

A bowl that rises and then drains slowly after a flush has a partial clog. Water is squeezing past the blockage, but not fast enough to carry waste away. It’s usually in the toilet’s own trap and clears with a plunger or auger. If the same toilet does it again within days, have the drain line checked.

Book Toilet and Drain Repair in San Jose and the South Bay

Stop the water, plunge properly, and use an auger for anything a plunger can’t shift. If the clog keeps coming back or other drains join in, it’s time for someone to look inside the line. Proper Hour Home Service handles plumbing and drain work seven days a week, 8 a.m. to 8 p.m., across San Jose, Santa Clara, Los Gatos, Fremont, San Mateo and San Bruno. Book a plumbing visit or use the call button at the top of the page.