Toilet Keeps Clogging: Causes and When to Call a Plumber

What are the 5 causes of a toilet that keeps clogging?

The 5 causes of a toilet that keeps clogging are listed below.

• An older low-flow toilet flushes with too little force.
• A partial clog stays in the trapway after plunging.
• Wipes and paper towels block the drain line.
• A blocked vent weakens every flush.
• A main sewer line clog slows every toilet in the house.

Does a toilet that keeps clogging need replacement?

No, a toilet that keeps clogging needs replacement only when the bowl or trapway is the cause, and a plumber checks the drain and the vent first.

What should you do when a toilet keeps clogging?

The 4 things you should do when a toilet keeps clogging are listed below.

1. Plunge with a flange plunger.
2. Stop flushing wipes and paper towels.
3. Check whether other drains are slow.
4. Call a plumber when the clog returns within a week.

When should you call a plumber?

You should call a plumber in the 4 situations below.

• The toilet clogs every week.
• Other drains gurgle when the toilet flushes.
• Water backs up into the tub.
• Plunging no longer clears the clog.

Related plumbing problems and next steps

How much does the plumbing repair cost?

The plumbing repair cost depends on the cause: drain cleaning costs $147–$345, and toilet installation costs $224–$533, according to HomeAdvisor. Drain cleaning prices and local plumbers are on the drain cleaning in the Lancaster area page.

What is a related plumbing problem?

A related plumbing problem is main sewer line clogged symptoms, and the main sewer line clogged symptoms causes and first steps lists its causes and first steps.

Written and fact-checked by the Lancaster PA Plumbers editorial team using HomeAdvisor, EPA WaterSense and City of Lancaster data. Last updated October 29, 2026.