Toilet Backups: Common Causes and Sewer vs. Drain Signs When a toilet keeps backing up, it can be frightening and inconvenient. The most common causes are blockages or plumbing issues within your home’s drain system, but in some cases the problem originates outside—at the sewer main—meaning it’s handled differently than typical household clogs. Below are the most frequent reasons toilets back up, plus clear indicators that the issue may be a sewer problem rather than an internal drain blockage. Common reasons a toilet keeps backing up Toilet backups often happen when wastewater can’t flow away fast enough or gets trapped somewhere in the drainage path. Common culprits include partial clogs and debris buildup in the toilet trap, the toilet flange area, or the line that carries waste to the main drain. Items that don’t break down easily—such as wipes labeled “flushable,” feminine hygiene prod ... Read more »

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