Why Is There A Sewage Smell In Your Bathroom? | HowStuffWorks

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If your bathroom smells like sewage, it could be due to a few common issues.

1. Clogged Drain

The buildup of hair, soap scum or other debris in the drains can cause blockages. These clogs trap moisture, creating a breeding ground for bacteria that can emit foul, sewage-like odors.

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2. Dry P-Trap

The P-trap, a U-shaped pipe beneath sinks and drains, holds water and prevent sewer gases from entering the bathroom. If it dries out (e.g., in unused sinks or shower drains), the barrier disappears, allowing sewage smells to seep through.

3. Vent Pipe Blockage

Vent pipes allow sewer gases to escape outside your house. If leaves, debris or even animal nests block the vent pipe, it can force the gases back into your bathroom.

4. Leaky or Damaged Pipes

Cracks or leaks in pipes can release sewer gases into the bathroom. If there’s a hidden leak under the floor or behind the walls, the smell may worsen over time as gases escape through the damaged areas.

5. Toilet Seal Problems

The wax seal beneath the toilet connects it to the sewer line and prevents gases from seeping into the bathroom. A worn-out or improperly installed wax ring can lead to leaks and allow unpleasant odors into the room.

6. Sewer Line Issues

In more severe cases, a broken or blocked main sewer line could cause a backup that results in sewer odors throughout the bathroom. This may also cause issues in other drains in the home.

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