Broken, Clogged or Poorly Installed Vent PipesnWhen it gets clogged, the sewer gases can back up into the sinks and the toilet, resulting in your bathroom's sewage smells. You may experience a bubbling sound coming from the toilet or the drain as sewer gas forces its way into the bathroom.Mar 8, 2021,
When there is a broken seal – or the lack of a seal – in the caulk or wax ring around your toilet, it means water, urine and other waste find their way through the crevices, allowing bacteria to grow. This bacterium then causes the foul odor you detected.
If your toilet smells like sewage, it could have a broken or loose seal. The toilet attaches to the drain through two different seals. If these seals are loose, broken or improperly installed, they could allow sewer gases to enter your bathroom.May 28, 2019
Add one cup of baking soda to the clogged toilet or slow drain, then wait a few minutes. Follow with two cups of vinegar. Listen for bubbling and sizzling noises to indicate that the mixture is working. Wait another couple of minutes before either flushing the toilet or running water down the drain.