Bathroom Sink Smells Like Sewer

Bathroom Sink Smells Like Sewer: Causes and Solutions

A foul odor emanating from your bathroom sink can be both unpleasant and alarming. If you're experiencing this issue, it's essential to identify the underlying cause and take prompt action to resolve it.

1. Clogged Drain: A buildup of hair, soap scum, and other debris in your sink drain can create a foul odor. Run hot water down the drain and use a drain snake or chemical drain cleaner to clear the obstruction.

2. P-Trap Issue: The P-trap is the curved pipe below your sink that holds water to prevent sewer gases from entering your home. If it becomes clogged or leaks, sewer odors can escape. Check the P-trap for cracks or leaks and replace it if necessary.

3. Gas Trap Absence: Some sinks have a gas trap installed to prevent sewer gas from backing up into the sink. If your sink does not have one, consider installing a trap to reduce odors.

4. Damaged Sewer Line: In rare cases, the sewer line that drains your sink may be damaged, allowing sewer gases to escape. Contact a plumber to inspect and repair the sewer line if you suspect this issue.

5. Dry Vent Problem: A dry vent is a pipe that allows sewer gases to escape from the roof. If the dry vent is clogged or blocked, sewer odors can accumulate in the bathroom. Ensure that the dry vent is clear and functioning properly.

6. Bacterial Buildup: Bacteria can grow and accumulate in the sink drain and P-trap, especially if the sink is not regularly cleaned. This can lead to a foul odor. Clean the drain and P-trap regularly with a disinfectant to prevent bacterial buildup.

If the odor persists despite addressing the above causes, it's advisable to contact a professional plumber. They can diagnose the exact issue and provide an effective solution.