Bathroom Sink Smells Only When Water Runs

Bathroom Sink Smells Only When Water Runs: Uncover the Causes and Solutions

A foul odor emanating from your bathroom sink every time you turn on the water can be an unpleasant and puzzling experience. While the smell may not be present when the water is off, it becomes noticeable as soon as the faucet is turned on. This phenomenon can be attributed to several factors, each with specific solutions to eliminate the odor effectively.

1. Clogged Drain

A clogged drain is a common culprit behind sink odors, especially when water is running. Hair, soap scum, and other debris can accumulate in the drainpipe, creating a breeding ground for bacteria and mold. This buildup can release unpleasant odors when water flows through the pipes.

Solution:

* Remove the drain stopper and clean it thoroughly. * Use a drain cleaner or a baking soda and vinegar solution to dissolve the clog. * For persistent clogs, consider using a drain snake to remove the debris.

2. P-Trap Issues

The P-trap is a U-shaped pipe beneath the sink that prevents sewer gases from entering the bathroom. If the P-trap is not properly sealed or has become damaged, sewer gases can leak into the sink, causing an unpleasant smell.

Solution:

* Check the P-trap for any loose connections or cracks. * Tighten any loose fittings or replace the P-trap if necessary. * Ensure that the P-trap is always filled with water to maintain the seal.

3. Dry Vent

A dry vent is a pipe that extends from the vent stack on the roof to the fixture drain. It allows air to circulate in the plumbing system and prevents the development of negative pressure. If the dry vent becomes clogged or blocked, it can cause the drain to pull air from the sewer, resulting in an odor.

Solution:

* Inspect the dry vent for obstructions. * Remove any debris or blockages that may be preventing airflow. * Ensure that the dry vent is properly sized and connected to the plumbing system.

4. Damaged Washer

The washer is a rubber gasket located at the base of the faucet handle. Over time, the washer can become worn or damaged, allowing water to leak. This leaking water can create a moist environment that attracts bacteria and mold, leading to foul odors.

Solution:

* Replace the damaged washer with a new one. * Make sure that the washer is properly installed to prevent future leaks.

5. Aerator Blockage

The aerator is a small screen attached to the faucet spout that helps mix air into the water stream. When the aerator becomes clogged with mineral deposits or debris, it can restrict water flow and create a foul odor.

Solution:

* Remove the aerator and clean it with a vinegar solution or a pipe cleaner. * If the aerator is severely damaged, consider replacing it with a new one.