Bathroom Sink Smells Bad When Water Runs

Bathroom Sink Smells Bad When Water Runs? Here's Why and How to Fix it

A foul odor emanating from your bathroom sink when water runs can be an unpleasant experience. Fortunately, identifying the underlying cause and implementing appropriate solutions can effectively eliminate the problem. Here are some common reasons why your bathroom sink may smell bad when water runs and simple steps you can take to resolve the issue:

### Clogged Drain

A clogged drain is a prevalent cause of unpleasant sink odors. Hair, soap scum, toothpaste, and other debris can accumulate over time, creating an obstruction that hinders proper water flow. This buildup can trap bacteria, leading to a foul smell when water is turned on.

Solution:

1. Use a drain snake or chemical drain cleaner to remove the clog. 2. Regularly clean the drain with a drain cleaner or vinegar and baking soda to prevent future clogs. 3. Install a drain strainer to catch hair and other debris. ### Dry P-Trap

The P-trap is a U-shaped pipe underneath the sink that holds water to prevent sewer gases from entering your home. If the P-trap becomes dry, such as due to infrequent water usage or evaporation during a vacation, it can allow sewer gases to escape and result in a bad odor.

Solution:

1. Run water through the sink for several minutes to fill the P-trap. 2. If the odor persists, check for leaks in the P-trap or its connections and tighten any loose fittings. ### Bacterial Buildup

Bacteria can accumulate in the sink drain, faucet, and pipes, especially if the sink is not cleaned regularly. This bacterial buildup can release unpleasant odors when water flows through the system.

Solution:

1. Clean the sink drain, faucet, and pipes with a disinfectant or bleach solution. 2. Use a sink deodorizer or pour baking soda down the drain to neutralize odors. 3. Regularly clean the sink and surrounding area to prevent bacterial growth. ### Improperly Installed Vent Pipe

A vent pipe allows sewer gases to escape from the drainage system. If the vent pipe is not installed correctly or becomes blocked, sewer gases can back up into your sink and create a foul odor.

Solution:

1. Contact a licensed plumber to inspect the vent pipe and ensure it is properly installed. 2. Clean or replace any blocked vent pipe to restore proper air circulation. ### Corroded Pipes

Corroded pipes, especially galvanized steel pipes, can release a metallic odor when water flows through them. This odor can be particularly noticeable when the water has been stagnant for a while.

Solution:

1. Replace the corroded pipes with copper or PVC pipes, which are less prone to corrosion. 2. Use a corrosion inhibitor to slow down the corrosion process in existing pipes.