Why Does My Bathroom Sink Drain Smell?

If your bathroom sink drain has a lingering odor that won’t go away, there may be more going on than meets the eye. At Baldwin Cooling, Heating, Plumbing & Electrical, we’re here to help you uncover what might be causing the unpleasant smell and what you can do about it.

Common Causes of Bathroom Sink Drain Odors

Here are some of the most common reasons for sink drain smells and how they develop:

1. Clogged Drain

Clogs often form from a buildup of hair, soap, and other debris that accumulate in the pipes. Over time, this matter starts to decompose, causing a sewage-like odor. Clogs can also obstruct proper venting, allowing sewer gases to escape through the drain.

2. Dry P-Trap

The P-trap is a “P”-shaped pipe located under your sink, designed to hold water that acts as a barrier to keep sewer gases from coming up the pipes. If your sink isn’t used frequently, the water in the P-trap can evaporate, leaving it dry and allowing odors to escape.

3. Biofilm Buildup

Biofilm is a slimy buildup of bacteria that collects on surfaces inside your pipes. Often pink or orange, this scummy layer can produce foul odors when it builds up in sink drains. Regular cleaning is key to keeping biofilm in check.

4. Leaking Pipe

A leaking drain pipe can cause foul odors to escape into your bathroom. In addition to creating unpleasant smells, leaks allow wastewater to seep into surrounding walls and floors, potentially causing damage. Leaks can result from wear and tear, corrosion, or improper installation, and they require professional repair.

How to Clean a Smelly Bathroom Sink Drain

Depending on the cause, you may be able to address the odor with some simple DIY techniques:

• For Clogs: Try using a sink plunger or drain snake to physically remove blockages without the need for harsh chemicals. Removing clogs can eliminate odors and improve drainage.
• For a Dry P-Trap: If the sink is rarely used, run the faucet to refill the P-trap. This will restore the water barrier and block sewer gases from entering the bathroom.
• For Biofilm: Scrub away visible biofilm buildup and establish a regular cleaning routine for your sink to prevent this issue from recurring.

When to Call a Professional

If you’ve tried these DIY methods and the odor persists, it may be time to contact a plumber. Baldwin Cooling, Heating, Plumbing & Electrical offers comprehensive plumbing services, including drain cleaning and repair, to get rid of unpleasant smells and restore fresh air to your bathroom.

Contact us today to schedule an appointment and let our team handle your plumbing needs.