Nothing ruins a refreshing shower faster than a foul odor. If your shower drain smells like rotten eggs, it’s not just unpleasant—it’s a sign of an underlying plumbing or water issue. From dry P-traps to sulfur-rich water, several causes can make your bathroom smell like sulfur or rotten eggs. You May Also Like: Irrigation Repair.

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This guide will explain why your shower smells like rotten eggs, common causes behind the odor, and most importantly—what to do when your shower drain smells like rotten eggs.

Understanding the Rotten Egg Smell in Your Shower

That “rotten egg” odor is usually linked to hydrogen sulfide gas (H₂S), which smells like sulfur. Depending on the cause, the odor may come from:

• The drain (bacteria, clogs, or P-trap issues)
• The plumbing system (vent blockages, cracked pipes)
• The water supply (sulfur in well water or corroded water heater anode rod)

Identifying the source is the first step before applying a solution.

Common Causes of a Shower Drain That Smells Like Rotten Eggs

1. Dry or Faulty P-Trap

The P-trap is a U-shaped pipe under your shower drain that holds water to block sewer gases. If it dries out (common in guest bathrooms), those gases escape, causing a sulfur smell.

Fix: Run the shower for a few minutes to refill the trap. If unused often, pour a little mineral oil on top of the water in the trap to slow evaporation.

2. Biofilm Buildup

Shower drains collect hair, soap scum, skin cells, and oils. Over time, bacteria feed on this organic matter and form a slimy coating called biofilm. As it decomposes, it releases a rotten egg odor.

Fix:

1. Pour ½ cup of baking soda down the drain.
2. Add 1 cup of vinegar and let it fizz for 10–15 minutes.
3. Flush with boiling water.
4. Use a drain brush to scrub remaining debris.

3. Clogged or Blocked Vent Pipes

Plumbing systems rely on vent pipes (often leading out of the roof) to equalize pressure. If they’re blocked by debris, leaves, or even animal nests, a vacuum forms that sucks water from the P-trap—letting sewer gases in.

Fix: Use a plumber’s snake to clear blockages or call a professional if roof access is tricky.

4. Cracked or Damaged Drain Pipes

Older pipes (especially cast iron or PVC joints) can crack. This lets sewer gases seep into your home. The smell might seem like it’s from the shower drain but actually comes from under the tub.

Fix: Replace the cracked section with new piping and seal joints properly. Severe damage may require professional repair.

5. Sulfur in the Water Supply

If your shower smells like sulfur even when water is running, the issue may be in your water itself. Homes with well water are especially prone to hydrogen sulfide gas in underground water sources.

Fix:

• Shock chlorinate your well system (temporary solution, lasts 1–2 months).
• Install a whole house water filtration system for a long-term solution.

6. Corroded Water Heater Anode Rod

Water heaters have a sacrificial anode rod that prevents tank corrosion. But when it breaks down, it reacts with sulfur bacteria and creates that eggy smell—especially in hot showers.

Fix: Replace the anode rod. If the water heater is too old or corroded, consider replacing the unit.

How to Prevent Rotten Egg Smells in Your Shower

• Run water in rarely used bathrooms every 1–2 weeks.
• Clean drains monthly with baking soda and vinegar.
• Install a drain cover to catch hair and debris.
• Schedule annual plumbing inspections.
• Treat well water with filters or softeners if sulfur levels are high.

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FAQs About Shower Drains Smelling Like Rotten Eggs

What causes my shower drain to smell like rotten eggs?

The smell is usually from sewer gases, biofilm, or sulfur in water. Common culprits include dry P-traps, bacteria buildup, or plumbing vent issues.

How do I get rid of the rotten egg smell in my shower?

Start by cleaning the drain with baking soda and vinegar. If the smell persists, check for dry traps, clogged vents, or sulfur in your water supply.

Why does my shower smell like sulfur only when using hot water?

This is often caused by a corroded water heater anode rod reacting with sulfur bacteria. Replacing the rod usually solves the problem.

Can rotten egg smells in drains be dangerous?

Yes. Sewer gases like hydrogen sulfide are not just smelly but can be harmful in high concentrations. Always address the issue promptly.

Should I call a plumber if my shower smells like rotten eggs?

If DIY methods don’t solve it, yes. Persistent odors may mean damaged pipes, vent issues, or contaminated water, all requiring professional repair.