How to Get Rid of Sewer Smells in Your Home (Columbia, Lexington, Irmo SC )
Stephanie Carwell - 02/23/2026
There are few things more unpleasant than walking into your bathroom or kitchen and smelling sewage.
If you’re noticing a sewer smell in your home in Columbia, Lexington, or Irmo, it’s not something you should ignore. Sewer odors are often early warning signs of plumbing issues that can escalate quickly.
The good news? Many causes are simple to fix — but some require professional inspection.
Let’s break down what causes sewer smells and how to get rid of them safely.
Why Does My House Smell Like Sewage?
Sewer smells usually come from one of five main sources:
- Dry P-traps
- Clogged or dirty drains
- Broken or loose toilet seals
- Cracked sewer lines
- Blocked plumbing vent pipes
Identifying the source is key to solving the problem permanently.
1. Check for a Dry P-Trap (Most Common Cause)
Every sink, tub, and shower drain has a curved pipe underneath called a P-trap. It holds water to block sewer gases from entering your home.
If a drain hasn’t been used in a while, the water can evaporate — allowing sewer gas to escape.
How to Fix It:
Simply run water in the drain for 30–60 seconds to refill the trap.
This is common in:
- Guest bathrooms
- Floor drains
- Laundry rooms
- Unused showers
If the smell disappears after running water, you’ve found your culprit.
2. Clean Out Dirty or Sludge-Filled Drains
Sometimes the smell isn’t coming from the sewer — it’s coming from organic buildup inside the drain itself.
Hair, soap scum, grease, and bacteria can create a foul odor that mimics sewer gas.
Try This:
- Remove visible debris from drain covers
- Flush with hot water
- Use a baking soda + vinegar flush
- Avoid harsh chemical drain cleaners/li>
If the smell persists, you may need professional drain cleaning service in Columbia or Lexington to fully clear buildup inside the line.
3. Inspect the Toilet Wax Ring
If the sewer smell is strongest near your toilet, the wax ring seal at the base may have failed.
When this seal breaks:
- Sewer gas escapes
- You may notice slight rocking of the toilet
- There may be moisture around the base
This issue requires removal and resealing of the toilet to properly fix.
4. Sewer Line Issues (More Serious)
If the smell is:
- Strong throughout the house
- Accompanied by slow drains
- Causing gurgling sounds
- Coming from multiple fixtures
You may have a main sewer line problem.
Common sewer line issues in Richland and Lexington County include:
- Tree root intrusion
- Pipe collapse
- Aging clay or cast iron pipes
- Shifting soil damage
In these cases, a professional camera inspection is the safest way to diagnose the problem.
If you suspect this type of issue, Freedom Plumbing Inc. can be reached at (803) 447-0471 for inspection services.
5. Blocked Plumbing Vent Pipes
Your plumbing system includes vent pipes that exit through your roof. These allow sewer gases to escape safely outdoors.
If vents become blocked by:
- Leaves
- Bird nests
- Debris
Pressure imbalances can push sewer smells back into your home.
This is especially common after storms in Lexington and Columbia.
Clearing vents should be done carefully and safely — often by a professional.
When Sewer Smells Are an Emergency
Call immediately if sewer smells are combined with:
- Water backing up into tubs or showers
- Multiple drains clogged at once
- Sewage visible in fixtures
- Water pooling in yard
These signs may indicate a sewer line blockage that needs immediate attention.
Freedom Plumbing Inc. serves Columbia, Lexington, Irmo, Chapin, West Columbia, and Cayce.
Call (803) 447-0471 if sewer odors are worsening or causing backups.
Preventing Sewer Smells Long-Term
Here are practical steps homeowners can take:
- Run water in unused drains monthly
- Avoid pouring grease down sinks
- Install drain strainers
- Schedule routine drain maintenance
- Address slow drains early
Preventative plumbing maintenance can eliminate most odor issues before they escalate.
Final Thoughts
Sewer smells are never “normal.”
Sometimes the fix is simple — like refilling a dry P-trap. Other times, it signals a deeper plumbing issue that requires professional attention.
If you’re unsure where the odor is coming from, or if it keeps returning, it’s worth having your plumbing system inspected.
Freedom Plumbing Inc. proudly serves homeowners across Richland and Lexington County with honest diagnostics and long-term plumbing solutions.
Call (803) 447-0471 if you need help identifying or eliminating sewer smells in your home.
Frequently Asked Questions About Sewer Smells
Why does my house suddenly smell like sewer in Columbia, SC?
A sudden sewer smell is often caused by a dry P-trap, a clogged drain, a broken toilet wax ring, or a blocked plumbing vent pipe. In Columbia homes, tree root intrusion and aging sewer lines can also cause sewer gas odors. If the smell is strong throughout the house or combined with slow drains, a professional inspection may be necessary.
Is sewer smell in my house dangerous?
Sewer gas contains methane and hydrogen sulfide. In small amounts, it’s mostly unpleasant — but strong or prolonged exposure can cause headaches, dizziness, and nausea. More importantly, sewer smells often signal plumbing problems that can lead to water damage or sewage backups if ignored.
How do I get rid of sewer smell in my bathroom?
Start by running water in the sink and shower to refill the P-trap. Next, clean the drain to remove organic buildup. If the smell remains strongest near the toilet, the wax ring seal may need replacement. Persistent odors may require professional drain cleaning or sewer line inspection.
Why does my house smell like sewage when it rains?
Heavy rain in Lexington and Columbia can overload municipal sewer systems or saturate soil around aging pipes. This can push sewer gas back through drains, especially if vent pipes are partially blocked. Storm-related sewer smells should be inspected if they happen repeatedly.
Can clogged drains cause sewer smells?
Yes. Clogged or partially blocked drains trap bacteria, grease, and debris that create foul odors. If multiple drains smell at once, it could indicate a deeper sewer line blockage.