What Causes Sewer Odor in the House?

If you’re noticing a strong sewer smell inside your home, you’re not alone — and you’re not imagining things. Sewer odors are a common issue in homes across Troy, Dayton, and the Miami Valley, and they can come from a few different plumbing problems.

At CPR – Complete Pipe Repair, we help homeowners get to the root of the issue and eliminate odors for good. Here’s what might be causing the smell and what you can do about it.

1. Dry or Blocked Drain Traps

Every sink and drain in your home has a curved pipe called a “P-trap” that holds water. This water barrier prevents gases from rising back into the house. If the trap dries out or gets blocked, that gas has a clear path.

Regularly run water in unused sinks, tubs, or basement drains to keep the trap full.

2. Cracked or Damaged Sewer Lines

A more serious cause of sewer odor is a cracked, leaking, or broken sewer pipe beneath your home. When wastewater escapes the pipe, it can release methane and other gases into your living space.

We use video pipe inspection to find the source without digging.

3. Root Intrusion or Blockages

Tree roots or years of buildup can block your sewer line and push odors back into your home. This is especially common in older homes around Greenville, Piqua, and Dayton.

Our hydrojet cleaning service removes clogs, grease, and roots fast, without harsh chemicals.

4. Faulty Venting

Your home’s plumbing system is vented to the roof to allow gases to escape. If the vent pipe is blocked or damaged, it can force odors back inside.

Sometimes, we may recommend a local plumber or HVAC specialist to adjust or repair your venting system.

5. Sewer Line Collapse

If part of your main line has collapsed or shifted, it can create pressure problems and allow odors to escape through the soil or foundation.

We often resolve these issues with trenchless sewer repair or CIPP lining, which restores the line without tearing up your yard.

Don’t Mask the Smell — Fix the Source

Air fresheners and bleach will not solve the real issue. If you smell sewage in your home, it’s time to have your system inspected by a professional.

Contact CPR or call (937) 703-1811 to schedule an inspection anywhere in the Miami Valley. We’ll find the source of the smell and fix it right.