A sewer smell inside or around the house means sewer gas is escaping somewhere it should not. The most common causes are a dry drain trap, a failed toilet wax ring, a loose or cracked vent pipe, a broken drain line under the floor, or a leak in the sewer line outside. Finding the source takes a methodical check, often with a smoke test or camera, and most fixes are small once the cause is known.
Sewer gas is more than unpleasant. It can contain hydrogen sulfide, which gives the rotten egg smell, along with methane and other gases. A faint, on-and-off smell is a warning that the drain system is open to the house somewhere. Air fresheners hide it; they do not fix it. The good news is that most sewer smells come from simple, affordable problems.
Where the Smell Comes From
| Where you smell it | Common causes |
|---|---|
| One bathroom | Dry trap in an unused shower or sink, failed toilet wax ring, loose drain connection |
| Laundry room | Washer standpipe with no trap or a dry trap, drain hose pushed too far down |
| Whole house, comes and goes | Cracked or disconnected vent pipe in the attic or wall, failing cast iron under the slab |
| Kitchen | Dishwasher drain loop missing, garbage disposal buildup, dry trap |
| Outside near the house | Leaking sewer line, cracked cleanout cap, broken pipe in the yard |
| Crawlspace | Leaking or broken drain pipe under the floor |
Try These First
- Run water for 30 seconds in every sink, tub, shower and floor drain, especially ones nobody uses. That refills dry traps.
- Check that the outdoor cleanout cap is in place and not cracked.
- Rock each toilet gently. A toilet that moves may have a failed wax ring.
- Look under sinks for loose slip nuts or missing traps.
If the smell is still there after that, it is time for a proper diagnosis.
How We Track It Down
Walk-through
We ask where and when you smell it and check the obvious suspects: traps, toilets, vents, the cleanout.
Smoke test
A sewer smoke test fills the drain and vent system with harmless smoke that shows exactly where gas escapes.
Camera inspection
If the smell points to a broken line, a camera inspection finds the crack or break and its location.
Fix and confirm
You get the cause and the price, we make the repair, and the smell should be gone.
Sewer Smells in Older Pine Bluff Homes
Many homes here were built between the 1940s and the 1990s, and the 1950s and 1960s ranch houses often have cast iron drain lines under the slab or in the crawlspace. As that cast iron rusts, small cracks open and gas seeps into the house, often strongest in a hallway or bathroom. Older homes near Fifth Avenue and downtown sometimes have vent pipes that were altered during remodels and never properly reconnected. Both show up clearly on a smoke test. If the problem is cast iron under the floor, see cast iron sewer pipe replacement and under-slab repair.
Small Fixes That Solve Most Smells
Once we know the source, the repair is often quick. A dry floor drain can get a trap primer or a simple routine of adding water. A toilet with a failed wax ring gets pulled and reset on a new seal. A washer standpipe gets a proper trap. A vent pipe that came apart in the attic gets reconnected. These are small jobs, and knowing exactly which one you need keeps you from paying for guesswork. Bigger repairs, like replacing a cracked drain under the slab, only come up when the smoke test or camera points to them.
Smells Outside the House
A sewer smell in the yard, especially with a damp patch or extra-green grass, usually means a leaking sewer line. It can also come from a neighbor’s line or the city main after heavy rain, which is why we check before recommending any digging. Read why you smell sewer outside your house.
Finding the real cause first is how we approach all sewer line repair in Pine Bluff, and with smells it saves you from paying for the wrong fix.
Call and my crew will track it down with a smoke test or camera and price the fix before any work. 24/7.
Sewer Smell FAQ
Is sewer gas dangerous?
Low levels are mostly a nuisance, but sewer gas can contain hydrogen sulfide and methane. A strong or constant smell should be fixed promptly.
Why does the smell come and go?
Wind across roof vents, changes in air pressure, and when water is running all affect how much gas escapes, so intermittent smells are common with vent or trap problems.
Why do I smell sewer gas in my house?
Read our full guide on why you smell sewer gas in your house.