What Is That Awful Smell?
- headaches
- vomiting
- trouble breathing
- loss of memory
- lack of concentration
- loss of smell (the smell will appear to go away)
- eye irritation
- lung irritation
- seizures
- coma
If your basement smells like sewer, it could be due to multiple causes.
Most of the solutions to these problems can be done yourself. If they do need professional help, you can call us at New Flow Plumbing.
Where Can That Awful Smell be Coming From? How To Fix It
- Dried-out water trap
They also exist under basement floor drains and laundry tubs. If left unused they can dry up and eventually evaporate. That’s when you smell that odor.

A U or S-shaped pipe keeps a small amount of water to prevent sewer gas from entering the home.
- Missing cleanout plug
- Toilet trap
- Toilet wax ring seal
Where the toilet meets the floor is a connection called a toilet flange, and that connects to the drainpipe. Between the toilet and the flange, there’s a wax ring seal. If this seal is not tight and your toilet is wobbling, sewer gas can enter your home. If you have a bathroom in the basement, this can be the source of that awful stench. The seal can even dry out and cause the issue.

The toilet wax ring needs to be sealed otherwise smell can enter your house or basement.
- Ejector pit(call us)
What is an ejector pit? Inside your basement, you may have a bathroom or laundry room with an ejector pump. Sewer systems use gravity and the basement needs a pump to reach the sewer line. So the ejector pump helps waste go where it needs to go. The ejector pit (also called a sump basin) is where the pump is located and needs to be properly sealed and vented. If anything looks broken or cracked, that’s where the sewer gas is entering from.
Ejector pit (also called a sump pump) is where the ejector pump is located. This could be where the sewer odor is coming from.
If the seal is secure and the pit is vented, the issue may be an actual component. Something is either damaged or missing. This particular issue may require professional help, which again we are here to offer.
Read more about: How To Get Rid Of Smelly Drains
If That Doesn’t Work: Trenchless Sewer Repair
Whatever the issue is, if you need help, we are gladly willing to offer our services here.

Let’s eliminate that basement sewer smell.

Arman Grigoryan
Founder & President of New Flow Pumbing
Arman Grigoryan is the founder and president of New Flow Plumbing, proudly serving Los Angeles, Sacramento, and surrounding areas. With extensive experience in plumbing diagnostics, he leads a skilled team specializing in advanced sewer and drain camera inspections to quickly identify problems and deliver lasting solutions. Arman is dedicated to using the latest technology to provide reliable service, honest answers, and dependable results for every customer.