Sewer Smell in the Basement
Why do I have a sewer smell in the basement? There are a few possible reasons that we will go over on why your basement may have a sewer smell. The sewer smell in the basement typically comes from a floor drain however there are a few other reasons that you have a sewer smell in your basement. Sewer smell does contain high levels of methane gas which under the right circumstances can be explosive and generally unhealthy for you and your family. You should contact a plumber if you can not locate the sewer smell in the basement.
Smell in the Basement From the Floor Drain
This is the first place to look for a sewer smell in the basement. You should have a floor drain (by building code) located in your basement some where, typically the floor drain is located in the furnace room. The floor drain has a P-trap on it. Just like the P-trap on your sink. The P-trap holds a certain amount of water in it.This stops sewer smell from coming through the floor drain. What can happen is the P-trap on the floor drain can loose the water in it and let the sewer smell escape in to the basement.
-An easy way to fix the sewer smell is to just pour water down the floor drain on a monthly basis, or whenever you notice the smell.
-The right way to fix the sewer smell is to run a condensation line over to the floor drain from the furnace. The condensation drain from the furnace will keep a constant stream of water going in to the floor drain. This will keep the sewer smell in the basement away because it will keep the P-trap full.
See Bathroom Plumbing Drains in Basements.
Smell in the Basement Coming From Clean Out
Another reason you will get a sewer smell in the basement is through a clean out. Clean outs are installed in your homes plumbing drain system to provide access for cleaning or inspecting. You will have a clean out located where your main plumbing drain comes through the concrete. What happens is either this clean out is not threaded all the way in or the gasket on it has become deteriorated. Locate all your clean outs in your plumbing drains.
Sewer Smell in the Basement Coming from Sewage Pit
Not all basement have a sewage pit. A sewage pit has a cover on it with screws and a gasket. Over time this gasket will become deteriorated. Take the screws off the sewage lid and check to see if the gasket has become deteriorated. You will be able to tell if it the gasket is brittle or sometimes is pretty obvious that it could not keep out an odor.
-An easy way to fix this is to silicone the lid back down
-The right way to fix it is to get a closed cell gasket and replace the old one.
Smell in the Basement Coming from Hole in Vent
When people hang pictures on walls or drill through walls to hang anything from time to time they drill through a plumbing vent. Even a small hole can give a sewer smell in the basement. This is a very tough problem to locate. If you have hung anything on your walls or drilled through your walls lately, than you could have drilled in to a plumbing vent or a plumbing drain and this is the reason you have a sewer smell in the basement.