The most common cause of “sewer gas” odor in basements is due to improperly maintained floor drains. The floor drains in the basements are designed to “trap” the hydrogen sulfide gas in the sewer and away from your basement. How to remedy the problem-locate all of the floor drains in your basement. Pour at least one quart of water in each floor drain on a weekly basis.
When oil or grease is discharged into a sewer system, they will solidify and, after a while, they can build up and plugs drain lines in your building or complex. They can also plug sewer lines owned by the Authority, thus increasing the maintenance cost to the Authority. Plugged sewers can cause flooding of nearby private homes and businesses.