A foul odor in your basement may be coming from your drains. When the water dries out in the trap, it allows gases to enter your basement and creates a bad smell. A simple solution is to add some water to your drain periodically. If the odor continues, add olive oil to slow down the evaporation process. Olive oil floats on top of the water thus keeping the water contained for a longer period of time. We at Putman and Sons care about our customers and will continue to share valuable tips we have learned throughout the years. If you have a question, please post on our social media so we can include your concern and provide an answer or solution