I have lived in my two story house for 4 years. Every spring I start smelling an odor in my 2nd floor. It smells like sewage I think. I am on a septic system that was inspected and passed 4 years ago. I had the tank pumped in the summer of 2008, and visually inspected, everything was good. I thought it was the traps under the double sink in the kitchen so I plugged both sinks for the entire afternoon and evening, still stinks! It actually gets worse when I open the windows. The vent goes through the roof by a kitchen window that we don't open. The smell is very rare in the winter months. I want to be clear on one point, the smell is also prevelant when the windows are closed. Please help!!
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