A Basement that Smells like a Sewer or Septic Tank


If your basement smells like a sewer or a septic tank, you have more trouble than not being able to entertain in that room. Your home could have dangerous gas building up inside of it.


  • The sewer smell in your basement is most likely coming from a drain in the floor. If the trap below that drain dries out, gas from the sewer or your septic tank can vent backwards and enter your home, according to the University of Minnesota.


  • Sewer gas in your basement does more than smell bad. It can cause hydrogen sulfide poisoning, which leads to health problems like nausea, dizziness and headache. Sewer gas contains methane. Methane and hydrogen sulfide are both flammable and can cause explosions in your home, according to the Wisconsin Department of Health Services.


  • You can stop the sewer gas from entering your basement by filling the trap with water, which blocks the gas. Fill the drain with water at regular intervals to prevent the trap from drying out again. If the septic tank odor lingers, contact a plumbing professional to discover where else the problem could be located.

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