what causes sewer gas smell in my house
Dried Drain TrapsâWater Seal Evaporation. As perhaps the most common cause of sewer odor in a house, it is also one of the simplest to remedy. As with a clogged or blocked air vent, the problem is an emptied or dried drain trap. Unlike a clogged air vent, instead of the water seal being siphoned out of the trap, it simply evaporates.