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What causes sewer gas oder in a certain part of the house?
Changed studor vent,checked septic tank it was ok, changed cummode seal,checked 2 roof air vents they were ok,checked cleanouts they were not backed up,cleaned p-trap under sink,cleaned p-trap in upstairs,can’t figure had a plummer to come check it out he doesn’t know need help?
If the smell is noticeable mainly around a sink, try flushing a strong cleaner and bleach down the sink’s overflow-the small hole(s) inside the bowl near the rim. When the sink fills to near overflowing, water is routed through an inner chamber to the drain. Debris can collect inside the inner chamber, causing odor.
If neither of these measures solves the problem, there may be a small leak in one of the vent lines of the plumbing system, or a small leak around the base of a toilet or other fixture. Check for loose fittings, corrosion, or holes in vent piping. Also, check the top side of horizontal drain pipes. If the top is rusted, it may never leak liquid, but it will leak sewer gas. Drain lines made of copper, steel or cast iron may all exhibit this problem.
When urine and sewer smells persist near a toilet despite careful cleaning, there could be an air leak at the wax ring of the toilet or in the vent pipe. Rotted or damp wood can also cause the smell.
Check to see if the toilet is tightly sealed to the floor. Grab the bowl of the toilet and try to slide it from side to side. It should resist a few pounds of pressure. If the toilet rocks from side to side, the wax ring has failed.
Other than this, perhaps this web page might offer some thoughts as to the source:
http://www.inspect-ny.com/septic/SewerOdors.htm
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