Septic odor through the drain, is not possible with a properly designed and vented drain waste system. This explains your contractor's approach to caulk the space around the toilet. Odors are prevented from entering the house by water filled traps, P-traps, S-traps etc. If septic odor is being observed, it is comming from a failed vent system that allows the trap to empty, or a breach in the vent piping or drain piping, perhaps even in the wall. A septic tank must be properly vented. A plumber or septic tank company can inspect your system to verify proper installation and venting.
People can also confuse sulfur odors contained most often in well-water with septic odor. If you use a groundwater source, the water is poorly aerated and may contain sulfur that causes an odor problem. Do you use a well? Have any neighbors complained of similar odors? You may need to look into water treatment approaches to eliminate iron and sulfur from groundwater. |
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