House Traps are Largely Prohibited

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House traps were once common but are now largely prohibited.

You can only install one if your municipal jurisdication Code Office allows it.

While a house trap "may" prevent sewer gases from leaking into the house, sewer odors can still occur if there is a break in a plumbing vent even with a house trap.

If allowed, a house trap installed on the building drain immediately before it exits the foundation would be an inexpensive first step to solving the odor problem.