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Septic smell in house, but not at septic tank / lines

Heavy rains lately. Septic smell is very strong in the bathroom, but no smell at all in yard where the tank is or where the field lines are. No signs of standing water or anything odd-looking in yard at septic tank / field line locations.

Septic tank vent pipe is near bathroom window; pipe terminates 3 feet above window. Window does not seal shut; it is old and has failed.

Could the septic smell be a downdraft from the vent? The toilet trap is full right now.

Another oddity: toilet trap drains dry after heavy rain leaves.

How to prevent the septic smell from entering my house?

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