At the rear of my house is the kitchen it has a wooden floor then a 2 foot drop then a concrete slab same of the rest of the house except under the stairs at the front of the house it’s just clay which is really wet. Now water comes in from somewhere under the slab in the kitchen makes its way to the front of the house wear the stairs are 20 feet to the front door. I put a sump pump under the stairs which helps a bit but still wet and a bad odour up stairs also in the front bedroom smell really bad think it travels up the cavity. I don’t know if the hole house has waster under it because of the concrete slabs. My neighbours don’t seem to have a problem. Untied utilities say it’s ground water/ table water as I have no leaks.