When I do 3 or more loads of laundry and it is wet outside, the washer overflows at the connection between the drain and the pipe to the outside, also the utility tub fills with water and overflows, and the sump pump fills with water and overflows. My husband has snaked the drain twice with no success. We live in a 50 year old house that has city water and sewer. However, could there be an old drain feild the washer is draining into? Our washer is in the basement in the back of the house and the city water/sewer access is in the front of the house.