Bruce, my guess would be that the main problem is outside the house and the water from the roof is not being routed away from the house. Also, the outflow pipes may be clogged with roots or other crud that is not letting the water from the sump pump run away from the house. There is also the possibility that the house could have been built over a spring or the water table has risen but these are a lot more remote. The first thing to do is just walk around the outside and be sure that the ground slopes away from the foundation and your downspouts get the rain water at least a foot or 2 away from the house. Also, look to see if you are not sitting in a valley and that other new construction has not changed the natural water course. If nothing is ovbious, then the next step would be to power rout the outlets. But I think you will find the problem on the outside.