The water may be coming from the well, or it may be ground water that is getting into an unsealed conduit.
If the latter, or if the pressure is low, you can probably plug it as follows:
1. Get a Schedule 40 PVC cap that fits the PVC pipe coming into the house.
2. Disconnect your wires in the house and run them through individual holes that you will drill in the cap. The holes should be just large enough to pass the wire without damaging the insulation.
3. After moving the cap close to the existing PVC pipe, apply a liberal amount of silicone bathtub caulk or sealant to seal the points where the wires come through the cap. Keep the sealant off the point where you will need to glue the cap to the pipe through the wall.
4. Since the pressure is low, you can probably glue the cap on with the silicone. If you want, you can use PVC cement.
If you have a convenient drain, you could put a tee between the inlet and the cap (outlet pointed down) and run a pipe or hose to a drain. If you do that, you should put sealant into the pipe before the tee, and in the cap, so you will have only leakage flow to the drain.