Our water lines were also noisy, but are much quieter now. Most of the noise was coming from under the kitchen counter where the pipes were vibrating against the wall. I put some foam around the pipes which helped a lot, but I still had more noise than I wanted. There was already a rubber mat under the pump, so I added an
accumulator tank that helped with the noise and also reduced the on/off cycles as the pump is running. We still hear the pump, but there is no longer a loud noise when the water is running.