How to Bury a Water Supply Line in a Floor

Determine the location of your main water pipe. The water supply line will need to connect to this pipe. Clear the floor of any obstructions. Determine the location where you wish to position the new water line.

Use a jackhammer to break up the floor in the area where you'll bury the water supply line. Make sure you don't dig beneath the foundation of your home or damage any nearby walls. Remove the broken floor pieces and discard them.

Position your hose, after attaching it to a high-pressure washer so its nozzle faces the soil beneath the removed floor. Turn on the pressure washer. The water pressure will slice a hole, or channel, in the soil. Switch off the high-pressure washer. Place a drop cloth along both sides of the floor to catch any mud spread by the high-pressure washer.

Lay out PVC pipes in the channel. Dry fit them together first, using PVC connectors. When you're satisfied with the arrangement, connect the PVC pipes to your home’s main water pipe.

Add PVC glue to the inside edges of the PVC couplings and outer edges of the pipe when connecting them to form your water line and to connect the line to the main pipe. Allow the glue to dry, based on the glue product's label instructions. Use a shovel to replace the soil you removed.