We have tried our best to figure out where the noise in the pipes are coming from. We have discovered that where our shut off valve - we thought the pipe went directly down in to the grown. However, we cut a little bit of the drywall and have discovered that the pipes goes straight down and then bends to the left and goes down in to the foundation of the house about 2 feet over. As if it is a backwards L. The noise is stronger at the bottom towards the floor, more towards where the pipes comes in to the house. Below the shut off valve. We had our county come and replace the meter but we still have the noise. We notice that when we use more water we hear it more. We noticed last night that the heater was fired up and then the noise started. However, the heater stopped firing but the noise kept going. I have included two pictures. One of the pipe inside the drywall and the other of the utility room. The noise is louder where I have the piece of wood on the drywall.