Pinhole leaks in copper pipes happen as a result of internal corrosion. The corrosion can happen because of water quality and/or dissimilar metals in the water piping system. If your water is at the wrong pH or contains certain minerals, or lacks certain qualities, your pipes can begin to fail. Connecting dissimilar metals in plumbing creates a chemical reaction which will eventually cause the leaks. It is common in our area to find copper water piping systems in failure when the system is supplied by a well. While copper is otherwise usually a good choice for water piping within a home, there are other materials that should be chosen for new construction or for replacement of the system. PEX plastic piping is an excellent choice. If the home is copper and the damage to the piping is minimal, there are treatment options that can remove the aggressive agents from the water and restore a balance to the water in the copper system.