If you have copper pipes in your home, you may have experienced pinhole leaks before. These tiny holes usually occur in pipes near the main water line of a home where pressure is greatest. They also usually occur near a joint in the plumbing, where water surges around the bend and causes corrosion from the inside out—and where the pipe wasn't reamed when the plumber was cutting it. However, there can be other causes as well including the age of the pipes, the minerals in the water, and water pressure. While copper has been the gold standard in plumbing for many years, it is susceptible over time to these tiny leaks. The good news is that PEX pipe can be attached to copper, so you can replace the copper plumbing in your home to durable plastic little by little.