The answer to 'why is my pipe low water pressure' is that there are several common causes, including mineral buildup, leaks, or a problem with the main water supply. Low water pressure can be caused by a partial blockage in the pipe, a problem with the water heater, or an issue with the municipal water supply.
If you have low water pressure, first check for visible leaks and make sure your water heater is functioning properly. Mineral deposits and corrosion can also restrict water flow over time. In some cases, the issue may be with the main water supply line leading to your home. If you've ruled out these common causes, it's best to call a professional plumber to diagnose and fix the problem.