When water pressure within a building exceeds what pressure must an approved water pressure reducing valve be installed?

An approved water pressure reducing valve must be installed when the water pressure within a building exceeds 80 PSI. This requirement is in place to prevent damage to plumbing fixtures, piping, and appliances caused by excessively high water pressure. When pressure exceeds this threshold, it can lead to issues such as leaks, excessive wear on components, and even catastrophic failures of plumbing systems.

The International Plumbing Code establishes this standard to ensure safe and efficient plumbing operation, promoting longevity and functionality of the water distribution system. Maintaining water pressure within acceptable levels is crucial for both safety and performance, making the installation of a pressure reducing valve essential when the pressure exceeds 80 PSI.