At what water pressure must a pressure-reducing valve be installed?

A pressure-reducing valve (PRV) is typically installed to manage high incoming water pressure to a more stable and manageable level for residential or commercial plumbing systems. The commonly accepted maximum water pressure for residential plumbing is around 80 psi to prevent damage to fixtures, pipes, and appliances.

Installing a PRV is crucial when the incoming pressure from the municipal supply exceeds this threshold. Therefore, any incoming water pressure above 80 psi would necessitate the installation of a pressure-reducing valve to avoid issues such as leaks, bursts, and reduced longevity of plumbing components.

In this case, the correct pressure at which a PRV should be installed is at or above 80 psi, which protects against the adverse effects associated with excessive pressure in the plumbing system.