Most plumbing professionals recommend a PRV setting between 35 and 60 PSI. Sustained pressure that exceeds 80 psi can damage on-site plumbing systems and may affect your water fixtures. PRVs should be installed on the customer's side of the water meter and are usually located near the water heater, water softener or on the inlet water line between your home and the water meter.
If your home water system does not have a PRV, you can purchase them from a licensed plumber, who can install the PRV. If a PRV already exists, it may just need an adjustment to decrease the pressure at the property.
The City recommends that you consult a licensed plumber for adjustments and service to your PRV