At what pressure is a pressure reducing valve (PRV) recommended?

The Universal Plumbing Code (UPC) recommends to use a PRV if your water pressure is 80 pounds per square inch (psi) or higher.

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1. What is a Pressure Reducing Valve (PRV)?
2. At what pressure is a pressure reducing valve (PRV) recommended?
3. What is the state minimum pressure requirement?
4. What does static-residual pressure mean?
5. Why does water pressure vary throughout the District?