A new waterline for a new residence pressure varies from 45-60 psi average is 53 psi highest fixture is 20′ above main meter. What pressure would be used to determine pipe size from the water pipe sizing table in chapter 10 of the UPC?

A new waterline for a new residence pressure varies from 45-60 psi average is 53 psi highest fixture is 20′ above main meter. What pressure would be used to determine pipe size from the water pipe sizing table in chapter 10 of the UPC?