One Standard and what I believe is in the InterNACHI coarse/reference material will state that 40-80 psi is considered normal range. However there are a few things to consider. The extra 2psi per say may not be that big of a deal however seeing that most Pressure Reducing Valves or “Water Pressure Regulators” (that is what we call them in these here parts). Have a range that they can be set, usually something like 25-75 psi. (Factory set is usually 50 psi and is stamped on a tag)
The thing to Remember is 75 psi is the high side for those regulators. If you are reading over 75 psi, most likely the regulator is bad or the system does not have one installed. and that 82 reading may be Much higher at other times.
Now if I’m reading the OP correctly, The System does not have a regulator installed and you are reading 82 psi. At least where I am, city pressure fluctuates and normally always over 80 psi. 120-140 psi is very common here.
There are two reasons you need a “Pressure Regulator”
- To keep water supply pressure at a “Safe Level”
- To keep the pressure Consistent and Stable.*
Fluctuating pressure is not good. The weak link in most systems is the water heater, and fluctuating pressures (even if always in the normal range of less than 80 psi), will cause metal fatigue and that will eventually cause the WH tank to fail. (main reason for a thermal expansion tank and why your water heater warranty is void if a Thermal Expansion Tank not also installed )
*This is why I prefer the term “Pressure Regulator” and not simply Pressure Reducer.