Yep... we did not realize it for years. We had leaky toilet valves and copper pipe joints leak a few times and finally a plumber noticed the contractor had not installed a pressure valve on the house and tested the pressure. Ever since we installed the valve on the house all the problem are gone.
I installed one myself on the irrigation pipe when we went to desert landscaping and drip last year. I have the house set at 60 and irrigation at 50PSI.