The pressure regulator for city water is anywhere from the water meter to just inside the house. If you have your own well, it is the pressure switch that controls the well pump.
You need to get a pressure gauge that screws on an outside faucet. The check both the static water pressure, no water running, and the dynamic pressure, when you are running water. Then you adjust the pressure regulator or switch (and captive air pressure in the pressure tank). A regulator usually has a bolt with a lock nut on it, you loosen the nut and tighten or loosen the bolt. I don't know which rises or lowers the pressure.
Don't go above 65 psi for either city or a well system.