Do you know it you need a pressure regulator? High water pressure isn't always obvious until it causes a problem. Too much water pressure can put extra strain on the home's plumbing systems and do harm to all of the plumbing fixtures and can even cause blowouts.
A pressure regulator is a valve that reduces the water pressure coming into the house. When installed and working properly a pressure regulator can lower the water pressure to a safe level. For more about water pressure regulator valves take a look at this pressure regulator FAQ.
Note: to be safe use a pressure gauge to check water pressure at least two or three times per year.