In many Northeastern Ohio communities, residential water pressure can be too high. Your water pressure is usually set by the municipal water company; that pressure, which needs to be sufficient to get water to hydrants and structures at high elevations, often exceeds 100-150 psi. However, the maximum water pressure recommended for residential buildings is 80 psi.

Excessive water pressure can cause leaks, damage to pipes and fixtures, and wasted water. You may hear “water hammer,” a banging in the pipes as the high-pressure water stops suddenly. The usual remedy is a pressure regulator, a device that reduces the pressure of the water entering the house to a safe level. This valve is usually installed on the main water line after the main shut off valve.

To determine if you need a pressure regulator, you can buy an inexpensive pressure gauge at your local hardware store. Screw it onto any hose bib or washing machine bib, and turn on the water. (Make sure no water is being used elsewhere in the house.) Test at various times, because water pressure can fluctuate during the day. If your pressure ever exceeds 40-60 psi, you should consider installing a pressure regulator.

If you have a pressure regulator on your water line, Ohio Plumbing Code requires that you also install a thermal expansion tank on the cold water pipe above your water heater. The tank contains an bladder that gives water a place to go as it expands when heated, preventing pressure changes that can damage your plumbing system.