Water pressure. Too much or too little

I recently bought a home in Columbia, South Carolina, and my home inspector said that the water pressure was too high, and should be set to between 40 and 80 PSI. Why is this so?

Patrick Mahoney Owner/Operator of SHERLOCK HOME INSPECTOR

I recently bought a home in Columbia, South Carolina, and my home inspector said that the water pressure was too high, and should be set to between 40 and 80 PSI. Why is this so? A. The plumbing in your home is designed to function with water pressure between 40 and 80 pounds per square inch (PSI). If the pressure is too low, the water flow in the toilets, faucets and other fixtures will be weak, and if you are running your washing machine and trying to take a shower at the same time, you may not have enough pressure. On the other hand, if the pressure is too high it could cause leaks in the system, and in an extreme case could burst a pipe or fixture. This is especially true in older homes with pipes that may not be in the best condition. I once inspected a house that had a water pressure of 100 PSI, and the owner told me that his garden hoses were always blowing apart. A water pressure of 60 PSI is usually just right for most houses. If your local water supplier will not or cannot adjust the pressure to your home, a plumber can install a pressure regulator between the meter and the house. 12/1/2004 12:00:00 AM