You just bought an older home in an area that has hard water. If the entire house has bad water pressure, where's the first place to look?

Answer - Check the supply lines in the basement to see if they're galvanized steel. Galvanized steel pipes commonly have deposits that have built up over time, inside of them, sometimes choking them off to the point that water can barely get through.

Plumbing - pages 155 - 156