Major drop in water flow and pressure at a Minneapolis Home Inspection with a lead main water pipe
There was a major drop in water pressure at this house with more than one fixture running. The main water supply pipe from the street was lead and these are known to be problematic. The water distribution pipes in the home were undersized (1/2 " diameter in most areas and 3/8" to the bathroom sink) in an attempt to increase pressure on poor water flow (similar to putting your thumb on the end of a garden hose to increase pressure). Typical distribution pipe diameter is 3/4" after the meter and will allow more than twice the volume of water to flow compared to 1/2" pipe that is present. Replacing the lead water main and distribution pipes in the house would be a major project involving digging up the front yard. This may be triggered by any major bathroom remodeling projects that would need to be brought up to current code, depending on what the local building official required.