There are a few different ways that water lines can be ran in a house. The most common way is to have the main water line come into the house from the street and then branch off to different areas of the house. This is typically done with copper piping. Another way to run water lines is to have them come directly from a well. This is often done in rural areas where there is no access to city water. The last way to run water lines is to use a combination of both city water and a well. This is typically done when there is only partial access to city water or if the homeowner wants to have a backup source of water in case of an emergency.