In residential plumbing, which piping system includes the water service and all potable piping to supply a single dwelling?

• A. Individual Water System
• B. City Water System
• C. Public Water System
• D. Shared Water System

Answer: (A)

The idea being tested is how a residential water supply is classified by how many dwellings it serves. An individual water system is defined as the water service line from the point where the supply enters the property, along with all potable piping inside the building, that serves a single dwelling. This includes the service connection, interior distribution piping, and any outdoor piping needed to supply that home. That’s why it best fits the description: it explicitly supplies only one residence.

A city water system refers to the municipal network that provides water across many buildings; it’s not limited to one home. A public water system is a regulatory term for systems serving 25 or more people routinely, again indicating multiple properties. A shared water system serves more than one dwelling but isn’t the single-dwelling private supply being described.