What defines the difference between water supply and water distribution piping?

The distinction between water supply and water distribution piping is significant in plumbing systems. Water supply piping refers to the system of pipes that brings treated and potable water into a building from an external source, such as a municipal water supply or a well. This water is typically of a quality suitable for drinking and all household uses.

On the other hand, water distribution piping is the network within the building that delivers this supplied water to various fixtures, appliances, and outlets, such as sinks, toilets, and showers. This internal system is responsible for ensuring that the treated water reaches designated areas, allowing for safe and convenient usage.

Understanding this separation helps in recognizing the different purposes and requirements for each type of piping. The water supply system must comply with regulations for cleanliness and safety before it enters the building, while the distribution system focuses on how that water is effectively delivered to end users inside the building.