A sustainable plumbing system comes from a design that saves energy resources and water. Efficient designs include plumbing placements and standard materials & this must have two systems: the water supply system and waste sewage system
As the water supply is an overall system, it passes between rooms that need plumbing. This is also applicable for the drain, waste and vent system that normally runs along with or near the water supply system. A good way to save materials and to make it more efficient, is by dividing rooms that require plumbing closer together. Like placing the laundry room beside or near the kitchen and placing bathrooms near the bedrooms.