Water supply in building is an essential service that ensures the availability of safe and adequate water for drinking, cooking, bathing, cleaning, sanitation, fire fighting, and other domestic and commercial purposes. A well-planned water supply system contributes to the health, comfort, and convenience of occupants and plays a vital role in the overall functionality of a structure. In the context of building construction and maintenance, proper design, installation, and upkeep of the water supply system are necessary to prevent wastage, contamination, leakage, and structural damage. The primary objective of a building water supply system is to provide continuous and sufficient water at required pressure to all fixtures and appliances. The source of water may be a municipal supply, borewell, open well, river, lake, or other local sources. In urban areas, municipal supply is the most common source, where water is treated and distributed through public pipelines. In rural or remote areas, groundwater through borewells or tube wells is frequently used. The quality and reliability of the source directly affect the design and maintenance requirements of the internal water supply system. The components of a typical water supply system in a building include the service connection, water meter, underground storage tank, pump, overhead tank, distribution pipes, valves, and plumbing fixtures. The service connection links the building to the main municipal pipeline. A water meter is usually installed to measure consumption for billing