A water distribution system is the network of pipes, pumps, storage facilities, and valves that delivers treated drinking water from treatment plants to homes, businesses, and other users. Distribution systems include large transmission mains, smaller distribution mains serving neighbourhoods, and service lines connecting to individual properties. Storage reservoirs and elevated tanks maintain pressure and provide reserves for peak demand and emergencies. Pressure zones accommodate elevation changes. Distribution system management involves maintaining adequate pressure and flow, minimizing water loss through leaks, flushing to maintain water quality, and responding to main breaks. Distribution infrastructure represents enormous municipal investment, often the largest infrastructure asset, requiring ongoing maintenance, repair, and replacement as pipes age.