In a water distribution system, what are "service connections"?

Service connections refer specifically to the points where the main water distribution line connects to individual customers' service lines. This is the crucial link that enables the delivery of water from the municipal supply to homes, businesses, and other facilities. These connections are vital for providing water service, as they typically include a shut-off valve and a meter to measure water usage. Proper installation and maintenance of service connections ensure that customers receive adequate water pressure and quality, as well as facilitate metering for billing purposes.

The other options reference components relevant to a water distribution system but do not accurately define service connections. Endpoints of the main water supply refer to the end of the network, connections to fire hydrants pertain to emergency service access, and connections to treatment facilities involve the initial processing and purification of water before it's distributed, none of which describe the specific relationship between the main line and individual customer service lines.