Which type of water system is controlled by a public authority?

A public water main is a critical infrastructure system managed by a public authority responsible for providing potable water to the community. This system is designed to ensure that water supply standards are maintained, and it is subject to regulations and oversight to ensure the delivery of safe, clean drinking water. Public water mains connect to residential and commercial properties, facilitating the distribution of water for various uses such as drinking, cooking, and sanitation.

In contrast, private water lines operate independently of public oversight and are typically found within private property boundaries. Individual vents relate to the plumbing system's venting, while drainage systems are focused on the disposal of wastewater rather than the supply of potable water. Therefore, the distinction lies in the public authority's role in maintaining, regulating, and ensuring the integrity of the public water main as part of the community's water supply system.