Middlesex Water Company owns and operates regulated water utility and wastewater systems. It operates in two segments, Regulated and Non-Regulated. The Regulated segment collects, treats, and distributes water on a retail and wholesale basis to residential, commercial, industrial, and fire protection customers, as well as provides regulated wastewater systems in New Jersey and Delaware.

California Water Service Group, through its subsidiaries, provides water utility and other related services in California, Washington, New Mexico, Hawaii, and Texas.

American States Water Company, through its subsidiaries, provides water and electric services to residential, commercial, industrial, and other customers in the United States.

Artesian Resources Corporation, through its subsidiaries, provides water, wastewater, and other services in Delaware, Maryland, and Pennsylvania. The company distributes and sells water to residential, commercial, industrial, governmental, municipal, and utility customers, as well as for public and private fire protection in the states of Delaware, Maryland, and Pennsylvania; and offers wastewater collection, treatment infrastructure, and wastewater services to customers in Delaware.

SJW Group, through its subsidiaries, provides water utility services in the United States. It engages in the production, purchase, storage, purification, distribution, wholesale, and retail sale of water and wastewater services.

The York Water Company impounds, purifies, and distributes drinking water. It owns and operates three wastewater collection systems; five wastewater collection and treatment systems; and two reservoirs, including Lake Williams and Lake Redman, which hold approximately 2.2 billion gallons of water.