American Water Works Company, Inc., through its subsidiaries, provides water and wastewater services in the United States. It offers water and wastewater services to approximately 1,700 communities in 14 states serving approximately 3.4 million active customers. The company serves residential customers; commercial customers, including food and beverage providers, commercial property developers and proprietors, and energy suppliers; fire service and private fire customers; industrial customers, such as large-scale manufacturers, mining, and production operations; public authorities comprising government buildings and other public sector facilities, such as schools and universities; and other utilities and community water and wastewater systems. It also provides water and wastewater services on various military installations; and undertakes contracts with municipal customers, primarily to operate and manage water and wastewater facilities, as well as offers other related services. In addition, the company operates approximately 80 surface water treatment plants; 480 groundwater treatment plants; 160 wastewater treatment plants; 52,500 miles of transmission, distribution, and collection mains and pipes; 1,100 groundwater wells; 1,700 water and wastewater pumping stations; 1,300 treated water storage facilities; and 76 dams. It serves approximately 14 million people with drinking water, wastewater, and other related services in 24 states. American Water Works Company, Inc. was founded in 1886 and is headquartered in Camden, New Jersey.

Companhia de Saneamento Básico do Estado de São Paulo – SABESP provides water and sewage services to residential, commercial, industrial, and governmental customers. It provides water supply, sanitary sewage, urban rainwater management and drainage, urban cleaning, and solid waste management services, as well as related activities, including the planning, operation, maintenance, and commercialization of energy. As of December 31, 2021, the company provided water services through 9.8 million water connections to approximately 27.8 million people; sewage services through 8.4 million sewage connections to approximately 24.6 million people; and operated 88,904 kilometers of water pipes and water transmission lines, as well as 61,122 kilometers of sewer lines. It also offers water and/or sewage services to four other municipalities through special purpose companies. The company was founded in 1954 and is headquartered in São Paulo, Brazil.

Essential Utilities, Inc., through its subsidiaries, operates regulated utilities that provide water, wastewater, or natural gas services in the United States. It offers water services through operating and maintenance contract with municipal authorities and other parties. The company also provides non-utility raw water supply services for firms in the natural gas drilling industry; and water and sewer line protection solutions, and repair services to households through a third-party. It serves approximately 7.5 million residential water, commercial water, fire protection, industrial water, wastewater, and other water and utility customers in Pennsylvania, Ohio, Texas, Illinois, North Carolina, New Jersey, Indiana, Virginia, West Virginia, and Kentucky under the Aqua and Peoples brands. The company was formerly known as Aqua America, Inc. and changed its name to Essential Utilities, Inc. in February 2020. Essential Utilities, Inc. was founded in 1886 and is headquartered in Bryn Mawr, Pennsylvania.

American States Water Company, through its subsidiaries, provides water and electric services to residential, commercial, industrial, and other customers in the United States. It operates through three segments: Water, Electric, and Contracted Services. The company purchases, produces, distributes, and sells water, as well as distributes electricity. As of December 31, 2021, American States Water Company provided water service to 262,770 customers located throughout 10 counties in the State of California; and distributed electricity to 24,656 customers in San Bernardino County mountain communities in California. The company also provides water and/or wastewater services, including the operation, maintenance, and construction of facilities at the water and/or wastewater systems at various military installations. American States Water Company was incorporated in 1929 and is based in San Dimas, California.

California Water Service Group, through its subsidiaries, provides water utility and other related services in California, Washington, New Mexico, Hawaii, and Texas. The company is involved in the production, purchase, storage, treatment, testing, distribution, and sale of water for domestic, industrial, public, and irrigation uses, as well as for fire protection. It offers its services to approximately 494,500 customer connections in 100 California communities; approximately 6,200 water and wastewater customer connections on the islands of Maui and Hawaii; approximately 36,400 customer connections in the Tacoma, Olympia, Graham, Spanaway, Puyallup, and Gig Harbor areas; and approximately 8,600 water and wastewater customer connections in the Belen, Los Lunas, Indian Hills, and Elephant Butte areas in New Mexico. The company also engages in the provision of non-regulated water-related services, including operating of municipally owned water systems, privately owned water, and recycled water distribution systems; water system operation, meter reading, and billing services to private companies and municipalities; leasing of communication antenna sites on its properties to telecommunication companies; and billing of optional third-party insurance programs to its residential customers, as well as provides lab services. In addition, it offers wastewater collection and treatment services. The company was founded in 1926 and is headquartered in San Jose, California.

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 company also provides non-tariffed services, including water system operations, maintenance agreements, and antenna site leases; contracted services and sewer operations to water utilities; and a Linebacker protection plan for public drinking water customers in Connecticut and Maine. Its water supply consists of groundwater from wells, surface water from watershed run-off and diversion, reclaimed water, and imported water purchased from the Santa Clara Valley Water District. The company offers water service to approximately 231,000 connections that serve approximately one million people residing in portions of the cities of San Jose and Cupertino, as well as in the cities of Campbell, Monte Sereno, Saratoga, and the Town of Los Gatos; and adjacent unincorporated territories in the County of Santa Clara in the State of California. In addition, it provides water service to approximately 140,000 connections, which serve approximately 456,000 people in 81 municipalities with a service area comprising approximately 269 square miles throughout Connecticut and Maine, as well as approximately 24,000 connections that serve approximately 70,000 people in a service area comprising approximately 266 square miles in the region between San Antonio and Austin, Texas; and approximately 3,000 wastewater connections in Southbury, Connecticut. Further, the company owns undeveloped land in California and Tennessee; and owns and operates commercial buildings and warehouse properties in Tennessee. The company was formerly known as SJW Corp. and changed its name to SJW Group in November 2016. SJW Group was incorporated in 1985 and is headquartered in San Jose, California.

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. The Non-Regulated segment provides non-regulated contract services for the operation and maintenance of municipal and private water and wastewater systems in New Jersey and Delaware. The company was incorporated in 1896 and is headquartered in Iselin, New Jersey.

Aris Water Solutions, Inc., an environmental infrastructure and solutions company, provides water handling and recycling solutions. The company's produced water handling business gathers, transports, unless recycled, and handles produced water generated from oil and natural gas production. Its water solutions business develops and operates recycling facilities to treat, store, and recycle produced water. The company was founded in 2015 and is headquartered in Houston, Texas.

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. The company also operates a 15-mile pipeline from the Susquehanna River to Lake Redman; and owns nine groundwater wells that supply water to customers in the Adams County. It serves customers in the fixtures and furniture, electrical machinery, food products, paper, ordnance units, textile products, air conditioning systems, laundry detergents, barbells, and motorcycle industries in 51 municipalities within three counties in south-central Pennsylvania. The York Water Company was incorporated in 1816 and is based in York, Pennsylvania.

Consolidated Water Co. Ltd., together with its subsidiaries, designs, constructs, manages, and operates water production and water treatment plants primarily in the Cayman Islands, the Bahamas, and the United States. The company operates through four segments: Retail, Bulk, Services, and Manufacturing. It uses reverse osmosis technology to produce potable water from seawater. The company produces and supplies water to end-users, including residential, commercial, and government customers, as well as government-owned distributors. It also provides design, engineering, construction, procurement, and management services for desalination projects and water treatment plants, as well as management and engineering services relating to municipal water distribution and treatment. In addition, the company manufactures and services a range of water-related products, including reverse osmosis desalination equipment, membrane separation equipment, filtration equipment, piping systems, vessels, and custom fabricated components; and provides design, engineering, consulting, management, inspection, training, and equipment maintenance services for commercial, municipal, and industrial water production, supply, and treatment, as well as desalination and wastewater treatment. Consolidated Water Co. Ltd. was incorporated in 1973 and is headquartered in Grand Cayman, the Cayman Islands.

Cadiz Inc., together with its subsidiaries, operates as a natural resources development company in the United States. It engages in the water resource and agricultural development activities in San Bernardino County properties. The company owns approximately 35,000 acres of land in the Cadiz and Fenner valleys of eastern San Bernardino County; and approximately 11,000 acres of land in the eastern Mojave Desert portion of San Bernardino County. It is also involved in the cultivation of lemons, and spring and fall plantings of vegetables and grains. Cadiz Inc. was founded in 1983 and is headquartered in Los Angeles, California.