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 3.5 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 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; 540 groundwater treatment plants; 175 wastewater treatment plants; 53,700 miles of transmission, distribution, and collection mains and pipes; 1,200 groundwater wells; 1,700 water and wastewater pumping stations; 1,100 treated water storage facilities; and 74 dams. The company was founded in 1886 and is headquartered in Camden, New Jersey.

Pentair plc provides various water solutions in the United States, Western Europe, China, Eastern Europe, Latin America, the Middle East, Southeast Asia, Australia, Canada, and Japan. The company operates through three segments: Flow, Water Solutions, and Pool. The Flow segment designs, manufactures, and sells fluid treatment and pump products and systems, including pressure vessels, gas recovery solutions, membrane bioreactors, wastewater reuse systems and advanced membrane filtration, separation systems, water disposal pumps, water supply pumps, fluid transfer pumps, turbine pumps, solid handling pumps, and agricultural spray nozzles for fluid delivery, ion exchange, desalination, food and beverage, separation technologies in the oil and gas industry, residential and municipal wells, water treatment, wastewater solids handling, pressure boosting, circulation and transfer, fire suppression, flood control, agricultural irrigation, and crop spray in residential, commercial, and industrial markets. The Water Solutions segment provides commercial and residential water treatment products and systems, including pressure tanks, control valves, activated carbon products, commercial ice machines, conventional filtration products, and point-of-entry and point-of-use water treatment systems, as well as installation and preventative services for use in residential whole home water filtration, drinking water filtration, and water softening solutions, as well as commercial total water management and filtration in foodservice operations. The Pool segment provides residential and commercial pool equipment and accessories comprising pumps, filters, heaters, lights, automatic controls, automatic cleaners, maintenance equipment, and pool accessories for applications in residential and commercial pool maintenance, pool repair, renovation, service, and construction and aquaculture solutions. Pentair plc was founded in 1966 and is headquartered in London, the United Kingdom.

Essential Utilities, Inc., through its subsidiaries, operates regulated utilities that provide water, wastewater, or natural gas services in the United States. The company operates through Regulated Water and Regulated Natural Gas segments. It offers water services through operating and maintenance contract with municipal authorities and other parties. In addition, the company provides utility service line protection solutions and repair services to households. It serves approximately 5.5 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, 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, 2022, American States Water Company provided water service to 263,265 customers located throughout 10 counties in the State of California; and distributed electricity to 24,705 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 headquartered 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 services. It offers its services to approximately 497,700 customer connections in 100 California communities; approximately 6,500 water and wastewater customer connections on the islands of Maui, Oahu, and Hawaii; approximately 38,000 customer connections in the Tacoma, Olympia, Graham, Spanaway, Puyallup, Rainier, Yelm, and Gig Harbor areas; and approximately 11,400 water and wastewater customer connections in Rio Communities, Rio Del Oro, Meadow Lake, Indian Hills, Squaw Valley, Elephant Butte, Morningstar, Sandia Knolls, Juan Tomas, and Cypress Gardens systems. 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; and billing of optional third-party insurance programs to its residential customers. In addition, it provides lab, wastewater collection, and treatment services. California Water Service Group was founded in 1926 and is headquartered in San Jose, California.

SJW Group, through its subsidiaries, provides water utility and other related services in the United States. It operates in Water Utility Services and Real Estate Services segments. The company engages in the production, purchase, storage, purification, distribution, wholesale, and retail sale of water and wastewater services; and supplies groundwater from wells, surface water from watershed run-off and diversion, reclaimed water, and imported water purchased from the Santa Clara Valley Water District. It also offers non-tariffed services, including water system operations, maintenance agreements, and antenna site leases; contracted services, sewer operations, and other water related services to water utilities; and a Linebacker protection plan for public drinking water customers in Connecticut and Maine. In addition, the company provides water service to approximately 232,400 connections that serve approximately one million people residing in portions of the cities of San Jose and Cupertino and in the cities of Campbell, Monte Sereno, Saratoga, and the Town of Los Gatos; adjacent unincorporated territories in the County of Santa Clara in the State of California; water service to approximately 141,000 service connections, which serve approximately 461,000 people in 81 municipalities with a service area of approximately 272 square miles in Connecticut and Maine and approximately 3,000 wastewater connections in Southbury, Connecticut; approximately 28,000 service connections that serve approximately 83,000 people in a service area comprising approximately 271 square miles in the region between San Antonio and Austin, Texas; and approximately 950 wastewater connections. Further, it owns undeveloped land in California and Tennessee; commercial and warehouse properties in Tennessee; and commercial properties and parcels of land in Connecticut. 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.

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. The company produces potable water from seawater utilizing reverse osmosis technology and supply water to end-users, including residential, commercial, and government customers, as well as government-owned distributors. It offers 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.

The York Water Company impounds, purifies, and distributes drinking water. It owns and operates three wastewater collection systems; ten 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 satellite groundwater systems in York, Adams, and Lancaster Counties, as well as two impounding dams on primary system located in York and Springfield Townships. 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 56 municipalities within four counties in south-central Pennsylvania. The York Water Company was incorporated in 1816 and is based in York, Pennsylvania.