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.

Eversource Energy, a public utility holding company, engages in the energy delivery business. The company operates through Electric Distribution, Electric Transmission, Natural Gas Distribution, and Water Distribution segments. It is involved in the transmission and distribution of electricity; solar power facilities; and distribution of natural gas. The company operates regulated water utilities that provide water services to approximately 241,000 customers. It serves residential, commercial, industrial, municipal and fire protection, and other customers in Connecticut, Massachusetts, and New Hampshire. The company was formerly known as Northeast Utilities and changed its name to Eversource Energy in April 2015. Eversource Energy was incorporated in 1927 and is headquartered in Springfield, Massachusetts.

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.

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.

Middlesex Water Company owns and operates regulated water utility and wastewater systems. It operates in Regulated and Non-Regulated segments. 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. Middlesex Water Company was incorporated in 1896 and is headquartered in Iselin, New Jersey.

Select Water Solutions, Inc., together with its subsidiaries, provides water management and chemical solutions to the energy industry in the United States. The company operates through three segments: Water Services, Water Infrastructure, and Chemical Technologies. The Water Services segment provides water-related services, including water sourcing, water transfer, flowback and well testing, water containment, fluids hauling, water monitoring, and water network automation; technology solutions comprising hydrographic mapping, water volume and quality monitoring, remote pit and tank monitoring, leak detection, asset and fuel tracking, and automated-equipment services, as well as various surface rental equipment and workforce accommodation services. The Water Infrastructure segment engages in the recycling, gathering, transferring, and disposal of water through a network of permanent pipeline infrastructure, semi-permanent pipeline infrastructure, water recycling facilities, earthen pits, water sources, and SWDs; provides solids management services; and develops, builds, and operates semi-permanent and permanent infrastructure solutions. The Chemical Technologies segment provides technical solutions, products, and services related to chemical applications in the oil and gas industry. This segment develops, manufactures, and manages logistics; and provides chemicals used in hydraulic fracturing, stimulation, cementing, and well completions for pressure pumpers and oil and gas producers, as well as offers production chemical solutions for underperforming wells, corrosion and scale monitoring, chemical inventory management, well failure analysis, and lab services. It primarily serves oil and gas producers. The company was formerly known as Select Energy Services, Inc. and changed its name to Select Water Solutions, Inc. in May 2023. Select Water Solutions, Inc. was incorporated in 2016 and is headquartered in Houston, Texas.

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. It also provides contract water and wastewater services; water, sewer, and internal service line protection plans; and wastewater management services, as well as design, construction, and engineering services. In addition, the company offers services to other water utilities, including operations and billing functions; owns real estate properties, including land for office buildings, a water treatment plant, and wastewater facility; and provides design, installation, maintenance, and repair services related to existing or proposed storm water management systems. As of December 31, 2023, it served approximately 95,900 customers in Delaware; 2,600 customers in Maryland; and 40 customers in Pennsylvania through 1,470 miles of transmission and distribution mains. Artesian Resources Corporation was founded in 1905 and is headquartered in Newark, Delaware.

Energy Services of America Corporation, together with its subsidiaries, provides contracting services for utilities and energy related companies in the United States. The company constructs, replaces, and repairs interstate and intrastate natural gas pipelines and storage facilities for utility companies and private natural gas companies; and provides services relating to pipeline, storage facilities, and plant works. It also offers electrical and mechanical installation, and repair services, including substation and switchyard, site preparation, equipment setting, pipe fabrication and installation, packaged buildings, transformers, and other ancillary works for the gas, petroleum power, chemical, water and sewer, and automotive industries. In addition, the company provides corrosion protection services, horizontal drilling services, liquid pipeline and pump station construction, production facility construction, water and sewer pipeline installation, and various maintenance and repair services, as well as other services related to pipeline construction. Further, it serves customers primarily in West Virginia, Virginia, Ohio, Pennsylvania, and Kentucky. Energy Services of America Corporation was incorporated in 2006 and is based in Huntington, West Virginia.