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A. O. Smith Corporation manufactures and markets residential and commercial gas and electric water heaters, boilers, heat pumps, tanks, and water treatment products in North America, China, Europe, and India. The company offers water heaters for residences, restaurants, hotels, office buildings, laundries, car washes, and small businesses; boilers for hospitals, schools, hotels, and other large commercial buildings, as well as homes, apartments, and condominiums; and water treatment products comprising point-of-entry water softeners, well water solutions, and whole-home water filtration products, and point-of-use carbon and reverse osmosis products for residences, restaurants, hotels, and offices. It also provides commercial water treatment and filtration product; expansion tanks, commercial solar water heating systems, swimming pool and spa heaters, and related products and parts; and electric wall-hung, gas tankless, combi-boiler, and heat pump and solar water heaters. The company offers its products under the A. O. Smith, State, Lochinvar, Hague, Water-Right, Master Water, Atlantic Filter, and Water Tec brands. It distributes its products through independent wholesale plumbing distributors, as well as to retail channels consisting of hardware and home center chains, and manufacturer representative firms; and offers Aquasana branded products directly to consumers through e-commerce channels. A. O. Smith Corporation was founded in 1874 and is headquartered in Milwaukee, Wisconsin.

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.

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.

Global Water Resources, Inc., a water resource management company, owns, operates, and manages regulated water, wastewater, and recycled water systems primarily in metropolitan Phoenix and Tucson, Arizona. It serves approximately 82,000 people in approximately 32,000 homes. The company was founded in 2003 and is based in Phoenix, Arizona.

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.

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.

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.

Xylem Inc., together with its subsidiaries, engages in the design, manufacture, and servicing of engineered products and solutions worldwide. It operates through four segments: Water Infrastructure, Applied Water, Measurement & Control Solutions, and Integrated Solutions and Services. The Water Infrastructure segment offers products, including water, storm water, and wastewater pumps; controls and systems; filtration, disinfection, and biological treatment equipment; and mobile dewatering equipment and rental services under the ADI, Flygt, Godwin, Sanitaire, Magneto, Neptune Benson, Ionpure, Leopold, Wedeco, and Xylem Vue brands. The Applied Water segment provides pumps, valves, heat exchangers, controls, and dispensing equipment systems under the Goulds Water Technology, Bell & Gossett, A-C Fire Pump, Standard Xchange, Lowara, Jabsco, Xylem Vue, and Flojet brands. The Measurement & Control Solutions segment offers smart meters, networked communication devices, data analytics, test equipment, controls, sensor devices, software and managed services, and critical infrastructure services; and software and services, including cloud-based analytics, remote monitoring and data management, leak detection, condition assessment, asset management, and pressure monitoring solutions, as well as testing equipment. This segment sells its products under the Pure Technologies, Sensus, Smith Blair, WTW, Xylem Vue, and YSI brands. The Integrated Solutions and Services segment provides maintenance services, mobile services, digital outsourced solutions, wastewater systems, environmental remediation, odor and corrosion control, filtration, reverse osmosis, ion exchange, and deionization under Aquapro, WaterOne, and Ion Pure brands. Xylem Inc. was formerly known as ITT WCO, Inc. and changed its name to Xylem Inc. in May 2011. Xylem Inc. was incorporated in 2011 and is headquartered in Washington, District of Columbia.

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.