- Aquarion
 - Public water supply company in NY and CT with interests in surplus water company land, contract management of municipal water systems, and timber processing. - Alliant Energy
- Provides electric, natural gas, water, and steam services to customers worldwide.
- American States Water Company (AWR) (2)
- American Water Works Company
- Provides water, wastewater, and other water resource management services and products.
- Anglian Water
- Operating water and wastewater treatment facilities in the U.K. and worldwide.
- Artesian Water
- Sells water to residential, commercial, industrial, governmental, municipal, and utility customers throughout Delaware.
- California Water Service Company (1)
- East Bay Municipal Utility District (MUD)
- ECO Resources, Inc.
- Provides water and wastewater operation and management services under contract to cities, utility districts, and private companies.
- Environmental Management Corporation
- Independent operator of water, wastewater, and public works systems in the Midwest.
- Florida Public Utilities Company
- Distributing natural and propane gas, electricity, and water to different areas in Florida.
- New Mexico-American Water Company
- Private utility company offering various water service.
- Northumbrian Water
- Supplying domestic and commercial water and wastewater services to the North of England and in Europe.
- Philadelphia Suburban Water Co. (1)
- Scottish Water
- Providing water and wastewater services to household and business customers.
- Severn Trent
- International provider of water and wastewater services.
- USDA Rural Utilities Service (RUS)@
- WaterMaster America, Inc.
- Provides water sub-metering products and services to commercial and residential rental real estate.
- Western Water
- Providing safe, sparkling clean water and wastewater services.
- Western Water Company
- Acquires, develops, and markets wholesale water supplies to cities and water districts in the western United States.
- York Water Company
- Regulated utility distributing water to residential and industrial customers.
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