Waste Management, Inc., through its subsidiaries, engages in the provision of environmental solutions to residential, commercial, industrial, and municipal customers in the United States and Canada. It offers collection services, including picking up and transporting waste and recyclable materials from where it was generated to a transfer station, material recovery facility (MRF), or disposal site; and owns and operates transfer stations, as well as owns, develops, and operates landfill facilities that produce landfill gas used as renewable natural gas for generating electricity. As of December 31, 2022, the company owned or operated 254 solid waste landfills, five secure hazardous waste landfills, 97 MRFs, and 337 transfer stations. It also provides materials processing and commodities recycling services at its MRFs, where cardboard, paper, glass, metals, plastics, construction and demolition materials, and other recycling commodities are recovered for resale or redirected for other purposes; recycling brokerage services, such as managing the marketing of recyclable materials for third parties; and other strategic business solutions. In addition, the company offers construction and remediation services; services related with the disposal of fly ash, and residue generated from the combustion of coal and other fuel stocks; in-plant services comprising full-service waste management solutions and consulting services; and specialized disposal services for oil and gas exploration and production operations. The company was formerly known as USA Waste Services, Inc. and changed its name to Waste Management, Inc. in 1998. Waste Management, Inc. was incorporated in 1987 and is headquartered in Houston, Texas.

Republic Services, Inc., together with its subsidiaries, offers environmental services in the United States and Canada. It is involved in the collection and processing of recyclable, solid waste, and industrial waste materials; transportation and disposal of non-hazardous and hazardous waste streams; and other environmental solutions. Its residential collection services include curbside collection of material for transport to transfer stations, landfills, recycling centers, and organics processing facilities; supply of recycling and waste containers; and renting of compactors. The company also engages in the processing and sale of old corrugated containers, old newsprint, aluminum, glass, and other materials; and provision of landfill services. It serves small-container, large-container, and residential customers. The company was incorporated in 1996 and is based in Phoenix, Arizona.

Waste Connections, Inc. provides non-hazardous waste collection, transfer, disposal, and resource recovery services in the United States and Canada. It offers collection services to residential, commercial, municipal, industrial, and exploration and production (E&P) customers; landfill disposal services; and recycling services for various recyclable materials, including compost, cardboard, mixed paper, plastic containers, glass bottles, and ferrous and aluminum metals. The company owns and operates transfer stations that receive compact and/or load waste to be transported to landfills or treatment facilities through truck, rail, or barge; and intermodal services for the rail haul movement of cargo and solid waste containers in the Pacific Northwest through a network of intermodal facilities. In addition, it provides E&P waste treatment, recovery, and disposal services for waste resulting from oil and natural gas exploration and production activity, such as drilling fluids, drill cuttings, completion fluids, and flowback water; production wastes and produced water during a well's operating life; contaminated soils that require treatment during site reclamation; and substances, which require clean-up after a spill, reserve pit clean-up, or pipeline rupture. Further, the company offers leasing services to its customers. Waste Connections, Inc. was founded in 1997 and is based in Woodbridge, Canada.

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.

GFL Environmental Inc. offers non-hazardous solid waste management and environmental services in Canada and the United States. It offers solid waste management, liquid waste management, and soil remediation services, including collection, transportation, transfer, recycling, and disposal services for municipal, residential, and commercial, and industrial customers. The company was incorporated in 2007 and is headquartered in Vaughan, Canada.

Clean Harbors, Inc. provides environmental and industrial services in the United States and internationally. The company operates through two segments, Environmental Services and Safety-Kleen Sustainability Solutions. The Environmental Services segment collects, transports, treats, and disposes hazardous and non-hazardous waste, such as resource recovery, physical treatment, fuel blending, incineration, landfill disposal, wastewater treatment, lab chemicals disposal, and explosives management services; and offers CleanPack services, including collection, identification, categorization, specialized packaging, transportation, and disposal of laboratory chemicals and household hazardous waste. This segment also provides industrial maintenance and specialty industrial services; and utilizes specialty equipment and resources that performs field services. The Safety-Kleen Sustainability Solutions segment provides pickup and transportation services for hazardous and non-hazardous containerized waste for recycling or disposal; machine cleaning and maintenance, and disposal and replenishment of clean solvent or aqueous fluids; and vacuum services to remove solids, residual oily water, and sludge and other fluids from customers' oil/water separators, sumps, and collection tanks, as well as removes and collects waste fluids found at large and small industrial locations, including metal fabricators, auto maintenance providers, and general manufacturers. This segment also manufactures, formulates, packages, distributes, and markets lubricants and other automotive products. Clean Harbors, Inc. was incorporated in 1980 and is headquartered in Norwell, Massachusetts.

Casella Waste Systems, Inc., together with its subsidiaries, operates as a vertically integrated solid waste services company in the United States. It offers resource management services primarily in the areas of solid waste collection and disposal, transfer, recycling, and organics services to residential, commercial, municipal, institutional, and industrial customers. The company provides non-hazardous solid waste services, including collections, transfer stations, recycling, and disposal operations. In addition, it markets materials, including fibers, corrugated cardboard, newsprint, plastics, glass, ferrous, and aluminum metals. Casella Waste Systems, Inc. was founded in 1975 and is headquartered in Rutland, Vermont.

Quest Resource Holding Corporation, together with its subsidiaries, provides solutions for the reuse, recycling, and disposal of various waste streams and recyclables in the United States. The company provides disposal and recycling services for motor oil and automotive lubricants, oil filters, scrap tires, oily water, goods destruction, food waste, meat renderings, cooking oil and grease trap waste, plastics, cardboard, metal, glass, mixed paper, construction debris, as well as a large variety of regulated and non-regulated solid, liquid, and gas wastes. It offers antifreeze and windshield washer fluid, dumpster and compacting equipment, and other minor ancillary services. In addition, the company offers landfill diversion services. Its services focus on the waste streams and recyclables from big box, grocers, and other retailers; automotive maintenance, quick lube, dealerships, and collision repair; transportation, logistics, and internal fleet operators; manufacturing plants; multi-family and commercial properties; restaurant chains and food operations; and construction and demolition projects. The company markets its services to automotive, manufacturing, hospitality and retail, construction and demolition, and commercial and multi-family property management industries through direct sales force and strategic partnerships. The company was formerly known as Infinity Resources Holdings Corp. and changed its name to Quest Resource Holding Corporation in October 2013. Quest Resource Holding Corporation is headquartered in The Colony, Texas.