- AbTech Industries, Inc.
- Scottsdale - Maker of polymer absorbents and passive skimmers for oil spill remediation and nonpoint source pollution prevention. - Allied Waste Industries
- Scottsdale - Provides collection, transfer, recycling, and disposal services for residential, commercial, and industrial customers. - Liesch Companies
- Phoenix - From designing and overseeing the construction of a wastewater treatment plant to investigating and remediating soil and groundwater impacts. - Wastewater Resources Inc.
- Scottsdale - Designs, manufactures, and installs turnkey water and wastewater treatment systems and components.
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