- Savci Environmental Technologies
- Multi-disciplinary consulting firm providing specialised environmental and engineering services for natural resource industries. - IPEC Global, Inc.
- Providing design and construction of industrial chemical processing and hazardous waste treatment facilities, as well as environmental consulting. - Millennium Science and Engineering, Inc.
- International environmental consulting company specialising in wastewater engineering, groundwater and hazardous waste management, pollution prevention, and other areas. - Hydrotechnology Consultants, Inc.
 - Engeo Incorporated
- Providing geotechnical and environmental consulting services. - Fugro West
- Geoscience consulting and marine survey firm offering geotechnical engineering, earthquake engineering, environmental engineering, and construction materials testing. - PM Environmental
- A full service environmental consulting firm serving business, industry, agriculture, and government throughout the midwest. - Walsh Environmental Scientists and Engineers, Inc.
- Domestic and international environmental consulting. site assessments, impact statements, remediation, bioremediation, industrial hygiene, indoor air quality, GIS, and remote sensing services. - Decommissioning Consulting Services Limited (DCS)
- Specialising in property assessments and environmental audits, geotechnical engineering, hydrogeology, site remediation and decommissioning, waste and wastewater management and industrial hygiene. - Birmingham Engineering & Construction Consultants
- Specialises in geotechnical, environmental, and construction materials testing and inspection services. - Pinyon Environmental Engineering, Inc.
- Offers consulting services related to the assessment, investigation and remediation of real property, and regulatory compliance assistance. - River Research and Design, Inc.
- Engineering consulting for problems in rivers and streams dealing with sedimentation, bank stability, stream restoration, and more. - Watershed Consulting
- Specialises in water and land resource evaluation and ecological restoration. - Green Business Alliance
- Leading businesses to a greener future with realistic green practices. - United Consulting
- Multi-disciplined, full-service environmental, geotechnical, geophysical, and materials testing engineering consulting firm.
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