- Action Environmental Service Corp.
 - Providing environmental services to remedial action contractors, general contractors, government and industrial clients. Offices in Wilmington, DE and Waltham, MA. - AES, Inc.
- Environmental and engineering corporation, offering services in air quality, industrial hygiene, dispersion modelling, litigation support, remediation, and site investigation.
- Allwest Geoscience
- Geotechnical engineers and environmental consultants for the Southwestern United States.
- Ambient Engineering
- Environmental engineering and consulting for hazardous waste cleanup, geotechnical services, wastewater treatment, pond and marine studies, restoration, and more throughout the northeast.
- Blasland, Bouck and Lee Inc
- Environmental engineering firm dedicated to providing innovative alternatives responsive to today's environmental issues.
- Brown and Caldwell
- Environmental engineering and consulting firm that provides services to government and industry.
- C-K Associates, Inc.
- Offering environmental and engineering services regarding air quality, Title V, solid and hazardous waste, remediation, water quality, engineering, GIS, software, and multi-media.
- C5 Plus Group Ltd
- Certified Environmental Group, Inc.
- Provides environmental consulting, engineering, evaluation, and design and laboratory services for both the private and public sectors.
- Comprehensive Environmental Inc.
- Provides environmental engineering and consulting for hazardous wastes, air, and water resources serving the New England area.
- Conor Pacific Environmental Technologies Inc.
- Assessment, remediation, and development of contaminated sites, and a wide range of environmental services.
- DLZ Corporation
- Earth Tech
- Offers total water management, environmental and remediation, and transportation services to government and commercial clients.
- EarthWorks Soil Amendments, Inc.
- Offering landscape contractors, architects and developers solutions to soil remediation and management problems.
- Emcon
- Environmental management services.
- Enviro-Logical Solutions, Inc.
- Specialising in groundwater and soil remediation, mobile treatment, and site assessment services throughout the eastern U.S.
- EnviroBusiness, Inc.
- Provides environmental due diligence, structural assessments, training, subsurface investigations, and environmental site assessments.
- Environ Engineering
- Manufactures and supplies aerators, clarifiers, clariflocculators, and other chemical and water treatment equipment.
- Environmental and Engineering Solutions, Inc.
- Providing air quality consulting, environmental, health and safety management, and environmental engineering services to industry.
- Environmental Compliance Inc
- Environmental solutions to world wide problems.
- Environmental Litigation Associates
- Association of seven environmental scientists and engineers providing industry and the legal community with technical support.
- Epsilon Associates, Inc.
- Provides environmental analyses, licensing, permitting, and compliance services for clients the northeastern United States.
- Forest Technology Systems
- Design, manufacture, and installation of automated,remote environmental monitoring systems.
- Franklin Engineering Group
- Specialising in hazardous materials handling, chemical process, electrical, and instrumentation and controls engineering.
- GKY and Associates, Inc.
- Small civil and environmental firm with engineering, environmental, and computer science expertise.
- Globex Engineering & Development
- Specialising in the design and construction of landfill, and offering other environmental services.
- Greenways, Inc.
- Planning, design and consulting focusing in greenways, alternative transportation, rails-to-trails, open space and park planning.
- Gubanc, David M.
- Engineer with experience in plant engineering and environmental technology. Specialist in waste minimization.
- Harding Lawson Associates
- Environmental engineering company specialising in air, water, and hazardous waste.
- Hildenbrandt & Associates
- A soil engineering firm that specialises in structural inspections and foundation evaluations of residential and commercial structures.
- Horizon Environmental Corporation
- Offers environmental assessment and remediation, engineering, construction, air quality and regulatory compliance services. Located in Grand Rapids, and Detroit, MI.
- Intera, Inc.
- Environmental services company specialising in hydrogeologic site characterization/modelling/remediation.
- Kleinfelder Inc.
- Environmental and geotechnical engineering, engineering geology, construction management and materials testing.
- Lang Engineering of Florida, Inc.
- Environmental remediation projects, including asbestos/lead removal, indoor air quality/duct cleaning, and hazardous waste cleanup.
- Law Companies Group, Inc
- Leggette, Brashears & Graham, Inc.
- Provides professional ground-water and environmental engineering services.
- Limno-Tech, Inc.
- Specialising in environmental assessment, management, remediation and regulation requirements in surface and ground waters.
 Mannings
- Thermal and environmental engineering.- Mech-Chem Associates, Inc.
- Designs, engineers, and constructs processing systems for manufacturing operations, chemical bulk storage, wastewater treatment, groundwater remediation, and air pollution control.
- Mostardi Platt Associates, Inc.
- Offering services in compliance management, permitting, assessment, air testing, and continuous emissions monitoring.
- Orc AB
- Marine and industry pollution control services including studies, contingency planning, system design, and supply.
- Pacific Environmental Services, Inc.
- Penney Engineering
- Progressive environmental engineering company that designs, manufactures, installs, and operates groundwater, water, soil, and wastewater treatment systems.
- Performance Development Corporation
- PDC is a scientific and engineering management firm with field offices in South Carolina, Colorado, and Maryland.
- Provan and Lorber
- Moving or expanding your commercial, industrial, or hospital facility? Developing a housing or healthcare project? Visit our Site Development Information Centre.
- RDG Geoscience & Engineering
- Provides technical solutions in areas of ground-water investigations and soils and environmental engineering. Also manages construction projects.
- Remtech Engineers
- Specialises in soil and groundwater site remediation engineering, contracting, and equipment manufacturing.
- Robert William Environmental, Inc - Zephyr Cove, NV
- Roberts/Schornick & Associates, Inc.
- Providing engineering, remediation and regulatory compliance services.
- Stearns & Wheler
- TEC-Accutite
- Petroleum related construction, testing, maintenance, and repairs, underground tank removal and installation, and more.
- TRI-S Environmental
- Site closure, ground water, soil, modelling, remediation design, expert witness, risk-based cleanup levels.
- Vickrey & Associates, Inc.
- Civil and environmental engineering services.
- Water Control Products International
- Offers self regulating tilting weirs and fishway systems.
- Water-Lines Solutions
- Offers lake design, habitat creation, and other services, along with products such as geotextiles, root barriers, and reed bed filter systems.
- Watling Hope Environmental Engineers
- Specialises in sewage treatment, waste water management, and pollution control.
- Watts Engineers
- Specialises in civil, transportation, structural, and environmental engineering, consulting, and construction inspection services.
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