Based on Engineering News Record’s (ENR) list of The Top 200 Environmental Firms* by practice area and revenue (2013), as well as a selection of firms that have recruited from Yale School of Forestry & Environmental Studies. This list is meant to be a sampling. Firms listed generally have multiple practice areas and locations; only U.S. corporate headquarters are shown here. 
To view the complete list, please log in to the Yale Library ( to access the subscription to ENR.  Citation: *The Top 200 Environmental Firms. Rubin, Debra. Engineering News-Record. 8/12/2013, Vol. 271 Issue 6, p 43.

Additional Resources:

Hazardous Waste

Firm About
Geo-Solutions Inc.
New Kensington, PA
GSI is a specialty geoenvironmental / geotechnical contractor that provides a range of services for projects including soil mixing, jet grouting, slurry walls, biopolymer collection trenches, and other grouting services.  GSI's clients include owners, contractors, engineers, federal agencies, and law firms.
Creamer Environmental Inc.
Hackensack, NJ
CEI is a full-service remediation implementation firm. Scope of services includes: soil, sediment, and groundwater remediation; containment, caps, and liners; manufactured gas plant cleanups; treatment systems and technologies; tank services; decontamination and demolition; brownfields remediation.
Highlands Ranch, CO
ARCADIS is an international company providing consultancy, design, engineering and management services in the fields of infrastructure, water, environment and buildings.
EA Engineering, Science and
Technology, Inc.

Hunt Valley, MD
EA is a leading provider of environmental, engineering, compliance, information technology, natural resources, and infrastructure management solutions to a wide range of governmental and industrial clients.
Roux Associates Inc.
Islandia, NY
Roux Associates is a professional services firm providing a broad range of consulting and project management services to solve complex environmental, health, and safety problems associated with air, water, land, and interior pollution; hazardous materials; and toxic waste treatment and disposal.

Nuclear Waste

Firm About
EnergySolutions Inc.
Salt Lake City, UT
EnergySolutions is a worldwide leader in the safe recycling, processing and disposal of nuclear material. We provide innovations and technologies to the U.S. Department of Energy, commercial utilities, medical and research facilities. In the United Kingdom, we operate and provide nuclear decommissioning services for 22 nuclear power plants.
Fluor Corp.
Irving, TX
Fluor is a Fortune 500 company that delivers engineering, procurement, construction, maintenance (EPCM), and project management to governments and clients in diverse industries around the world.
The S.M. Stoller Corp.
Broomfield, CO
Stoller is leading provider of environmental, nuclear, and technical consulting and engineering services to the DoD, DOE, and private sector.
Portage, Inc.
Idaho Falls, ID
Portage, Inc., provides comprehensive engineering and technical solutions for environmental, infrastructure, and energy projects. Primary service areas include environmental remediation, engineering, hazardous and radioactive waste management, project management, environmental compliance and planning.
Merrick & Co.
Greenwood Village, CO
Merrick provides engineering, architecture, design-build, commissioning, surveying, planning, and geospatial services. Markets served include energy, national security, nuclear, life sciences, infrastructure, and water resources.


Firm About
Environmental Resources Management Inc.
London, UK
ERM is a leading global provider of environmental, health, safety, risk, and social consulting services. Core services include air quality and climate change, impact assessment and planning, contaminated site management, and risk management.
Golder Associates Co.
Mississauga, Ontario, CAN
We strive to be the most respected global company providing consulting, design, and construction services in earth, environment, and related areas of energy. Services include decommissioning and decontamination, environmental and social assessment, ground engineering, environmental management and compliance.
The Cadmus Group, Inc.
Waltham, MA
At Cadmus, in partnership with our government and commercial clients, we deliver services and solutions that transform markets and behaviors, create social and economic value, and improve people’s lives. Our service offerings are grounded in the physical and life sciences, engineering, and social sciences, enabling us to take a collaborative, multidisciplinary approach.
Sage Environmental Consulting LLP
Austin, TX
Sage provides a broad range of specialty environmental services for facilities that need to maximize operational flexibility and stay within EPA regulations. Areas of service include air quality; groundwater, soil, and waste remediation.
The Babcock & Wilcox Co.
Charlotte, NC
B&W is an international provider of energy products and services. Our five business units provide quality fossil, environmental, commercial and government nuclear operations, products and services.


Firm About
Tetra Tech, Inc.
Pasadena, CA
Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services. The Company supports government and commercial clients by providing innovative solutions focused on water, environment, energy, infrastructure, and natural resources.
RMC Water and Environment
Walnut Creek, CA
RMC Water and Environment is a California-based environmental engineering company focused exclusively on water.
Shimmick Construction Co.
Oakland, CA

Shimmick is a general engineering contractor for the Western U.S. With a focus on heavy civil construction, successful projects span across all markets, from bridges and water/wastewater treatment facilities to dams, transit/rail and design-build.
Garney Holding Co.
Kansas City, MO

Garney is a 100% employee-owned construction company servicing the public, private and industrial sectors, specializing in water and wastewater piping systems, concrete structures, and water treatment facilities.
Alberici Corp.
St. Louis, MO
Alberici offers general contracting, construction management and design-build solutions across a broad spectrum of industrial and commercial markets: automotive, building, energy, heavy industry, mining, water and wastewater.

Wastewater Treatment

Firm About
Traylor Bros. Inc.
Evansville, IN

Traylor Bros., Inc. is one of the nation’s leading heavy civil contractors. Divisions of service include bridge, marine, and underground projects.
Aegion Corp.
St. Louis, MO
Aegion's companies provide proprietary technologies and services for the corrosion protection of industrial pipelines and for rehabilitating and strengthening sewer, water, energy and mining piping systems, buildings, bridges and tunnels and waterfront structures.
RJN Group Inc.
Wheaton, IL

RJN Group, Inc. is a professional engineering and specialty field services firm providing sustainable collection system solutions for infrastructure owners. Service areas include water, wastewater, stormwater, transportation, and design-build.
Staab Construction Corp.
Marshfield, WI
Staab Construction Corporation is a general contractor focusing on the construction of wastewater & water treatment facilities, water control structures and dams.
American Contracting and Environmental Services Inc.
Laurel, MD
American Contracting is a general contractor in the mid-Atlantic region that specializes in the construction of water and wastewater treatment facilities.

Environmental Management

Firm About
Closed Loop Advisors
New York, NY
Closed Loop Advisors is a management consultancy specializing in environmental sustainability. We guide our clients to reduce their environmental footprint, improve their social impact and save money along the way.
Chambers Group Inc.
Santa Ana, CA
Chambers Group, Inc., a certified Disabled Veteran Business Enterprise, provides environmental consulting services throughout the western United States. With roots in environmental compliance and natural resources management, Chambers Group works on behalf of its clients to avoid or reduce project impacts to the environment while keeping projects moving forward.
Partner Engineering and Science Inc.
Torrance, CA
Partner’s main services revolve around environmental and engineering consulting for the commercial real estate industry, including Phase I environmental site assessments, property condition assessments, probable maximum loss reports, construction services, and site mitigation and clean-up.
Bureau Veritas
Ft. Lauderdale, FL
Bureau Veritas is a global company in testing, inspection and certification services. Divisions include marine, industry, construction, certification, consumer products, and government services.
EBI Consulting
Burlington, MA
EBI Consulting provides environmental risk and compliance management, due diligence, energy efficiency, and engineering services. We are a top national provider of environmental, civil and structural engineering services to the real estate, financial services and wireless telecommunications industries

Environmental Science

Firm About
Environmental Science Associates
San Francisco, CA
ESA is an environmental science and planning firm of more than 300 professionals in 16 offices across the Western United States and Florida. We specialize in all aspects of project planning, environmental analysis and assessment, and regulatory compliance.
Ecology and Environment Inc.
Lancaster, NY
E & E is a recognized global leader in environmental management. Employing over 1,150 respected experts in 85 engineering and scientific disciplines, E & E has offices in 43 cities across the United States and in 17 locations around the globe.
Cardno USA Inc.
Portland, OR
Cardno is an ASX-200 professional infrastructure and environmental services company, with expertise in the development and improvement of physical and social infrastructure for communities around the world.
Normandeau Associates
Bedford, NH
Normandeau Associates, Inc. is an employee-owned national leader in environmental consulting and management. Services encompass environmental assessment, impact statements, and specialized environmental studies in support of planning activities, design, permitting, construction, and operations.
GAI Consultants Inc.
Pittsburgh, PA
GAI Consultants, Inc. is an engineering and environmental consulting firm with over 50 years of experience delivering innovative engineering solutions in energy, transportation, real estate, water, municipal, government, and industry.