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The Largest Environmental Consulting and Engineering Companies on the Internet

These firms are the largest environmental consulting and/or engineering firms on the world wide web. For engineering and environmental consulting firms to qualify for this list a company must have 200 or more employees or more than $15,000,000 in annual sales from design/consulting services. If your firm wishes to be considered for this list, please send me e-mail.
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ABB Environmental

AG&W Environmental Engineering Co., L.P

Arthur D. Little, Inc.


ATC Group Services Inc.

The Austin Co., Cleveland, Ohio

Barr Engineering

BDM Environmental

Beak International, Inc.-


Black & Veatch

Blasland Bouck & Lee

Booz Allen & Hamilton, Inc.

Braun Intertec Corp.

Brown and Caldwell

Brown & Root Environmental

Burns & McDonnell Engineering

Camp Dresser & McKee

Carter & Burgess, Inc.

CET Environmental


Clayton Environmental

Clean Air Engineering

Clough Harbour & Associates

CTL Engineering Inc

Dames & Moore Group (See URS)

Dewberry & Davis

Dufresne-Henry, Inc

Erdman Anthony

EA Engineering, Science & Technology

Earth Tech

Ecology & Environment, Inc.


EnSafe Inc.

ENSR, Inc.

ENVIRON International Corporation

ERM, Inc.

Flack + Kurtz.

Fluor Daniel, Inc.

Foster Wheeler Corporation

Foster Wheeler Environmental Corporation

Geraghty and Miller

Ghafari Associates Inc.

Golder Associates

Greeley and Hansen

Greenhorne & O'Mara Inc

GZA Environmental Inc.

Haley & Aldrich.

Halliburton Company

Hammel Green and Abrahamson Inc.

Hanson Engineers Inc .

Harding Lawson Associates, Inc.

Hart Crowser, Inc.

Haley & Aldrich

Harza Engineering Co.

HDR Engineering, Inc.

Hellmuth Obata & Kassabaum Inc

Heritage Environmental Services Inc.

ICF Kaiser Engineers.

IT Corporation

Jones & Stokes Associates

Killam, Inc.

Kleinfelder, Inc.

Langan Engineering & Environmental Services Inc

Law Companies Group

Lawler, Matusky & Skelley Engineers


Malcolm Pirnie, Inc.

McKim & Creed

McLaren-Hart Home Page

Metcalf & Eddy

Michael Baker Corp.

Montgomery Watson

Morrison Knudsen Corp

Mustang Engineering Inc.

Nolte and Assocs Inc

NTH Consultants

O'Brien & Gere, Inc.

O'Donnell Wicklund Pigozzi and Peterson,

Parametrix Inc.,

Parsons Brinckerhoff Inc.

Parsons Engineers and Constructors

Paulus Sokolowski and Sartor, Inc.

Post, Buckley, Schuh, Jernigan

Professional Service Industries, Inc.

Radian Corporation

Raymond Professional Group Inc

Raytheon Engineers & Constructors

RMT Inc.

Robert Bein, William Frost & Associates (RBF)

Roy F. Weston

RTKL Associates, Inc.

Science Applications International Corporation(SAIC)

Sargent & Lundy

SCS Engineers - Environmental Consultants

The Sear-Brown Group

Secor International, Inc.


Stearns & Wheler

Stone & Webster

STS Consultants Ltd

STV Group Inc.

TAMS Consultants, Inc.

The Terracon Companies, Inc.

Tetra Tech, Inc.

TRC Companies, Inc.


Versar, Inc.

Walker Parking Consultants

Wilson & Co

Wiss Janney Elstner Associates, Inc.

Woodward-Clyde Group (See URS)

Woolpert LLP