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- Biogénie SRDC Inc.
Quakertown
- Black & Veatch
Philadelphia
- Blasland, Bouck & Lee, Inc.
Pittsburgh, West Conshohocken
- Boelter Associates, Inc.
Gettysburg
- Booz Allen Hamilton Inc.
Johnstown, Philadelphia
- Borton-Lawson
Bethlehem, Wilkes-Barre
- Buchart-Horn, Inc. / BASCO Associates
Pittsburgh, Pocono Summit, State College, York
- CAPE Inc.
Exton
- CDM
Lancaster, Philadelphia, Pittsburgh,
State College, Wayne
- CEI
Scranton
- CH2M Hill
Moon Township, Philadelphia
- Civil & Environmental Consultants, Inc.
Export, Pittsburgh
- Clean Air Engineering, Inc.
Pittsburgh
- Clean Harbors, Inc.
Philadelphia, Trooper
- Clough, Harbour & Associates LLP
Erie, Scranton, Worcester
- Commonwealth Engineering & Technology, Inc.
Harrisburg, Huntington, Trevose
- Concurrent Technologies Corp.
Johnstown, Mechanicsburg
- Conestoga - Rovers & Associates
Exton, Pittsburgh
- ConTech Services, Inc.
Broomall
- Converse Consultants
State College
- Criterion Labs, Inc.
Bensalem
- CTE
Erie, Pittsburgh
- Cubellis Inc.
Philadelphia, Wayne
- Delta Environmental Consultants, Inc.
Pittsburgh
- Devine Tarbell & Associates, Inc.
Dallastown
- Dewberry
Carlisle, Kimberton, McKees Rocks
- DMJM Harris
Harrisburg, Horsham, Philadelphia, Pittsburgh
- DPRA Inc.
Doylestown
- Dvirka and Bartilucci Consulting Engineers
Trevose
- Dynamac Corp.
Wayne
- Pennsylvania Companies: E - K, L - R, S - Z.
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