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- Five Winds International
West Chester
- Fluor Corp’
Media
- Flynn Environmental, Inc.
Pittsburgh
- GAI Consultants, Inc.
Berwyn, Homestead
- Gannett Fleming, Inc.
Many locations
- General Physics Corp.
Pottstown
- GEO-CENTERS
Philadelphia, Pittsburgh, State College
- GeoEnvironmental Consortium, Inc.
Pittsburgh
- Gilbane Building Company
Philadelphia
- Golder Associates
Conshohocken
- Greeley and Hansen
Philadelphia
- Greenhorne & O'Mara, Inc.
Mechanicsburg
- Greenman-Pedersen, Inc.
Camp Hill, Scranton
- Groundwater & Environmental Services, Inc.
Altoona, Exton, Warrendale
- Groundwater Sciences Corp.
Harrisburg
- GZA GeoEnvironmental, Inc.
Fort Washington
- Hatch
Pittsburgh
- Hatch Mott MacDonald Ltd.
Pittsburgh, Quakertown
- HDR, Inc.
King of Prussia, Pittsburgh
- R.K.R. Hess Associates, Inc.
East Stroudsburg
- Hillmann Environmental Group, LLC
Philadelphia, Pittsburg
- HNTB Companies
Philadelphia
- HRP Associates, Inc.
Harrisburg, Lancaster
- HSMM
State College
- Hulcher Services Inc.
New Oxford, Washington
- Angelo Iafrate Companies
Mechanicsburg
- ICF International, Inc.
Middletown
- Industrial Design & Construction
Moon Township
- Industrial Scientific Corp.
Oakdale
- Information Ventures, Inc.
Philadelphia
- Ionics Inc.
Bridgeville, Montgomeryville
- Jacobs Engineering Group Inc.
Conshohocken, Philadelphia
- Keating Group
Philadelphia
- L. Robert Kimball & Associates, Inc.
Coraopolis, Ebensburg, Harrisburg,
Pittsburgh, State College, West Chester
- Klein and Hoffman, Inc.
Philadelphia
- Kleinfelder, Inc.
Cranberry Township, Philadelphia, West Chester
- Kleinschmidt Associates
New Castle, Strasburg
- Pennsylvania Companies: L - R, S - Z.
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