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- Lancaster Laboratories
Lancaster
- Langan Engineering and Environmental Services, Inc.
Philadelphia, Warrington
- Larson Design Group, Inc.
Bloomsburg, Selinsgrove, Williamsport
- Layne Christensen Co.
Butler
- LECG
Wayne
- Leggette, Brashears and Graham, Inc.
West Chester
- P. Joseph Lehman, Inc.
Hollidaysburg
- Light-Heigel & Associates, Inc.
Halifax, Lancaster, Montandon, Palmyra,
Schuylkill, Wernersville, West Chester
- Los Alamos Technical Associates, Inc.
Philadelphia
- MACTEC, Inc.
Erie, Pittsburgh, Plymouth Meeting
- Maguire Group
Harrisburg, Philadelphia, Pittsburgh, State College
- MARCOR Remediation, Inc.
Downingtown
- McCormick Taylor
Ebensburg, Harrisburg, Malvern,
Philadelphia, Pittsburgh, State College
- McTish, Kunkel & Associates
Allentown, Montoursville, Rostraver
- Metcalf & Eddy
Philadelphia, Pittsburgh
- Microbac Laboratories, Inc.
Camp Hill, Erie, New Castle,
Warrendale, Wexford
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