The following organizations represent the complete list of affiliated companies of GZA GeoEnvironmental, Inc.

Melick-Tully and Associates, P.C. (MTA), based in South Bound Brook, New Jersey, is now a division of GZA.  Together, MTA and GZA provide clients with comprehensive... more
As of Saturday, May 28, 2016, the Principals and entire staff of Rose and Westra, Inc. of Grand Rapids, MI have joined the GZA team.  They are based in Grand Rapids, Michigan... more
  Huff & Huff, Inc. (a subsidiary of GZA GeoEnvironmental, Inc.), based in Oak Brook, Illinois, is a multi-disciplined consulting engineering firm providing environmental... more
  Laurel Oil and Gas Corp. is a respected leader in project management and consultancy services for oil and gas operators.  For more than 20 years, Laurel has provided... more
  Since 1986 New England Bioassay, a Division of GZA GeoEnvironmental, has been one of the leading ecological and whole effluent toxicity testing laboratories in the... more
  AirLogics, LLC was formed in 1998 as a joint venture between South Jersey Industries and GZA GeoEnvironmental, Inc. to provide comprehensive perimeter air monitoring... more