| | |
| Name of the Subsidiary | | State or Other Jurisdiction of Incorporation or Organization |
| |
Air, Water and Soil Laboratories, Inc. | | Virginia |
| |
Enthalpy Analytical, LLC | | Delaware |
| |
Montrose Environmental Solutions, LLC | | Delaware |
| |
ES Engineering Services, LLC | | Delaware |
| |
FRS Environmental Remediation, Inc. | | Florida |
| |
Montrose Air Quality Services, LLC | | Delaware |
| |
Montrose Measurements and Analytics, LLC | | Delaware |
| |
Montrose Services, LLC | | Delaware |
| |
Nautilus Environmental, Inc. | | California |
| |
Envirosystems, Incorporated | | New Hampshire |
| |
Leymaster Environmental Consulting, LLC | | California |
| |
PARS ENVIRONMENTAL, Inc. | | New Jersey |
| |
Advanced GeoServices Corp. | | Pennsylvania |
| |
Montrose Planning & Permitting, LLC | | Delaware |
| |
Analytical Environmental Services | | California |
| |
Environmental Planning Specialists, Inc. | | Georgia |
| |
Montrose Waste-to-Resources, LLC | | Delaware |
| |
Montrose Water and Sustainability Services, Inc. | | Delaware |
| |
Target Emission Services USA, LLC | | Texas |
| |
1203524 B.C. Ltd. | | British Columbia |
| |
Target Emission Services Inc. | | Alberta |
| |
LEHDER Environmental Services Limited | | Ontario |
| |
Emerging Compounds Treatment Technologies, Inc. | | Massachusetts |
| |
Montrose Foreign Holdings, Inc. | | Delaware |
| |
The Center for Toxicology and Environmental Health, L.L.C. | | Arkansas |
| |
CTEH Leasing, LLC | | Arkansas |
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CTEH Properties, LLC | | Arkansas |
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CTEH Government Services, LLC | | Arkansas |
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CTEH IT Services, LLC | | Arkansas |
