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Private company

Montrose Environmental Group

American multinational environmental company

Onterris, Inc. (commonly shortened to Onterris), formerly Montrose Environmental Group, is an American multinational corporation that provides wide-ranging environmental services.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

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Onterris, Inc. (commonly shortened to Onterris), formerly Montrose Environmental Group, is an American multinational corporation that provides wide-ranging environmental services.2

Corporate structure

Montrose Environmental Group is part of a group headed by Onterris, Inc.. 22 entities, 3 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Onterris, Inc. North Little Rock, Arkansas, United States
    • Montrose Environmental Group
    • Emerging Compounds Treatment Technologies, Inc. Subsidiary · Massachusetts, United States
    • Enthalpy Analytical, LLC Subsidiary · Delaware, United States
    • Environmental Standards, Inc. Subsidiary · Pennsylvania, United States
    • Epic Environmental Pty Ltd Subsidiary · Australia
    • FRS Environmental Remediation, Inc. Subsidiary · Florida, United States
    • Montrose Air Quality Services, LLC Subsidiary · Delaware, United States
    • Montrose Environmental Solutions Canada Inc. Subsidiary · Alberta, Canada
    • Montrose Environmental Solutions, Inc. Subsidiary · Delaware, United States
    • Montrose Foreign Holdings, Inc. Subsidiary · Delaware, United States
    • Montrose Government Solutions, Inc. Subsidiary · Delaware, United States
    • Montrose Measurements and Analytics, LLC Subsidiary · Delaware, United States
    • Montrose Services, LLC Subsidiary · Delaware, United States
    • Montrose Water and Sustainability Services, Inc. Subsidiary · Delaware, United States
    • MSE Group, LLC Subsidiary · Texas, United States
    • PARS Environmental, Inc. Subsidiary · New Jersey, United States
    • SensibleIOT, LLC Subsidiary · California, United States
    • Spirit Environmental, LLC Subsidiary · Texas, United States
    • Sustainable Treatment Solutions, Inc. Subsidiary · New York, United States
    • The Center for Toxicology and Environmental Health, L.L.C. Subsidiary · Arkansas, United States
    • Two Dot Consulting, LLC Subsidiary · Colorado, United States

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC. Each entity in the chart links to its source.

Sources

The numbers on this page point here. Each one links to the record it came from.

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