Onterris

About Onterris

Onterris is a publicly traded global environmental solutions company (NYSE: ONT) that serves private and public sector clients across asset- and resource-intensive industries, including chemical, energy, government, infrastructure, manufacturing, mining, solid waste, transportation, and technology. Formerly known as Montrose Environmental Group, the company rebranded in April 2026 to consolidate several entities — including ECT2, CTEH, Enthalpy Analytical, and Epic Environmental — under a single, unified brand. Operating across more than 100 offices in the United States, Canada, and Australia, and employing approximately 3,500 professionals, Onterris delivers services across four primary areas: contaminated land and remediation; permitting, compliance, and regulatory advisory; testing and analysis (including air emissions, stack testing, and laboratory services); and water consulting, testing, and treatment. The company also offers emergency planning, preparedness, response and recovery services, natural resources management, and treatment technologies for persistent contaminants such as PFAS. Its clients span more than 6,100 organizations. Onterris describes its approach as systems thinking — using science, data, and field execution to help clients manage environmental and operational risk at the intersection of regulatory expectations and business performance. In 2025, the company reported record annual revenues of approximately $830.5 million, growing 19.3% year-over-year, primarily through organic growth and a sustained acquisition strategy of more than 70 companies over its history. environmental consulting, environmental services, remediation, contaminated land, air quality, emissions testing, PFAS, water treatment, regulatory compliance, EHS, environmental testing, industrial environmental services, emergency response, natural resources