Montrose Environmental Group Inc. provides environmental services principally in the United States. The company's operating segment consists Assessment, Permitting and Response; Measurement and Analysis; and Remediation and Reuse. Assessment, Permitting and Response segment provides scientific advisory and consulting services to support environmental assessments, environmental emergency response and environmental audits. Measurement and Analysis segment tests and analyzes air, water and soil to determine concentrations of contaminants, as well as the toxicological impact of contaminants on flora, fauna and human health. Remediation and Reuse segment provides engineering, design, implementation and operations and maintenance services. Montrose Environmental Group Inc. is based in Irvine, California.