Apex Companies, LLC
Environmental ServicesMaryland, United States1001-5000 Employees
Apex Companies, LLC is a national, multidisciplinary environmental consulting and engineering firm established in 1988, providing services across water resources, environmental management, ESG and resiliency, health and safety, compliance and assurance, and infrastructure projects. The company is based at 2101 Gaither Road, Suite 500, Rockville, Maryland 20850, United States. Apex operates across all 50 states and employs between 1,001 and 5,000 professionals, including scientists, geologists, engineers, technicians, and information management specialists. The firm has grown through acquisitions and partnerships, including the acquisition of Forsgren Associates, Inc. in November 2025, the acquisition of Water Science Associates in March 2023, and the acquisition of PBS Engineering and Environmental Inc. in March 2024, along with a partnership with Johnson Engineering announced in September 2024. It has earned industry recognition as an ENR All-Environmental firm top 13 and 68 in the ENR top 200 overall, and was named a 2026 Hot Firm by Zweig Group.