Established in 1975, RJN Group Inc. is a consulting firm that provides engineering services and information technology services for infrastructure planning, design, construction, maintenance, and management. Based in Wheaton, Ill., it serves a variety of clients, including municipal, county, state and federal agencies, and sanitary districts. The representative projects include comprehensive assessment, preliminary and detailed design, construction engineering and ongoing maintenance management for infrastructure systems including water, sewer, drainage, and transportation. The Computer Aided Support System, called CASS WORKS, is an integrated approach to the computerized management of sewer, water, drainage, pavement, and treatment plants.

Website: rjn.com

Phone: (630) 682-4700

Cross Streets: Near the intersection of Warrenville Rd and Authority Dr