7NT is a highly specialized geotechnical firm heavily involved in the design and construction of deep tunnels. These tunnels are used as massive storage facilities in the water and wastewater treatment industries as well as transportation conduits through mountains and under streams.

7NT was formed in 2008 by Pratap Rajadhyaksha, PE, a 45-year veteran of the engineering/construction industry. After graduating from MIT, Pratap spent the first 30 years of his professional career helping to build one of the largest privately held engineering firms in the Midwest. Upon leaving the firm, Pratap formed 7NT in order to practice his specialty, water/wastewater engineering, particularly as related to the control of combined sewer overflows (CSO).

7NT has 65 professional and technical staff members specializing in complex drilling, laboratory services, geotechnical engineering, civil engineering, environmental services, surveying, construction management/inspection (QA), materials testing, manhole rehab, and sewer repair. Due to the highly specialized nature of our services, 7NT personnel are invited to work on complex projects nationwide.