Public engineering firm profile
Westerville, OH
Creating Sensible, Sustainable Engineered Solutions.
Otisco Engineering Ltd. is a Westerville, Ohio-based owner-operated mechanical and environmental engineering consultancy founded in 2009 by Gregory J. Nortz, P.E., MBA. It spans a wide range of disciplines including HVAC design, geothermal system engineering, stormwater management, stream and wetland restoration, wastewater treatment, and underground utilities. Nortz is the inventor of the Otisco Ground-Loop System, a patented minimally invasive geothermal installation technology and recipient of a USDA Small Business Innovation Research (SBIR) grant. He holds PE licensure in eight states and has worked on projects ranging from commercial buildings to NASA's International Space Station.
HVAC design and installation, plumbing, hydraulic systems, and geothermal heating and cooling solutions for residential and commercial buildings.
Design and installation of residential and light commercial geothermal ground-loop systems using the proprietary Otisco Ground-Loop System, which uses horizontal directional drilling to minimize surface disturbance.
Stormwater management, green infrastructure design, stream and wetland restoration, landfill engineering, and environmental monitoring.
Groundwater monitoring, septic and sewage treatment system design, erosion protection, and site restoration.
Design and management of fuel systems, natural gas pipelines and regulator stations, and leachate and gas collection systems.
End-to-end management ensuring adherence to scope, schedule, budget, and quality across all engineering disciplines.
Cleveland, OH | NASA Glenn Research Center | Federal / NASA
Design and construction management of a stormwater bioswale at NASA Glenn Research Center redirecting parking lot and roadway runoff through a vegetated filter channel. Incorporated native Ohio plant species, a bioretention cell, riprap forebay, underdrain piping, and hardwood mulch finish.
View project sourceOhio | Residential
Complete design-build of a residential geothermal heating and cooling system using the Otisco Ground-Loop System. Used horizontal directional drilling to install ground loops with minimal surface disturbance, no open trenching required. Handled system sizing, CAD manifold design, field layout, HDD coordination, and commissioning.
View project sourceOhio | Heritage Classical Academy | Education
Full engineering design and permitting for a 10,000 GPD wastewater treatment plant upgrade. New design included aerated sludge holding tank, surface sand filter with force main distribution, post-aeration disinfection, and upgraded sand filter dosing tank. Ohio EPA sewerage approval obtained.
View project sourceMedina County, OH | Hinckley Township | Government & Municipal
Full design and permitting of a wastewater treatment plant upgrade. New system includes flow equalization tank, trash trap, and aeration/clarifier system discharging to a tributary of the East Branch of the Rocky River. Ohio EPA and NPDES Permit #3PR00500 secured.
View project sourceOhio | National Park Service | National Parks & Environmental Preservation
Comprehensive environmental restoration for the National Park Service. Site is flourishing 6-7 years post-construction.
View project sourceNASA | Federal / NASA
Precision temperature sensor design for the Active Thermal Control System (ATCS) aboard the International Space Station.
View project sourceOhio | National Parks & Environmental Preservation
Irrigation canal closure designed to block aquatic nuisance species migration pathways.
View project sourceP.E., MBA - Owner
Mechanical engineer with decades of experience across HVAC, hydraulic systems, aerospace sensors, and environmental engineering. Inventor of the patented Otisco Ground-Loop System and Coriolis mass flowmeter. Designed the ATCS temperature sensor for the International Space Station. B.S. Mechanical Engineering, Cleveland State University; MBA, Clemson University. Managed 50+ commercial HVAC installations.
white_paper | Gregory J. Nortz
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