Each member of our staff proudly embraces the scientific standards, integrity, and ethics of the late Dr. Dade W. Moeller, an eminent scientist and educator in the fields of occupational and environmental health. 


Our company began operations in 1994 in Richland, Washington (near the U.S. Department of Energy's Hanford Site) with exceptional personal reputations in health physics (radiation protection) and nuclear safety analyses, focusing principally on protecting people and the environment.

In May 2016, Dade Moeller joined NV5 to integrate our safety & health, radiation protection, and environmental quality capabilities with NV5’s engineering, infrastructure, and program management resources. Our combined capabilities bring effective solutions to complex issues. We are now Dade Moeller, an NV5 Company. Learn more here.


We are more than 150 highly skilled professionals, including Certified Health Physicists, Certified Industrial Hygienists, Certified Safety Professionals, Professional Engineers, and others with environmental and safety certifications and licenses. Dade Moeller, an NV5 Company, employs more Certified Health Physicists than any other company in the United States.


We have offices in Richland, Washington (HQ); Gaithersburg, Maryland; Oak Ridge, Tennessee; and Las Vegas, Nevada. We also support two long-term contracts from project locations in Cincinnati, Ohio, and Port Allen, Louisiana. As an NV5 Company, we also now offer considerable reach-back through NV5's offices nationwide.


We have advanced degrees and national recognition in our areas of technical expertise. Our close connections with professional societies, prestigious associations, national laboratories, and academia provide us with access and input to the latest technical developments and expert opinions in our fields of endeavor.


We provide experienced consultants and technical field staff to protect people and the environment during operations involving hazardous materials. We support projects at all stages (pre-planning to closure) and of all durations (one day to multi-year). Since joining NV5 in 2016, we also now offer a wide variety of additional and complementary services in construction quality assurance, infrastructure, energy, environment, and program management.