The Nielsen Environmental Field School was created in 1990 in response to a demand from the environmental industry for practically oriented, hands-on environmental field training. The Nielsen Environmental Field School’s principals and key instructors, David M. Nielsen and Gillian L. Nielsen, possess a unique combination of more than 50 years of field experience and 45 years of international teaching experience.

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The National Ground Water Association is the hallmark organization for anyone associated with the ground water industry.

We're headquartered in Westerville, Ohio. Our constituency consists of ground water geologists and hydrologists, engineers, ground water contractors, manufacturers, and suppliers of ground water-related products and services.

We also have voluntary certification programs in well construction and pump installation as well as one for ground water professionals (scientists and engineers). The well construction and pump installation program is so respected it is used by some states for licensing.

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Princeton Groundwater, Inc. is not affiliated with Princeton University