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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.





The Nielsen Environmental Field School specializes in instructing practical, hands-on environmental field courses specifically designed to meet the continuing education needs of practicing environmental professionals.  For the past 20 years, The Field School has offered the most highly rated environmental field courses available anywhere in the world, including The Complete Ground-Water Monitoring Field Course, The Complete Ground-Water Sampling Field Course, The Environmental Sampling Field Course, The Complete Surface Water and Sediment Sampling Field Course, and The Complete Ground-Water Monitoring Well Design, Construction and Development Field Course

Courses are offered on an open-enrollment basis in the Spring and Fall of each year; these courses and custom-designed field courses can also be instructed on an on-site basis, a very cost-effective option for groups of 10 or more people.  All courses are approved for continuing education credit for professionals seeking credit from a number of state registration/certification/licensing programs, including Massachusetts LSPs, Connecticut LEPs, Texas CAPMs, West Virginia LRSs, Ohio VAP CPs, Oklahoma RCs, Pennsylvania PGs, Texas PGs, California REAs and many others.  The Field School's principal instructors, David M. Nielsen, C.P.G., C.G.W.P., P.Hg., and Gillian L. Nielsen, together have more than 60 years of practical field experience and more than 55 years of International teaching experience to share with students in the relaxed and enjoyable atmosphere offred at each course.  Visit for more information on field courses (descriptions, outlines and testimonials), the current course schedule, instructor biographical sketches and course registration.


Princeton Groundwater, Inc. is not affiliated with Princeton University