Marvin GlotfeltyMarvin F. Glotfelty, P.G.

Principal Hydrogeologist

Scottsdale, Arizona


(480) 659-7131

Marvin Glotfelty, RG, is a Principal Hydrogeologist with more than 35 years of professional experience. He has experience in almost every aspect of hydrogeology, water supply studies, aquifer testing, well design, well rehabilitation, water rights issues, and water quality assessment, including groundwater resources investigations, well siting studies, well design and construction management, evaluation and rehabilitation of water wells, and water supply studies. He has been involved with the design, installation, rehabilitation, and abandonment of about 1,000 water wells in the United States.

Mr. Glotfelty has provided litigation support related to water well, hydrogeologic, and hydrologic evaluations; served as a Forensic Consultant; and provided direct expert and rebuttal testimony in deposition, mediation, and adjudication hearings and before the Arizona Superior Court and United States District Court. He has also provided litigation support services for water well-related cases in California, Oklahoma, Georgia, and Oregon. Mr. Glotfelty has provided litigation support to a wide range of clients including municipalities, attorneys, chemical companies, drillers, power companies, developers, utilities companies, and water agencies. He performed a comprehensive water resources evaluation for one of the largest rate cases for a private water company in the history of the State of Arizona. Specific tasks included submittal of reports as direct evidence, written rebuttal testimony, written surrebuttal testimony, written rejoinder testimony, and oral expert testimony and response to cross-examination.

Mr. Glotfelty has given over 100 presentations on hydrogeologic and water well topics and he has authored over 20 publications by the National Ground Water Association (NGWA) and others, including The Art of Water Wells (NGWA Press, 2019), Glossary of Driller’s Terms (NGWA Press, 2004), and editorial review of a chapter on Water Well Construction & Abandonment for the 3rd ed. Groundwater & Wells, published by Johnson Screens Co. (2007). In 1995, he received the City of Phoenix Mayor’s Environmental Award for his work with rehabilitation of municipal wells to improve their water quality, and he was selected as the National Ground Water Association’s Distinguished McEllhiney Lecturer for 2012.


  • Education

    M.S., Geology, Northern Arizona University

    B.S., Geology, Northern Arizona University

  • Registration / Certification

    Registered Geologist, Arizona, No. 22744

    Registered Geologist, California, No. 4988

    Licensed Well Driller, Arizona, Nos. 160 and 672

  • Specializations

    Groundwater resources investigations

    Well siting studies

    Well design and construction management

    Evaluation and rehabilitation of water wells

    Water supply studies

  • Affiliations

    Arizona Hydrological Society (AHS Foundation Board of Directors, 2009-20014; AHS Phoenix Chapter Board of Directors 1989-93 and Vice President, 1990-91).

    Arizona Water Well Association (Technical Director, 1990-present; Legislative Committee, 1993-present; Education Committee, 2000-present).

    National Ground Water Association, 1984-present