Theresa Jehn-Dellaport

Theresa Jehn-Dellaport, P.G.

Founder and Principal

M.S. Groundwater Geology - Wright State University

B.S. Geology - University of Dayton, Ohio

720-524-4294 (ext. 301)

Theresa brings over 35 years of experience in groundwater and surface water evaluations, feasibility studies, large municipal water well design, aquifer storage and recovery, surface and groundwater rights studies, plans for augmentation, substitute supply plans, surface water hydrology studies, aquifer pump test analysis, monitoring well and water well design, construction and testing, and specification preparation for large municipal and domestic water supply wells. She also has extensive experience in directing large multidisciplinary technical staff, subcontractors and consultants.


  • Appointed by Governor Hickenlooper in March 2011 to serve a four-year term on the Colorado Board of Examiners of Water Well Construction and Pump Installation Contractors.

Expert Witness

  • Regularly provides expert testimony in Colorado Water Court Cases, has been asked by the State of Colorado to be an expert witness on behalf of the State at a hearing for revisions to the Water Well Construction Rules, November 9, 1999.


  • American Water Resources Association

  • Colorado Ground Water Association

  • National Ground Water Association

  • Colorado Water Congress

  • Rocky Mountain Association of Geologists

  • Wyoming Water Association


  • Professional Geologist 

    • Wyoming​

    • Nebraska

    • Tennessee