About People

Stephen Thomas

Stephen Thomas, PG, LHG


Stephen is Shannon & Wilson's lead hydrogeologist with 20 years of experience in groundwater resources, environmental and engineering consulting. He is responsible for managing and performing technical aspects of hydrogeological investigations for groundwater resources development, wellhead protection and groundwater management, groundwater contamination and waste disposal, dewatering, and environmental projects. Specific technical responsibilities include resource evaluation, well design, aquifer testing and analysis, water quality monitoring, analytical and numerical groundwater flow and contaminant modeling, water rights assessment, site characterization, and dewatering system design.


  • MSc, Hydrogeology, The University of Birmingham (United Kingdom), 1991
  • BSc, Geology, University College, Cardiff (United Kingdom), 1987


  • Registered Geologist and Hydrogeologist, Washington, California


  • American Water Resources Association - Past Washington State Board Member
  • American Water Works Association
  • National Groundwater Association
  • Groundwater Resources Association of California
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