Kathryn Johnson

Kathryn Johnson

Kathy has nearly 40 years of consulting experience applying geochemistry and geohydrology to environmental investigation, assessment, compliance, and permitting. Her experience includes data collection and analysis, along with geochemical modeling to understand baseline concentrations, contaminant fate and transport, mitigation of acid rock drainage (ARD), water treatment, and remedial designs. She is experienced in navigating the regulations of the U.S. Environmental Protection Agency (EPA), state agencies and the National Environmental Policy Act (NEPA). Her projects have involved soil, groundwater and surface water, mine waste, hazardous and solid waste, radioactive materials, and landfills. Kathy has provided support in legal disputes of liability, cost allocation, insurance coverage, and toxic tort. In addition, she has served as an expert witness and given trial testimony.



Senior Geochemist


PhD, Geology, South Dakota School of Mines and Technology

MS, Chemistry, Iowa State University

BS, Chemistry, Black Hills State University


Barr Engineering Co.
4300 MarketPointe Drive
Suite 200
Minneapolis, MN 55435
Phone: +1 952-832-2833