Tonia Johnson

Tonia Johnson

Tonia has nearly 15 years of experience solving complex problems for manufacturing, mining, power, and private sector clients. Her experience as a senior geologist and project manager includes projects with a unique blend and depth of services. These services included surface water and groundwater hydrology, hydrogeology, water supply, vapor intrusion, engineering support, environmental due diligence, environmental investigation, remediation, and brownfield redevelopment. Contaminants of concern for these projects have included per- and polyfluoroalkyl substances (PFAS), agriculture-related chemicals, petroleum-related compounds, and chlorinated solvents.



Senior Geologist


Professional Geologist (CA)


BA, Geology, University of St. Thomas


Barr Engineering Co.
234 West Century Avenue
Bismarck, ND 58503
Phone: +1 701-221-5432

Related projects

Landfill-gas monitoring at remediated dump to support brownfield redevelopment
Groundwater compliance assistance for CCR Rule