Senior Scientists

Kathleen A. Radloff, Ph.D. Bio PDF Contact/vCard


Ph.D. Earth and Environmental Engineering, Columbia University

B.A. Chemistry, Mount Holyoke College

Water Science and Policy Certificate International Women's University (Germany)


  • Contaminant Fate & Transport
  • Aqueous Geochemistry
  • Lead, Arsenic, and Metals
  • Groundwater Hydrology
  • Risk-based Remediation

    Kathleen A. Radloff, Ph.D.

    Senior Environmental Engineer

    Dr. Radloff is an environmental engineer specializing in the geochemistry, fate, and transport of environmental contaminants.  Dr. Radloff has used her technical expertise for  the characterization of contaminated aquifers, risk-based exposure assessment, site remediation, environmental liability assessment, and litigation support.  She has experience with a wide range of contaminants including trace metals, pesticides, chlorinated solvents, and PCBs.  Her doctoral work focused on arsenic fate and transport in Bangladesh and specifically investigated how arsenic mobility restricted viable drinking water options in rural areas.  Prior to graduate school, Dr. Radloff worked on human health risk and exposure assessment as an environmental health analyst at Gradient.

    Representative Projects

    Hydraulic Fracturing Fluids Constituents Evaluation:  As part of an evaluation of the potential for hydraulic fracturing (HF) of deep shale formations to affect potable aquifers, reviewed various state guidelines of drilling activities and the incidence of spills and violations.  Performed preliminary review of several HF additives and their anticipated mobility in the subsurface. 

    Groundwater Modeling for Conceptual Remedy Design:  In support of on-going remediation activities, assessed the current remediation performance of a chlorinated solvent plume.

    TCE Groundwater Data Review:  Reviewed groundwater sampling and remediation activities conducted for over 30 years at a site contaminated with chlorinated solvents.  Compared the methods in use to then-current practices.

    Barite Mining Risks Evaluation:  Evaluated contaminants in soil, surface water, and sediment to facilitate a remedial strategy at a former mining site contaminated with metals. After extensive data collection, developed a conceptual site model and conclusively demonstrated that many elevated concentrations were the result of background conditions and not due to mining operations.  The characterization report and accompanying risk assessment will be submitted to several regulatory agencies for their review.

    Source Investigation of Lead in Mining Runoff: Provided litigation support concerning levels of metals in groundwater and drinking water in a coal mining region.  Specifically determined that metals observed in drinking water were characteristic of naturally occurring levels in that area.

    Selected Publications

    van Geen, A; Bostick, BC; Trang, PTK; Lan, VM; Mai, NN; Manh, PD; Viet, PH; Radloff, K; Aziz, Z; Mey, JL; Stahl, MO; Harvey, CF; Oates, P; Weinman, B; Stengel, C; Frei, F; Kipfer, R; Berg, M.  2013. "Retardation of arsenic transport through a Pleistocene aquifer." Nature 501 : 204-207.

    Radloff, KA; Zheng, Y; Michael, HA; Stute, M; Bostick, BC; Mihajlov, I; Bounds, M; Huq, MR; Choudhury, I; Rahman, MW; Schlosser, P; Ahmed, KM; van Geen, A.  2011. "Arsenic migration to deep groundwater in Bangladesh influenced by adsorption and water demand." Nat. Geosci. 4 : 793-798.

    van Geen, A; Radloff, KA; Aziz, Z; Cheng, ZQ; Huq, MR; Ahmed, KM; Weinman, B; Goodbred, S; Jung, HB; Zheng, Y; Berg, M; Trang, PTK; Charlet, L; Metral, J; Tisserand, D; Guillot, S; Chakraborty, S; Gajurel, AP; Upreti, BN.  2008. "Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and Nepal." Appl. Geochem. 23 : 3244-3251.

    Radloff, KA; Cheng, ZQ; Rahman, MW; Ahmed, KM; Mailloux, BJ; Juhl, AR; Schlosser, P; van Geen, A.  2007. "Mobilization of arsenic during one-year incubations of grey aquifer sands from Araihazar, Bangladesh." Environ. Sci. Technol. 41 : 3639-3645.