Geoff Siemering
Outreach Specialist & Lecturer
Phone
608.262.9969
Education
B.A. Geochemistry, Pomona College, Claremont, CA
M.S. Soil Science, University of California-Berkeley, Berkeley, CA
Ph.D. Civil Engineering, University of Portsmouth, UK
Oke, O.O., Magzamen, S., Siemering, G.S., Johnson, S.L., Auerbach, J.D., and Carter, E.M. Investigating patterns and sources of variability in children’s blood lead levels in Milwaukee, Wisconsin using a machine learning model. Submitted August 2025 to Environmental Research: Health.
Siemering, G.S. and Thomas A. Background concentration, risk assessment and regulatory threshold development: Metal elements in Milwaukee, Wisconsin surface soils. In preparation.
Siemering, G.S., Read H., Springer, B., Martensson, K., Seibert, R., Barak, P. Comparison of USEPA validated soil PAH extraction methodologies. In preparation.
Siemering G.S., Arriaga F.J., Cagle G.A., Van Beek J.M., Freedman Z.B. Impacts of vegetable processing and cheese making effluent on soil microbial functional diversity, community structure, and denitrification potential of land treatment systems. Water Environment Research. 2024 May;96(5):e11036.
Siemering G.S., Arriaga F.J., VanderLeest C.P., Naatz S.L. Evaluation of nitrogen fate from land-application wastewater treatment for cheese making and vegetable processing facilities. Environmental Science: Advances. 2024;3(1):51-61.
Siemering G.S., Vanderleest C.P., Arriaga F.J. Autonomous high-throughput in situ soil nitrogen flux measurement system. Environmental Monitoring and Assessment. 2022 Oct;194(10):680.
Siemering, G.S. and Thiboldeaux, R., 2021. Background concentration, risk assessment and regulatory threshold development: Polycyclic aromatic hydrocarbons (PAH) in Milwaukee, Wisconsin surface soils. Environmental Pollution, 268, p.115772.
Plunkett, S.A., Wijayawardena, M.A., Naidu, R., Siemering, G.S., Tomaszewski, E.J., Ginder-Vogel, M. and Soldat, D.J., 2018. Use of Routine Soil Tests to Estimate Pb Bioaccessibility. Environmental Science & Technology, 52(21), pp.12556-12562.
Geoffrey S. Siemering, Jennifer D. Hayworth, Ben K. Greenfield. 2008. Assessment of Potential Aquatic Herbicide Impacts to California Aquatic Ecosystems. Archives of Environmental Contamination and Toxicology 55(3): 415-431
Ben K. Greenfield, Geoffrey S. Siemering, Joy C. Andrews, Michael Rajan, Stephen P. Andrews, Jr., and David F. Spencer. 2007. Mechanical Shredding of Water Hyacinth (Eichhornia crassipes): Impacts to Water Quality in the Sacramento-San Joaquin River Delta, California. Estuaries and Coasts30: 627-640.
Siemering, Geoff. 2006. Technical Report for the Interagency Ecological Program (IEP) Pelagic Organism Decline (POD) Workgroup: Tier 1 Risk Assessment of California Department of Boating and Waterways Aquatic Herbicide Use in the Sacramento-San Joaquin River Delta. SFEI Contribution 436. San Francisco Estuary Institute, Oakland, CA.
Siemering, Geoff and Jennifer Hayworth. 2006. Aquatic Herbicides: Overview of Usage, Fate and Transport, Potential Environmental Risk, and Future Recommendations for the Sacramento-San Joaquin Delta and Central Valley. White Paper for the Interagency Ecological Program. SFEI Contribution 414. San Francisco Estuary Institute, Oakland, CA.
Nicole David, Ben K. Greenfield, Geoffrey S. Siemering. 2006. Evaluating Impacts of Lake Maid Plant Control. Journal of Aquatic Plant Management 44: 60-67.
Lingtian Xie, Kelly Thrippleton, Mary Ann Irwin, Geoffrey S. Siemering, David Crane, Kevin Berry, and Daniel Schlenk. 2005. Evaluation of Estrogenic Activities of Aquatic Herbicides and Surfactants Using a Rainbow Trout Vitellogenin Assay. Toxicological Sciences 87: 391-398.
Allen, P.G., G.S. Siemering, D.K. Shuh, J.J. Bucher, N.M. Edelstein, C.A. Langton, S.B. Clark, T. Reich and M.A. Denecke. 1997. Technetium Speciation in Cement Waste Forms Determined by X-ray Absorption Fine Structure Spectroscopy. Radiochimica Acta, 76: 77-86.
University of Wisconsin Extension Publications
The Value of Arbuscular Mycorrhizal Fungi for Field Crops (A414-01)
The Value of Bacillus amyloliquefaciens for Crop Protection (A4114-03)
The Value of Trichoderma for Crop Protection (A4114-02).
Managing Mine-scarred lands in Southwestern Wisconsin (G4173)
Digital Atlas of Historic Mining Features in Southwestern Wisconsin (G4177).
Sampling lawn and garden soils for analysis (A2166).
Lead in home garden soil (A4089).
Geoff began working with the UWEX state soil specialists at UW Madison in early 2014 as an outreach specialist. His research to date has encompassed contaminant metals, polycyclic aromatic hydrocarbons, pesticides (aquatic and neonicotinoid), radionuclides, nitrogen, phosphorus, and PFAS largely at the interface of science and environmental policy/regulation. He has also worked with communities on soil health issues in Guatemala, Peru, Colombia, and Namibia as a technical expert for the USAID Farmer to Farmer program. Currently he is working on projects involving soil lead in urban and rural areas, developing statewide anthropogenic polycyclic aromatic hydrocarbon baseline values, and soil denitrification of cheese making and vegetable processing wastewater. In addition, Geoff has served as an author and trainer for the ITRC Bioavailability of Contaminants in Soil training and author for the ITRC Soil Background and Risk Assessment.
SOIL SCI 430 Soil Pollution and Human Health
SOIL SCI 575 Assessment of Environmental Impact
INTER-AG 321 Study Abroad Pre-Departure Seminar
NUTR SCI/INTER-AG 421 Global Health Field Experience