Mary Schoen

Affiliate Assistant Professor, Env. and Occ. Health Sciences (Primary department)
Mary Schoen joined Soller Environmental after completing a post-doctoral research position with the US EPA. While with the EPA, Mary developed risk assessment and sustainability assessment tools for natural and engineered water systems. Her work helped to establish the scientific foundation for the development of new 2012 Draft National Ambient Water Quality Criteria. She was awarded the National Exposure Research Laboratory Special Achievement Award in 2010 for this work.

Mary Schoen holds a Doctorate degree in Engineering and Public Policy and a Masters degree in Civil and Environmental Engineering from the Carnegie Mellon University, and a Bachelors degree in Civil and Environmental Engineering from Bucknell University. Dr. Schoen serves as a peer reviewer for Environmental Science & Technology, Water Research, Risk Analysis, Plos One and the US EPA Office of Water and Office of Research & Development. She has been invited as an expert in the area of quantitative microbial risk assessment to multiple meetings and has contributed to many peer reviewed articles.

Research Interests

  • Conducting sustainability assessments of engineered water systems including risk, resilence and environmental assessments. Conducting quantitative microbial risk assessment for cnoventional and alternative drinking and wastewater treatment and reuse options at the community and household levels.

Teaching interests

Quantiative Microbial Risk Assessment


PhD, Engineering and Public Policy, Carnegie Mellon University, 2008
MS, Civil and Environmental Engineering, Carnegie Mellon University, 2006
BS, Civil and Environmental Engineering, Bucknell University, 2003


Microbial Risk Assessment of Recreational Waters. Conducted high-priority research that underpins the 2012 Draft National Ambient Water Quality Criteria. Developed the stochastic water quality model used to predict pathogen densities and risks in recreational waters for the 2012 Draft National Ambient Water Quality Criteria. Reviewed and analyzed large datasets of scientific data to create probabilistic distributions for the model input parameters. Conducted probabilistic quantitative microbial risk assessment to rank the human health risks associated with ingesting contaminated recreational waters. Released the resulting R computer code to Office of Water for additional studies. Prepared and presented risk-based recommendations to the Office of Water on assessing risk for waters impacted by a mixture of sources as well as animal-impacted waters for the 2012 Recreational Water Quality Regulations.
Review date: