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Microbiological and Chemical Exposure Assessment Staff

Larry Wymer

Title: Mathematical Statistician

EPA Division: Microbiological and Chemical Exposure Assessment Research Division

EPA Branch: Microbial Exposure Research Branch

Larry’s research has focuses on improving recreational water monitoring methods and statistical techniques, understanding the spatial and temporal dispersion of indicator organisms in the waterbody, and developing a sound framework by understanding risk relationships involved in water contact. Another area of research is in collaborative study design, working with organizations to improve standards for validating new chemical and microbiological methods for water monitoring. He also provides statistical support for various MCEARD projects, which recently have included fate and transport of the qPCR signal through waste water treatment to source, development of immunoassay using saliva samples to assess exposure to waterborne pathogens, virus recoveries using various concentration and adsoption techniques, and infectivity of viruses among diverse cell lines.


  • M.B.A. Quantitative Analysis, University of Cincinnati, 1978
  • B.S. Physics, Case Western Reserve University, 1970

Professional Experience:

  • Mathematical Statistician, USEPA, ORD, NERL-MCEARD, Cincinnati, OH 1998-present
  • Sr. Statistician, Lockheed Martin, Cincinnati, OH 1996-1998
  • Sr. Statistician, DynCorp, Cincinnati, OH 1994-1996
  • Section Manager, Computer Sciences Corporation, 1987-1994

Professional Societies and Affiliations:

  • ASTMI, international standards organization

Select Awards and Honors:

  • NERL Special Recognition Award, Recreational Waters Research Team, 2011
  • USEPA STAA Awards, Level III, 2010
  • NERL Special Achievement Award, 2010
  • Exceptional/Outstanding Technical Assistance to the Regions/Program Offices, 2008
  • Bronze Medal for Commendable Service, 2007
  • Scientific and Technical Achievement Award, Level 1, 2006
  • Bronze Medal for Commendable Service, 2002
  • Scientific and Technical Achievement Award, Level 1, 2000

Select Presentations:

  • Wymer, L.J. Challenges in sampling for effective monitoring of bathing beach waters, Public Health and Water Monitoring AIDIS-USEPA, XXXII Inter-American Congress on Sanitary and Environmental Engineering AIDIS, Punta Cana, Dominican Republic, November 9, 2010 (Invited)
  • Wymer, L.J. Water sampling and criteria-setting: qPCR vs. traditional methods, Water and Health: Where Science Meets Policy, University of North Carolina, Chapel Hill, NC, October 24, 2010
  • Wymer, L.J., Haugland, R.A. Performance and sources of uncertainty in the Enterococcus qPCR test method for recreational water quality” Water and Health: Where Science Meets Policy, University of North Carolina, Chapel Hill, NC, October 24, 1010
  • Wymer, L.J., Haugland, R.A., Paar, J., Doolittle, M., Oshima, K. Evaluation of holding time of freshwater and marine samples for qPCR analysis, National Beaches Conference, Huntington Beach, CA, April, 2009
  • Wymer, L.J. Statistical Framework for Recreational Water Quality Criteria and Monitoring, a New Title in the John Wiley & Sons Series, ‘Statistics in Practice’, 7th Annual Great Lakes Beach Association Meeting, Traverse City, MI, October, 2007
  • Wymer, L.J. The EMPACT Beaches Project – A Study of Parameters that Affect Microbiological Monitoring of Recreational Water, Bacteria/Microbe EPA Region 10 Conference, sponsored by the Washington State Department of Ecology and the US Environmental Protection Agency, Tacoma, WA., May 2007
  • Wymer, L.J., McGee, C., Dufour, A.P. Temporal Variability of Microbial Indicators of Fecal Contamination at Marine and Freshwater Beaches, American Society for Microbiology Annual Meeting, Toronto, ON, May, 2007
  • Wymer, L.J., Dufour, A.P., Calderon, R.L., Wade, T.J., Beach, M., Haugland, R.A., Sams, E., Brenner, K.R. Comparison of Illness Endpoints in Swimmers’ Health Studies, National Beaches Conference, Niagara Falls, NY, October 11-13, 2006
  • Wymer, L.J. How Often and Where to Monitor: Outcome of the EMPACT Study, National Beaches Conference, San Diego, CA, October 13-15, 2004
  • Wymer, L.J. Sampling design for assessing recreational water quality, The International Environmetrics Society Annual Meeting, TIES 2001, August 13-17, 2001, Portland, OR, Presenter and Session Chair
  • Wymer, L.J. Dufour, A.P. A model for estimating the incidence of swimming-relating gastrointestinal illness as a function of water quality indicators, The Fourth International Conference on Environmetrics and Chemometrics, Las Vegas, NV, September 18-20, 2000

Published & Presented Research (1999-Present)

Contact Info:

Larry Wymer
Microbiological and Chemical Exposure Assessment Research Division
National Exposure Research Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
27 W. Martin Luther King Jr. Drive
Cincinnati, OH 45268
Telephone: 513-569-7252

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