Larry Wymer, Mathematical Statistician, US Environmental Protection Agency. Mr Wymer has been involved with recreational water criteria for the past six years, and has published numerous papers in many international journals in this field.

• Contributors viiPreface ix1 The evolution of water quality criteria in the United States, 1922–2003 1Alfred Dufour and Stephen Schaub2 A management context for the statistical design of recreational contact water quality monitoring programs 13Stephen B. Weisberg3 Conceptual bases for relating illness risk to indicator concentrations 19D.F. Parkhurst, G.F. Craun, and J.A. Soller4 On selecting the statistical rationale for revised EPA recreational water quality criteria for bacteria 45Richard O. Gilbert5 Sampling recreational waters 69A.H. El-Shaarawi and S.R. Esterby6 The lognormal distribution and use of the geometric mean and the arithmetic mean in recreational water quality measurement 91Larry J. Wymer and Timothy J. Wade Copyrighted Material7 The EMPACT beaches: a case study in recreational water sampling 113Larry J. Wymer8 Microbial risk assessment modeling 135Graham McBride9 A plausible model to explain concentration – response relationships in randomized controlled trials assessing infectious disease risks from exposure to recreational waters 153Albrecht Wiedenmann10 Nowcasting recreational water quality 179Alexandria B. Boehm, Richard L. Whitman, Meredith B. Nevers, Deyi Hou, and Stephen B. Weisberg11 Statistical sensitivity analysis and water quality 211Alessandro FassòIndex 231

"The book provides useful information on specific topics." (Journal of the American Statistical Association, June 2009) "The book is a good source for graduate students and researchers who want to get a broad overview of statistical problems and proposed solutions based on current research on recreational water quality." (Journal of Environmental Quality, August 2008)