The least-squares method of enterohemorrhagic E. coli counts (log unit CFU/ml) in samples of phosphate buffer-treated and chemical-treated solution was analyzed using the general linear model of the Statistical Analysis System (SAS Institute, Cary, NC). The value used for statistical analysis when treatments with chemicals yielded undetectable enterohemorrhagic E. coli by the direct-plating method was 1.6 log CFU/ml. Data from cattle studies were analyzed using the General Linear Models procedure of SAS. Included in the statistical model were cow group, treatment, and period. In addition, data collected during the control week between experimental weeks were used as a covariant to adjust for individual differences in intake while the cows were receiving the control treatment. Only data collected after the cows had stabilized their intake following the first experimental week were used for covariant analysis. Analyses of total water intake and water intake per metabolic body weight (MBW) were conducted. Paired t tests were used for mean separation, and comparisons of means were only within significant F tests.