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EnvironmentalStats for S-PLUS, an add-on module to S-PLUS, is a comprehensive software package for environmental scientists, engineers and regulators. It provides a series of functions for performing graphical and statistical analyses of environmental data, including parameter and quantile estimation, methods for dealing with non-detects, power and sample-size calculations, prediction and tolerance intervals, and probabilistic risk assessment. It includes a hypertext help system that explains methods from the environmental literature and regulatory guidance documents, along with a glossary of commonly-used statistical and environmental terms. This user's manual provides the documentation for versions 1.0 and 1.1 of the EnvironmentalStats for S-PLUS module.