A web-based laboratory manual for an Environmental Engineering Laboratory is being developed. This paper presents an overview of the development and a summary of some formative assessment data collected during the initial phases of the project. The labware is intended to enhance student learning through the exposure to richer learning tools and advanced technologies by developing an interactive multimedia website for the laboratory, both before and after the actual experiment. For laboratories without the required equipment, the students can still investigate and link the theory, experimental methods, data collection, and analysis.