This autoinstructional lesson deals with the study of water pollution control. It is a learning activity directed toward high school students of biology and/or ecology. A general knowledge of microbiology techniques is regarded as a prerequisite for the lesson. Behavioral objectives are given. Emphasis is placed on use of techniques and materials to test for and identify specific bacteria. One hour is considered as the minimum time needed for the activity. The instructional packet includes a list of equipment needed, the type of space required, and a bibliography. A calculation chart, a cleanup procedure sheet, and a student evaluation form are included with the student script. (EB)