One of twelve water treatment technology units, this student manual on chemistry/bacteriology provides instructional materials for twelve competencies. (The twelve units are designed for a continuing education training course for public water supply operators.) The competencies focus on the following areas: waterborne diseases, water sampling procedures, manganese test and remedies, iron test and remedies, hardness test and remedies, pH testing methods, coagulation processes, jar test, corrosion control by pH adjustment, alkalinity test, dry chemical feeders, and chemical solution feeders. For each competency, student objectives, resources (information sheets), learning activities, and evaluation activities are provided. The appendices contain information sheets on bacteriological sampling and examination, softening hard water, coagulation, corrosion and control, and laboratory equipment. Generally, an evaluation form with answer key is provided for each student competency. (JH)