Outlined are practices and procedures that should be followed in order to protect and fully realize the benefits of sewer systems and also to maximize service and minimize inconveniences to the public. Written in practical terms, the manual is designed to be of immediate use to municipal employees and others involved in sewer maintenance operations. Topics covered are (1) operation and maintenance, (2) industrial waste problems, (3) safety, (4) preventive maintenance, and (5) sewer by-laws. (WB)