This updated studybook is intended to help wastewater collection system operators expand their knowledge and prepare for certification examinations. Practice with sample examination questions has been proven to be extremely beneficial in preparing for these tests. The questions presented here cover the following broad categories: background knowledge, support systems, operation and maintenance, supervision and management, safety procedures, design and construction, electrical pumps and motors, and mathematics. Developing strong mathematical skills will significantly help an operator pass certification examinations, resulting in more efficient and effective operators.