The tests that the operator must pass, are dependent upon the class and subclass of the plant at which she or he will work. These pages are designed to answer questions about the program, provide regional contacts and exam dates for certified operators. Wis. Adm. Code, and has been issued a certificate by the DNR to operate one or more of the classifications of waterworks or wastewater treatment plants. To become a certified wastewater operator for subclasses A through J you must pass an introductory or advanced general written exam and introductory or advanced subclass written exam. Study guides are available for each subclass exam to help you study for the exams.
Registration is required before taking a written exam.
The application must be postmarked at least 28 days prior to the scheduled exam date. Any exam that you pass will be credited to your record. You will receive notice of your exam scores by mail approximately 3-4 weeks after the exam date. The letter sent out after each exam to notify you of the score you received includes a list of missed objectives on the right hand side of the letter. Look up the missed objectives in your study guide for the appropriate subclass to determine what areas of the test you got wrong.