Before going through the Study Guides, IDEM recommends you first start with the materials on the Wastewater Operator Certification Exam Book List.
In an effort to streamline the certification exam process IDEM has combined all necessary formulas to one Formula Sheet [PDF]. It will be provided for your use during the exam. Any of these formulas may be used on any classification of exam. Mathematics will still represent approximately ten percent of each exam. You will have to choose the appropriate formula and utilize it to calculate the correct answer for each math question.