Below is a list of free test prep training resources to supplement our previous articles: Free Test Prep Training Resources for Operators , Operator Math Part 3: Continuous Education , and Featured Video: Water Exam Success . These resources can help prospective water and wastewater operators prepare for certification exams. Operator Licensing Requirements Across the United States The 125-page report outlines licensing requirements for water and wastewater operators across all 50 states to determine opportunities for and barriers to cross-training. Drinking Water C & D Level Certification Review This 434-page document contains a collection of 22 presentations that will help operators prepare for their C & D level certification exams. Topics discussed include: how to improve your exam score; filtration; water treatment; the Safe Drinking Water Act; Florida drinking water rules; water sources; well requirements for PWSs; storage systems; chlorination and disinfection; disinfection and disinfection byproducts; water treatment plant maintenance; taste, odor, aeration, iron removal, and stabilization; sedimentation; demineralization; coagulation & flocculation; corrosion control; water softening; water transmission & distribution; basic chemistry; laboratory methods; math; and treatment plant safety. Need-to-Know Criteria Wastewater Treatment Operator Class I This 11-page factsheet was developed to assist operators in understanding the content that will be covered in (a previous version of) ABC’s Standardized Wastewater Treatment Operator Class I exam. A methodical and comprehensive international investigation was conducted to determine the most significant job tasks performed by wastewater treatment operators. The content covered on the exam represents the job tasks identified through this research as essential operator competencies and is not limited to the practices of your system/facility. Regulatory Resources Handbook for Water Distribution System Operators This 39-page handbook contains useful information on approved training courses, related regulations, and associations that assist in training or technical programs. Drinking Water Training System This U.S EPA website provides training on the federal requirements of the National Primary Drinking Water Regulations. Chemistry Resources ABC Formula/Conversion Table for Water Treatment, Distribution and Laboratory Exams This 4-page document can be used as a study tool to help water operators prepare for certification exams. ABC Formula/Conversion Table for Wastewater Treatment, Industrial, Collection and Laboratory Exams This 5-page document lists formula, conversion factors, and abbreviations needed to prepare for the Wastewater Treatment, Industrial, Collection and Laboratory Exams. Water Treatment and Distribution Operator Chemistry Reference Sheet This 3-page factsheet includes frequently used formulas and conversions for water treatment and distribution operators. Math Resources Absolution Water - Conversions This 12-minute video offers a tutorial on math conversions noting special tips for finding the correct answer without any mistakes. Water Treatment and Distribution Operator Math Reference Sheet: Frequently used formulas and conversions This 15-page factsheet contains frequently used formulas and conversions for water treatment and distribution operators.