Water Treatment Operator Certification Study Guide (AWWA) Exam 2026/2027 Questions with Complete Solutions

Water Treatment Operator Certification Study Guide (AWWA) Exam 2026/2027 Questions with Complete Solutions A continuously flowing watercourse - answer-Perennial Stream Algae cause PH to ....... at night - answer-Decrease What contributes to creation of algae blooms - answer-Increased nutrients Iron is found mostly in what sources of water - answer-Groundwater Also called the rule of reasonable sharing - answer-Riparian Doctrine Water high in salinity and warm is - answer-Low in dissolved oxygen Reservoir turnover - answer-Denser water at surface sinking toward the bottom Water that flows into rivers after rainfall - answer-Surface runoff Recreation can ....... of land adjacent to a reservoir - answer-increase the threat of erosionWater bearing geological zone composed of material deposited by flowing rivers - answerAlluvial aquifer What effect will algae have on dissolved oxygen - answer-Increase DO during the day and lower DO during the night How does alkalinity effect the use of copper sulfate - answer-Copper sulfate is more effective as alkalinity decreases The amount of water in a formation depends on..... - answer-The porosity of the water-bearing formation What enables blue green algae to grow - answer-Nutrients Recommended loading rate of copper sulfate for algae control - answer-5.4 lbs per acre of surface area Primary origin of coliform bacteria - answer-Animal or human feces Amount of water a well produces for each foot of drawdown - answer-Specific capacity Most common well used in public water supply - answer-Drilled well What is disinfection - answer-inactivation or killing of pathogenic organisms free chlorine residual valus are based on a contact time of.... - answer-10 minutesStrength of Calcium Hypochlorite - answer-65-70% What chemicals raise PH in water - answer-Soda Ash, Caustic Soda, As water temp increases, disinfection action....... - answer-Increases Maximum chlorine usage per day from a 150lb cylinder - answer-42 lbs What chemical is used to soften water through chemical precipitation - answer-Calcium hydroxide (lime) Mudballs are clumps of........ - answer-Filter media and other material Coagulation occurs during the first ..... - answer-1 to 5 seconds When should a filter be backwashed - answer-High head, turbidity breakthrough, or designated hours What does CaCO3 (Calcium Carbonate) do? - answer-Decreases corrosion Most important test to indicate proper sedimentation - answer-turbidity What is considered and excellent zeta potential - answer--1 to -4 What is used to test for residual chlorine - answer-DPD What is a major part of a turbidimeter - answer-Light sourceWhat parameter is used o indicate clarity of water - answer-turbidity PH is the measure of......... - answer-hydrogen ion concentration Free chlorine residual includes - answer-OCI- and HOCI