Operate or control an entire process or system of machines, often through the use of control boards, to transfer or treat water or liquid waste.

Add chemicals, such as ammonia, chlorine, and lime, to disinfect and deodorize water and other liquids. Operate and adjust controls on equipment to purify and clarify water, process or dispose of sewage, and generate power. Inspect equipment and monitor operating conditions, meters, and gauges to determine load requirements and detect malfunctions. Collect and test water and sewage samples, using test equipment and color analysis standards. Record operational data, personnel attendance, and meter and gauge readings on specified forms. Maintain, repair, and lubricate equipment, using hand tools and power tools. Clean and maintain tanks and filter beds, using hand tools and power tools. Direct and coordinate plant workers engaged in routine operations and maintenance activities.

Biology -- Knowledge of plant and animal organisms, their tissues, cells, functions, interdependencies, and interactions with each other and the environment. Chemistry -- Knowledge of the chemical composition, structure, and properties of substances and of the chemical processes and transformations that they undergo. This includes uses of chemicals and their interactions, danger signs, production techniques, and disposal methods. Public Safety and Security -- Knowledge of relevant equipment, policies, procedures, and strategies to promote effective local, state, or national security operations for the protection of people, data, property, and institutions. Mathematics -- Knowledge of arithmetic, algebra, geometry, calculus, statistics, and their applications. English Language -- Knowledge of the structure and content of the English language including the meaning and spelling of words, rules of composition, and grammar. Mechanical -- Knowledge of machines and tools, including their designs, uses, repair, and maintenance.

Reading Comprehension -- Understanding written sentences and paragraphs in work related documents. Operation and Control -- Controlling operations of equipment or systems. Troubleshooting -- Determining causes of operating errors and deciding what to do about it. Active Listening -- Giving full attention to what other people are saying, taking time to understand the points being made, asking questions as appropriate, and not interrupting at inappropriate times. Monitoring -- Monitoring/Assessing performance of yourself, other individuals, or organizations to make improvements or take corrective action. Operation Monitoring -- Watching gauges, dials, or other indicators to make sure a machine is working properly. Equipment Maintenance -- Performing routine maintenance on equipment and determining when and what kind of maintenance is needed. Learning Strategies -- Selecting and using training/instructional methods and procedures appropriate for the situation when learning or teaching new things. Critical Thinking -- Using logic and reasoning to identify the strengths and weaknesses of alternative solutions, conclusions or approaches to problems. Writing -- Communicating effectively in writing as appropriate for the needs of the audience.

Near Vision -- The ability to see details at close range (within a few feet of the observer). Problem Sensitivity -- The ability to tell when something is wrong or is likely to go wrong. It does not involve solving the problem, only recognizing there is a problem. Control Precision -- The ability to quickly and repeatedly adjust the controls of a machine or a vehicle to exact positions. Deductive Reasoning -- The ability to apply general rules to specific problems to produce answers that make sense. Multilimb Coordination -- The ability to coordinate two or more limbs (for example, two arms, two legs, or one leg and one arm) while sitting, standing, or lying down. It does not involve performing the activities while the whole body is in motion. Arm-Hand Steadiness -- The ability to keep your hand and arm steady while moving your arm or while holding your arm and hand in one position. Information Ordering -- The ability to arrange things or actions in a certain order or pattern according to a specific rule or set of rules (e.g., patterns of numbers, letters, words, pictures, mathematical operations). Oral Comprehension -- The ability to listen to and understand information and ideas presented through spoken words and sentences. Inductive Reasoning -- The ability to combine pieces of information to form general rules or conclusions (includes finding a relationship among seemingly unrelated events). Oral Expression -- The ability to communicate information and ideas in speaking so others will understand.

Monitor Processes, Materials, or Surroundings -- Monitoring and reviewing information from materials, events, or the environment, to detect or assess problems. Performing General Physical Activities -- Performing physical activities that require considerable use of your arms and legs and moving your whole body, such as climbing, lifting, balancing, walking, stooping, and handling of materials. Inspecting Equipment, Structures, or Material -- Inspecting equipment, structures, or materials to identify the cause of errors or other problems or defects. Evaluating Information to Determine Compliance with Standards -- Using relevant information and individual judgment to determine whether events or processes comply with laws, regulations, or standards. Handling and Moving Objects -- Using hands and arms in handling, installing, positioning, and moving materials, and manipulating things. Updating and Using Relevant Knowledge -- Keeping up-to-date technically and applying new knowledge to your job. Making Decisions and Solving Problems -- Analyzing information and evaluating results to choose the best solution and solve problems. Identifying Objects, Actions, and Events -- Identifying information by categorizing, estimating, recognizing differences or similarities, and detecting changes in circumstances or events. Documenting/Recording Information -- Entering, transcribing, recording, storing, or maintaining information in written or electronic/magnetic form. Getting Information -- Observing, receiving, and otherwise obtaining information from all relevant sources.