determines process control settings; changes 1-ton chlorine containers; operates and monitors filter control systems; performs process control tests to determine proper dosage; recognizes and corrects changes in system operating parameters; starts up and shuts down treatment process units; troubleshoots and makes adjustments to correct potential process problems; backwashes gravity filters; checks water or wastewater treatment process functions during shift; monitors and controls ozone generation system; understands water or wastewater treatment principles. Work Environment: Work is performed outdoors with exposure to noise, dirt, grease, dust, pollen, odors, wetness, fumes, animals, insects, chemicals, treated/untreated sewer, treated/untreated water, inclement weather, and machinery with moving parts requiring use of protective devices.