WASTEWATER OPERATOR CLASS C
CERTIFICATION EVALUATION EXAMS 2026
FULL QUESTIONS AND SOLUTIONS
◉ What is a wastewater operator supposed to do? Answer: Protect the
downstream users
◉ Characteristics of wastewater. Answer: Grayish appearance
Musty odor
6.8-7.2 pH
200-250mg/l BOD5
200-250 mg/l TSS
◉ Disinfection. Answer: The process of killing pathogenic (disease
causing) organisms
◉ Sterilization. Answer: The process of killing all organisms in a water
sample
, ◉ National Pollutant Discharge Elimination System (NPDES). Answer:
Federal or state agency responsible for control of pollutant discharges
◉ Inflow & Inflitration. Answer: Water that enters into the collection
and treatment system from sources other that service connections
◉ Area of a circle. Answer: 3.14xrxr
◉ Volume of a cylinder. Answer: 3.14 x r x r x h or d
◉ Weight of a gallon. Answer: 8.34lbs
◉ Gallons in 1 cubic foot. Answer: 7.48 gallons
◉ 1%. Answer: 10,000 PPM (Parts per million)
◉ Circumference of a circle. Answer: 2(3.14)r or 3.14d
◉ Area of a trapezoid. Answer: (B1+B2)/2 x A
◉ Area of a circle. Answer: (3.14)(r)(r)
CERTIFICATION EVALUATION EXAMS 2026
FULL QUESTIONS AND SOLUTIONS
◉ What is a wastewater operator supposed to do? Answer: Protect the
downstream users
◉ Characteristics of wastewater. Answer: Grayish appearance
Musty odor
6.8-7.2 pH
200-250mg/l BOD5
200-250 mg/l TSS
◉ Disinfection. Answer: The process of killing pathogenic (disease
causing) organisms
◉ Sterilization. Answer: The process of killing all organisms in a water
sample
, ◉ National Pollutant Discharge Elimination System (NPDES). Answer:
Federal or state agency responsible for control of pollutant discharges
◉ Inflow & Inflitration. Answer: Water that enters into the collection
and treatment system from sources other that service connections
◉ Area of a circle. Answer: 3.14xrxr
◉ Volume of a cylinder. Answer: 3.14 x r x r x h or d
◉ Weight of a gallon. Answer: 8.34lbs
◉ Gallons in 1 cubic foot. Answer: 7.48 gallons
◉ 1%. Answer: 10,000 PPM (Parts per million)
◉ Circumference of a circle. Answer: 2(3.14)r or 3.14d
◉ Area of a trapezoid. Answer: (B1+B2)/2 x A
◉ Area of a circle. Answer: (3.14)(r)(r)
