DRINKING WATER TREATMENT
OPERATOR CLASS 1 LATEST UPDATE
2026
If a customer complains about the drinking water characteristics, the operator should
record the complaint and... - ANSWERInvestigate immediately
What term is used when a water utility divides its total operating expenses into a total
revenue? - ANSWEROperating ratio
How often should data, such as flow rate, amount of water treated, dosage of chemical,
and reservoir levels be recorded? - ANSWERDaily
Under the requirements of the Safe Water Drinking Act, it is the duty of the water
purveyor to deliver potable water of proper quantity only as far as the... -
ANSWERConsumer's tap inside the home
According to the Safe Drinking Water Act, the basic definition of a public water supply
system is any water system that supplies water for human consumption that serves.... -
ANSWER15 service connections or over 25 persons for over 60 days a year
What agent is responsible for reporting lab results to the regulatory agency? -
ANSWERWater system owner
What causes water to moves through pores in the soil & rocks? - ANSWERGravity
Disease producing bacteria are called ? - ANSWERPathogens
What are the two main causes of hardness in water? - ANSWERCalcium & Magnesium
What device measures the flow rate of gases? - ANSWERRotameter
Excessive internal pressure, which may be several times the normal operating pressure
and can seriously damage hydropneumatic tanks, valves, and piping network? -
ANSWERWater Hammer
Most pumps must be primed before startup in order to... - ANSWERStart the flow of
water
What is the purpose of a check valve? - ANSWERAct as an automatic shutoff valve
when the pump stops
Which form of hypochlorite is the most dangerous to handle? - ANSWERCalcium
, What type of fire extinguisher should be used for fires with live electricity present? -
ANSWERClass C
Documents that provide a profile of hazardous material? - ANSWERMSDS
What is the purpose of a pump guard? - ANSWERProtects operators from rotating parts
A fire hydrant should NOT be installed on a line less than __________ in diameter. -
ANSWER6 inches
Primary purpose of disinfecting drinking water is to? - ANSWERInactivate or kill
pathogens
Amount of water needed for a bacti sample? - ANSWER100ml
Desirable media characteristics include... - ANSWERHard & durable
Two general types of backflow are... - ANSWERbackpressure & backsiphonage
What is the physical connection, direct or indirect, which provides the opportunity for
non-potable water to enter a conduit, pipe or receptacle containing potable water? -
ANSWERCross connection
When bringing community water service to a home with a private well, what is the most
positive method of preventing a cross connection between the two systems? -
ANSWERComplete isolation between the two systems using an air gap
1 ft = - ANSWER12 inches
1 yard = - ANSWER3 ft.
1 cu. ft. = - ANSWER7.48 gal
1 gal= - ANSWER8.34 lbs or 3.785 L
Million gallons per day - ANSWERMGD
Another name for bleach relative to disinfection is... - ANSWERSodium hypochlorite
The main operating unit of a centrifugal pump is... - ANSWERImpeller
The maximum height that a single centrifugal pump can theoretically push water is? -
ANSWER33.9 feet
Why do we monitor nitrates? - ANSWERMethelomoglobinemia ( blue baby syndrome)
OPERATOR CLASS 1 LATEST UPDATE
2026
If a customer complains about the drinking water characteristics, the operator should
record the complaint and... - ANSWERInvestigate immediately
What term is used when a water utility divides its total operating expenses into a total
revenue? - ANSWEROperating ratio
How often should data, such as flow rate, amount of water treated, dosage of chemical,
and reservoir levels be recorded? - ANSWERDaily
Under the requirements of the Safe Water Drinking Act, it is the duty of the water
purveyor to deliver potable water of proper quantity only as far as the... -
ANSWERConsumer's tap inside the home
According to the Safe Drinking Water Act, the basic definition of a public water supply
system is any water system that supplies water for human consumption that serves.... -
ANSWER15 service connections or over 25 persons for over 60 days a year
What agent is responsible for reporting lab results to the regulatory agency? -
ANSWERWater system owner
What causes water to moves through pores in the soil & rocks? - ANSWERGravity
Disease producing bacteria are called ? - ANSWERPathogens
What are the two main causes of hardness in water? - ANSWERCalcium & Magnesium
What device measures the flow rate of gases? - ANSWERRotameter
Excessive internal pressure, which may be several times the normal operating pressure
and can seriously damage hydropneumatic tanks, valves, and piping network? -
ANSWERWater Hammer
Most pumps must be primed before startup in order to... - ANSWERStart the flow of
water
What is the purpose of a check valve? - ANSWERAct as an automatic shutoff valve
when the pump stops
Which form of hypochlorite is the most dangerous to handle? - ANSWERCalcium
, What type of fire extinguisher should be used for fires with live electricity present? -
ANSWERClass C
Documents that provide a profile of hazardous material? - ANSWERMSDS
What is the purpose of a pump guard? - ANSWERProtects operators from rotating parts
A fire hydrant should NOT be installed on a line less than __________ in diameter. -
ANSWER6 inches
Primary purpose of disinfecting drinking water is to? - ANSWERInactivate or kill
pathogens
Amount of water needed for a bacti sample? - ANSWER100ml
Desirable media characteristics include... - ANSWERHard & durable
Two general types of backflow are... - ANSWERbackpressure & backsiphonage
What is the physical connection, direct or indirect, which provides the opportunity for
non-potable water to enter a conduit, pipe or receptacle containing potable water? -
ANSWERCross connection
When bringing community water service to a home with a private well, what is the most
positive method of preventing a cross connection between the two systems? -
ANSWERComplete isolation between the two systems using an air gap
1 ft = - ANSWER12 inches
1 yard = - ANSWER3 ft.
1 cu. ft. = - ANSWER7.48 gal
1 gal= - ANSWER8.34 lbs or 3.785 L
Million gallons per day - ANSWERMGD
Another name for bleach relative to disinfection is... - ANSWERSodium hypochlorite
The main operating unit of a centrifugal pump is... - ANSWERImpeller
The maximum height that a single centrifugal pump can theoretically push water is? -
ANSWER33.9 feet
Why do we monitor nitrates? - ANSWERMethelomoglobinemia ( blue baby syndrome)
