New Jersey Water Treatment
Operator EXAM STUDY GUIDE 2026/2027
ACCURATE QUESTIONS WITH CORRECT
DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. If a customer complains about the drinking water characteristics, the
operator should record the complaint and... - ANSWER ✔ Investigate
immediately
2. What term is used when a water utility divides its total operating expenses
into a total revenue? - ANSWER ✔ Operating ratio
3. How often should data, such as flow rate, amount of water treated, dosage of
chemical, and reservoir levels be recorded? - ANSWER ✔ Daily
4. 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... - ANSWER ✔ Consumer's tap inside the home
5. 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.... - ANSWER ✔ 15 service connections or over
25 persons for over 60 days a year
6. What agent is responsible for reporting lab results to the regulatory agency?
- ANSWER ✔ Water system owner
,7. What causes water to moves through pores in the soil & rocks? - ANSWER
✔ Gravity
8. Disease producing bacteria are called ? - ANSWER ✔ Pathogens
9. What are the two main causes of hardness in water? - ANSWER ✔
Calcium & Magnesium
10.What device measures the flow rate of gases? - ANSWER ✔ Rotameter
11.Excessive internal pressure, which may be several times the normal
operating pressure and can seriously damage hydropneumatic tanks, valves,
and piping network? - ANSWER ✔ Water Hammer
12.Most pumps must be primed before startup in order to... - ANSWER ✔
Start the flow of water
13.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? - ANSWER ✔ Cross connection
14.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? - ANSWER ✔ Complete isolation between the two systems
using an air gap
15.1 ft = - ANSWER ✔ 12 inches
16.1 yard = - ANSWER ✔ 3 ft.
17.1 cu. ft. = - ANSWER ✔ 7.48 gal
18.1 gal= - ANSWER ✔ 8.34 lbs or 3.785 L
19.Million gallons per day - ANSWER ✔ MGD
20.Another name for bleach relative to disinfection is... - ANSWER ✔
Sodium hypochlorite
,21.Operators are urged to develop close working relationships with their local
regulatory agencies to keep themselves informed of frequent changes in
regulations and requirements. - ANSWER ✔ True
22.The safe drinking water act gives a EPA The power to require public water
systems to monitor and report their levels of identified contaminants -
ANSWER ✔ True
23.Projected regulation of the flow to water treatment plants depend on the
method used to deliver water to the plant - ANSWER ✔ False
24.Chlorine is a strong respiratory irritant, and either prolonged exposure to
chlorine gas or high concentrations of chlorine gas could be fatal -
ANSWER ✔ True
25.Relay logic is a method of switching electrical power on and off in
accordance with a predetermined sequence by means of relays, process
switches and contacts, timers, and manual switches - ANSWER ✔ True
26.Automation relieves operators of the responsibility to make operational
decisions and to exercise operational control - ANSWER ✔ False
27.Where are the sampling points located for required sampling of turbidity in a
community water system? - ANSWER ✔ Points where water enters the
distribution system, including all filter effluents if a surface water treatment
plant
28.What is the MCL for haloacetic acids (HAA5)? - ANSWER ✔ 0.060 mg/L
29.What should be done with the lid while collecting a bacteriological sample?
- ANSWER ✔ Hold the cap, threads down, while collecting the sample
with the other hand
30.Coliform bacteria will produce gas in ________ broth at _______ within
______.
A. Lactose or brilliant bile tryptose, 35 C, 24 to 48 hours
, B. Lactose or brilliant bile tryptose, 35 C, 48 to 72 hours
C. Lactose or lauryl tryptose, 35.5 c, 24 to 48 hours
D. lactose or lauryl tryptose, 35.5 c, 18 to 24 hours - ANSWER ✔ C.
Lactose or lauryl tryptose, 35.5 C, 24 to 48 hours
31.The saturation point of a chemical in water varies with.....
A. pH
B. Total dissolved solids
C. Temperature
D. All of the above - ANSWER ✔ D. All of the above
32.The amount of oxygen that can remain dissolved in water is a function of the
water's_______,and the_______ the water, the _______ the possible
concentration of dissolved oxygen.
A. pH, colder, lower
B. pH, higher, higher
C. Temperature, colder, higher
D. Temperature, higher, higher - ANSWER ✔ C. Temperature, colder,
higher
33.What is usually used to disinfect the gravel packing of a groundwater well? -
ANSWER ✔ Powder of calcium hypochlorite tablet
34.__________________ is a pretreatment process used to remove gravel, sand,
and silt from the raw water before it enters the main treatment facility.
A. Screening
B. Preoxidation
C. Presedimentation
D. Microstraining - ANSWER ✔ C. Presedimentation
35.Presedimentation basins can be converted with a retrofit of ________ and
this can help ___________.
A. Tube settlers, eliminate water fowl problem
B. Baffles, reduce aquatic plants
C. Lamella plates, control the growth of algae
Operator EXAM STUDY GUIDE 2026/2027
ACCURATE QUESTIONS WITH CORRECT
DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. If a customer complains about the drinking water characteristics, the
operator should record the complaint and... - ANSWER ✔ Investigate
immediately
2. What term is used when a water utility divides its total operating expenses
into a total revenue? - ANSWER ✔ Operating ratio
3. How often should data, such as flow rate, amount of water treated, dosage of
chemical, and reservoir levels be recorded? - ANSWER ✔ Daily
4. 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... - ANSWER ✔ Consumer's tap inside the home
5. 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.... - ANSWER ✔ 15 service connections or over
25 persons for over 60 days a year
6. What agent is responsible for reporting lab results to the regulatory agency?
- ANSWER ✔ Water system owner
,7. What causes water to moves through pores in the soil & rocks? - ANSWER
✔ Gravity
8. Disease producing bacteria are called ? - ANSWER ✔ Pathogens
9. What are the two main causes of hardness in water? - ANSWER ✔
Calcium & Magnesium
10.What device measures the flow rate of gases? - ANSWER ✔ Rotameter
11.Excessive internal pressure, which may be several times the normal
operating pressure and can seriously damage hydropneumatic tanks, valves,
and piping network? - ANSWER ✔ Water Hammer
12.Most pumps must be primed before startup in order to... - ANSWER ✔
Start the flow of water
13.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? - ANSWER ✔ Cross connection
14.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? - ANSWER ✔ Complete isolation between the two systems
using an air gap
15.1 ft = - ANSWER ✔ 12 inches
16.1 yard = - ANSWER ✔ 3 ft.
17.1 cu. ft. = - ANSWER ✔ 7.48 gal
18.1 gal= - ANSWER ✔ 8.34 lbs or 3.785 L
19.Million gallons per day - ANSWER ✔ MGD
20.Another name for bleach relative to disinfection is... - ANSWER ✔
Sodium hypochlorite
,21.Operators are urged to develop close working relationships with their local
regulatory agencies to keep themselves informed of frequent changes in
regulations and requirements. - ANSWER ✔ True
22.The safe drinking water act gives a EPA The power to require public water
systems to monitor and report their levels of identified contaminants -
ANSWER ✔ True
23.Projected regulation of the flow to water treatment plants depend on the
method used to deliver water to the plant - ANSWER ✔ False
24.Chlorine is a strong respiratory irritant, and either prolonged exposure to
chlorine gas or high concentrations of chlorine gas could be fatal -
ANSWER ✔ True
25.Relay logic is a method of switching electrical power on and off in
accordance with a predetermined sequence by means of relays, process
switches and contacts, timers, and manual switches - ANSWER ✔ True
26.Automation relieves operators of the responsibility to make operational
decisions and to exercise operational control - ANSWER ✔ False
27.Where are the sampling points located for required sampling of turbidity in a
community water system? - ANSWER ✔ Points where water enters the
distribution system, including all filter effluents if a surface water treatment
plant
28.What is the MCL for haloacetic acids (HAA5)? - ANSWER ✔ 0.060 mg/L
29.What should be done with the lid while collecting a bacteriological sample?
- ANSWER ✔ Hold the cap, threads down, while collecting the sample
with the other hand
30.Coliform bacteria will produce gas in ________ broth at _______ within
______.
A. Lactose or brilliant bile tryptose, 35 C, 24 to 48 hours
, B. Lactose or brilliant bile tryptose, 35 C, 48 to 72 hours
C. Lactose or lauryl tryptose, 35.5 c, 24 to 48 hours
D. lactose or lauryl tryptose, 35.5 c, 18 to 24 hours - ANSWER ✔ C.
Lactose or lauryl tryptose, 35.5 C, 24 to 48 hours
31.The saturation point of a chemical in water varies with.....
A. pH
B. Total dissolved solids
C. Temperature
D. All of the above - ANSWER ✔ D. All of the above
32.The amount of oxygen that can remain dissolved in water is a function of the
water's_______,and the_______ the water, the _______ the possible
concentration of dissolved oxygen.
A. pH, colder, lower
B. pH, higher, higher
C. Temperature, colder, higher
D. Temperature, higher, higher - ANSWER ✔ C. Temperature, colder,
higher
33.What is usually used to disinfect the gravel packing of a groundwater well? -
ANSWER ✔ Powder of calcium hypochlorite tablet
34.__________________ is a pretreatment process used to remove gravel, sand,
and silt from the raw water before it enters the main treatment facility.
A. Screening
B. Preoxidation
C. Presedimentation
D. Microstraining - ANSWER ✔ C. Presedimentation
35.Presedimentation basins can be converted with a retrofit of ________ and
this can help ___________.
A. Tube settlers, eliminate water fowl problem
B. Baffles, reduce aquatic plants
C. Lamella plates, control the growth of algae
