WATER OPERATOR CLASS 3
QUESTIONS AND ANSWERS 2026
- 2027
5 ft or deeper - ANSWERS-Excavations ____ or deeper require
shoring.
2 ft from the bank and on one side - ANSWERS-Spoil dirt should be
kept how far from the bank and where?
3/4' x 1' - ANSWERS-The ratio to slope an excavation site is:
4 ft - ANSWERS-Excavations deeper than ____ require a ladder.
3 ft - ANSWERS-Ladders must extend ____ above excavation.
25 ft - ANSWERS-A ladder must be within ____ of workers at all
time.
Iron and Manganese removal - ANSWERS-Potassium Permanganate
is used for what?
,Phosphates - added before chlorine - ANSWERS-Used for iron and
manganese sequestration or corrosion control and added ____
chlorine.
Activated Carbon - ANSWERS-Used for removal of fast and odor.
ADSORPTION
Lowers it. Acid - ANSWERS-Sulfuric acid does what to the pH?
Raises it (base) - ANSWERS-Caustic soda does what to the pH and
alkalinity?
Raises it (base) - ANSWERS-Soda ash does what to the pH?
Lime, alum, Ferric Chloride, Ferric Sulfate, and cationic polymers -
ANSWERS-Primary coagulants include:
Slippery - ANSWERS-Greatest danger when using polymers:
Lowers it greatly - ANSWERS-Alum does what to the pH?
Ammonia - ANSWERS-Makes chloramins
Bluestone- used to control algae - ANSWERS-What is another name
for copper sulfate and what is its use?
, 1.2 - ANSWERS-Standard pH for Hydrofluosilicic acid is:
Chloramines - ANSWERS-Chlorine plus ammonia creates what
disinfectant?
No residual - ANSWERS-What is a disadvantage of UV disinfection.
Phenol Red - ANSWERS-The reagent used to determine pH with a
colorimeter is:
V/V Test/ 5-20% - ANSWERS-Test for % of slurry. What % is
normal?
Non-ionic Polymers - ANSWERS-Polymers sometimes added to filter
to reduce turbidity.
2% - ANSWERS-Backwashing should use no more than what
percentage or finished water?
50% - ANSWERS-Filter bed expansion should be what percentage
when backwashing?
On top/smallest particles - ANSWERS-Where does Anthracite go in
filter bed. Do smallest or largest particles go on top?
QUESTIONS AND ANSWERS 2026
- 2027
5 ft or deeper - ANSWERS-Excavations ____ or deeper require
shoring.
2 ft from the bank and on one side - ANSWERS-Spoil dirt should be
kept how far from the bank and where?
3/4' x 1' - ANSWERS-The ratio to slope an excavation site is:
4 ft - ANSWERS-Excavations deeper than ____ require a ladder.
3 ft - ANSWERS-Ladders must extend ____ above excavation.
25 ft - ANSWERS-A ladder must be within ____ of workers at all
time.
Iron and Manganese removal - ANSWERS-Potassium Permanganate
is used for what?
,Phosphates - added before chlorine - ANSWERS-Used for iron and
manganese sequestration or corrosion control and added ____
chlorine.
Activated Carbon - ANSWERS-Used for removal of fast and odor.
ADSORPTION
Lowers it. Acid - ANSWERS-Sulfuric acid does what to the pH?
Raises it (base) - ANSWERS-Caustic soda does what to the pH and
alkalinity?
Raises it (base) - ANSWERS-Soda ash does what to the pH?
Lime, alum, Ferric Chloride, Ferric Sulfate, and cationic polymers -
ANSWERS-Primary coagulants include:
Slippery - ANSWERS-Greatest danger when using polymers:
Lowers it greatly - ANSWERS-Alum does what to the pH?
Ammonia - ANSWERS-Makes chloramins
Bluestone- used to control algae - ANSWERS-What is another name
for copper sulfate and what is its use?
, 1.2 - ANSWERS-Standard pH for Hydrofluosilicic acid is:
Chloramines - ANSWERS-Chlorine plus ammonia creates what
disinfectant?
No residual - ANSWERS-What is a disadvantage of UV disinfection.
Phenol Red - ANSWERS-The reagent used to determine pH with a
colorimeter is:
V/V Test/ 5-20% - ANSWERS-Test for % of slurry. What % is
normal?
Non-ionic Polymers - ANSWERS-Polymers sometimes added to filter
to reduce turbidity.
2% - ANSWERS-Backwashing should use no more than what
percentage or finished water?
50% - ANSWERS-Filter bed expansion should be what percentage
when backwashing?
On top/smallest particles - ANSWERS-Where does Anthracite go in
filter bed. Do smallest or largest particles go on top?
