WATER TREATMENT PRACTICE EXAM
QUESTIONS AND DETAILED SOLUTIONS
2026
▶ a water well is an... Answer: excavation or structure created in the
ground by digging, driving, boring, or drilling to access groundwater in
underground aquifers.
▶ one of the most used pumps that uses an impeller to spin the liquid
outward is know as a.... Answer: cintrufugal pump
▶ this type of pump uses an impeller-diffuser to push water using a Venturi
throat to get velocity... Answer: Jet Pump
▶ Reciprocating Pump Answer: uses a piston or diaphragm to move liquid
and is also used for injecting chemicals into our water.
▶ Rotary Pumps Answer: uses a rotating mechanism to move liquid also
used for injecting chemicals into our water.
▶ The Impeller Answer: The impeller is the heart of the pump that spins
liquid outward by centrifugal force.
▶ The "shaft" of a pump... Answer: supports the impeller, is covered by a
sleeve, and can be made of several different metals depending on the
liquid being pumped.
▶ The Pump Casing Answer: The impeller sets inside the pump casing.
The shaft goes through it. There should be no strain whatsoever on the
casing.
▶ Nutrients promote Eutrophication of a lake from... Answer: Phosphates,
Nitrates, organic nitrogen compounds and cause the growth of algal
blooms.
, ▶ Algal Blooms cause... Answer: Taste and odor problems, very short filter
runs, An increase in pH, depletion of dissolved oxygen, and organic
loading.
▶ TON Answer: Threshold odor number
▶ pH fluctuations Answer: Daytime pH goes up and Nighttime pH goes
down.
▶ Costs go up to maintain consistent pH because... Answer: We need to
add more chlorine & coagulants, or more soda ash or caustic to lower the
pH.
▶ Dissolved Oxygen Depletion Answer: bacteria feed/metabolize on dead
algal cells that causes oxygen to be used up, which in return causes sever
fish die offs.
▶ Increase in color & chlorination is known as... Answer: Organic Loading
▶ Trihalomethanes, Haloacetic Acids (HAA5s), Bromate, and Chlorite are
known as... Answer: disinfect byproducts that cause cancer
▶ MCL : TTHMs Answer: .08 ppm
▶ MCL: HAA5s Answer: .06 ppm
▶ MCL: Bromate Answer: .01 ppm
▶ MCL: Chlorite Answer: 1 ppm
▶ MRDLs Answer: Maximum Residual Detection Levels
▶ MRDL: Chlorine Answer: 4 ppm
▶ MRDL: Chloramines Answer: 4 ppm
▶ MRDL: Chlorine Dioxide Answer: .8 ppm
QUESTIONS AND DETAILED SOLUTIONS
2026
▶ a water well is an... Answer: excavation or structure created in the
ground by digging, driving, boring, or drilling to access groundwater in
underground aquifers.
▶ one of the most used pumps that uses an impeller to spin the liquid
outward is know as a.... Answer: cintrufugal pump
▶ this type of pump uses an impeller-diffuser to push water using a Venturi
throat to get velocity... Answer: Jet Pump
▶ Reciprocating Pump Answer: uses a piston or diaphragm to move liquid
and is also used for injecting chemicals into our water.
▶ Rotary Pumps Answer: uses a rotating mechanism to move liquid also
used for injecting chemicals into our water.
▶ The Impeller Answer: The impeller is the heart of the pump that spins
liquid outward by centrifugal force.
▶ The "shaft" of a pump... Answer: supports the impeller, is covered by a
sleeve, and can be made of several different metals depending on the
liquid being pumped.
▶ The Pump Casing Answer: The impeller sets inside the pump casing.
The shaft goes through it. There should be no strain whatsoever on the
casing.
▶ Nutrients promote Eutrophication of a lake from... Answer: Phosphates,
Nitrates, organic nitrogen compounds and cause the growth of algal
blooms.
, ▶ Algal Blooms cause... Answer: Taste and odor problems, very short filter
runs, An increase in pH, depletion of dissolved oxygen, and organic
loading.
▶ TON Answer: Threshold odor number
▶ pH fluctuations Answer: Daytime pH goes up and Nighttime pH goes
down.
▶ Costs go up to maintain consistent pH because... Answer: We need to
add more chlorine & coagulants, or more soda ash or caustic to lower the
pH.
▶ Dissolved Oxygen Depletion Answer: bacteria feed/metabolize on dead
algal cells that causes oxygen to be used up, which in return causes sever
fish die offs.
▶ Increase in color & chlorination is known as... Answer: Organic Loading
▶ Trihalomethanes, Haloacetic Acids (HAA5s), Bromate, and Chlorite are
known as... Answer: disinfect byproducts that cause cancer
▶ MCL : TTHMs Answer: .08 ppm
▶ MCL: HAA5s Answer: .06 ppm
▶ MCL: Bromate Answer: .01 ppm
▶ MCL: Chlorite Answer: 1 ppm
▶ MRDLs Answer: Maximum Residual Detection Levels
▶ MRDL: Chlorine Answer: 4 ppm
▶ MRDL: Chloramines Answer: 4 ppm
▶ MRDL: Chlorine Dioxide Answer: .8 ppm
