2025 TEXAS CLASS D WATER LICENSE
|QUESTIONS WITH 100% ANSWERS|GRADED A+
1. What removes tastes, odors, and certain organics and gases, and oxidizes iron
and manganese? This process includes the incorporation of air into the water by
means of spray nozzles , steps or cascades, or trays of diffusers? - ANSWER:
Aeration
2. TCEQ regulation states that Shore installations , marinas, boats and houses on
the watershed must have sewage? - ANSWER: disposal
3. Water aerated or chlorinated at proper pH levels oxidizes the iron and
manganese, turning them into solid? - ANSWER: particles
4. Well casing and cementing protect the well from collapse and surface ? -
ANSWER: contamination
5. Sequestering does not remove iron from the water, but prevents it from
combining with oxygen and? - ANSWER: reddening
6. The quantity of water a formation yields depends on the formations thickness
and? - ANSWER: permeability
7. Cascade aerators, packed air-stripping towers, and air diffusers are used to
aerate? - ANSWER: water
8. Aeration can be used to remove what from the water supply? - ANSWER: iron
and manganese
9. Hydrogen sulfide has a rotten egg odor and is oxidized by? - ANSWER: super-
chlorination
10. When Iron levels get this high, it can cause red stains on clothing, colored water,
or turbidity? - ANSWER: 0.3 mg/L
11. Excess Manganese can cause? - ANSWER: black stains
12. Another method of iron control is the use of? - ANSWER: sequestering agents
13. What is a sequestering agent? - ANSWER: polyphosphates
14. Well water is sometimes? - ANSWER: corrosive
#$%^&*
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, 2025 TEXAS CLASS D WATER LICENSE
|QUESTIONS WITH 100% ANSWERS|GRADED A+
15. Low ph, dissolved gases, high temperatures, and high mineral levels can cause
well water to be? - ANSWER: corrosive
16. What is the process of removing calcium and magnesium by adding lime or by
exchanging ions? - ANSWER: softening
17. An ion exchange replaces calcium ions with? - ANSWER: sodium ions
18. A process available for removing arsenic, fluoride, lead, mercury, nitrate, and
silver from raw water is? - ANSWER: coagulation followed by sedimentation
and filtration
19. A process that forces water through a membrane is? - ANSWER: reverse
osmosis
20. In reverse osmosis a sheet of synthetic material (membrane) under pressure
prevents passage of dissolved materials and larger particles and ejects them in
a? - ANSWER: waste stream
21. The Surface Water Treatment Rule (SWTR) requires community and non-
community wells, springs, and infiltration galleries ( a subsurface tunnel that
collects groundwater) to determine possible direct influence of? - ANSWER:
surface water
22. Changes in groundwater quality can indicate influence of surface water
organisms such as giardia cysts, algae or other? - ANSWER: microorganisms
23. If well is deeper than 50 feet and more than 200 feet from a nearby surface water
body, extensive evaluation of the influence of surface water on a water supply is?
- ANSWER: not required
24. Surface water evaluations are needed on a water supply when shifts in water
quality occur such as turbidity, temperature, pH, and the presence of? -
ANSWER: surface water organisms
25. What are underground, water-bearing formations yielding useful quantities of
water? - ANSWER: Aquifers
26. Problems caused by what are declining water levels and subsidence (sinking of
land)? - ANSWER: over pumping
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)(*&^%$
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|QUESTIONS WITH 100% ANSWERS|GRADED A+
1. What removes tastes, odors, and certain organics and gases, and oxidizes iron
and manganese? This process includes the incorporation of air into the water by
means of spray nozzles , steps or cascades, or trays of diffusers? - ANSWER:
Aeration
2. TCEQ regulation states that Shore installations , marinas, boats and houses on
the watershed must have sewage? - ANSWER: disposal
3. Water aerated or chlorinated at proper pH levels oxidizes the iron and
manganese, turning them into solid? - ANSWER: particles
4. Well casing and cementing protect the well from collapse and surface ? -
ANSWER: contamination
5. Sequestering does not remove iron from the water, but prevents it from
combining with oxygen and? - ANSWER: reddening
6. The quantity of water a formation yields depends on the formations thickness
and? - ANSWER: permeability
7. Cascade aerators, packed air-stripping towers, and air diffusers are used to
aerate? - ANSWER: water
8. Aeration can be used to remove what from the water supply? - ANSWER: iron
and manganese
9. Hydrogen sulfide has a rotten egg odor and is oxidized by? - ANSWER: super-
chlorination
10. When Iron levels get this high, it can cause red stains on clothing, colored water,
or turbidity? - ANSWER: 0.3 mg/L
11. Excess Manganese can cause? - ANSWER: black stains
12. Another method of iron control is the use of? - ANSWER: sequestering agents
13. What is a sequestering agent? - ANSWER: polyphosphates
14. Well water is sometimes? - ANSWER: corrosive
#$%^&*
)(*&^%$
#$%^&*
, 2025 TEXAS CLASS D WATER LICENSE
|QUESTIONS WITH 100% ANSWERS|GRADED A+
15. Low ph, dissolved gases, high temperatures, and high mineral levels can cause
well water to be? - ANSWER: corrosive
16. What is the process of removing calcium and magnesium by adding lime or by
exchanging ions? - ANSWER: softening
17. An ion exchange replaces calcium ions with? - ANSWER: sodium ions
18. A process available for removing arsenic, fluoride, lead, mercury, nitrate, and
silver from raw water is? - ANSWER: coagulation followed by sedimentation
and filtration
19. A process that forces water through a membrane is? - ANSWER: reverse
osmosis
20. In reverse osmosis a sheet of synthetic material (membrane) under pressure
prevents passage of dissolved materials and larger particles and ejects them in
a? - ANSWER: waste stream
21. The Surface Water Treatment Rule (SWTR) requires community and non-
community wells, springs, and infiltration galleries ( a subsurface tunnel that
collects groundwater) to determine possible direct influence of? - ANSWER:
surface water
22. Changes in groundwater quality can indicate influence of surface water
organisms such as giardia cysts, algae or other? - ANSWER: microorganisms
23. If well is deeper than 50 feet and more than 200 feet from a nearby surface water
body, extensive evaluation of the influence of surface water on a water supply is?
- ANSWER: not required
24. Surface water evaluations are needed on a water supply when shifts in water
quality occur such as turbidity, temperature, pH, and the presence of? -
ANSWER: surface water organisms
25. What are underground, water-bearing formations yielding useful quantities of
water? - ANSWER: Aquifers
26. Problems caused by what are declining water levels and subsidence (sinking of
land)? - ANSWER: over pumping
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)(*&^%$
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