TEXAS CLASS D WATER LICENSE COMPLETE EXAM STUDY
GUIDE WITH PRACTICE QUESTIONS AND VERIFIED ANSWERS
2025–2026
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? - correct answer -Aeration
TCEQ regulation states that Shore installations , marinas, boats and houses on the watershed
must have sewage? - correct answer -disposal
Water aerated or chlorinated at proper pH levels oxidizes the iron and manganese, turning them
into solid? - correct answer -particles
Well casing and cementing protect the well from collapse and surface ? - correct answer -
contamination
Sequestering does not remove iron from the water, but prevents it from combining with oxygen
and? - correct answer -reddening
The quantity of water a formation yields depends on the formations thickness and? - correct
answer -permeability
Cascade aerators, packed air-stripping towers, and air diffusers are used to aerate? - correct
answer -water
Aeration can be used to remove what from the water supply? - correct answer -iron and
manganese
,Hydrogen sulfide has a rotten egg odor and is oxidized by? - correct answer -super-chlorination
When Iron levels get this high, it can cause red stains on clothing, colored water, or turbidity? -
correct answer -0.3 mg/L
Excess Manganese can cause? - correct answer -black stains
Another method of iron control is the use of? - correct answer -sequestering agents
What is a sequestering agent? - correct answer -polyphosphates
Well water is sometimes? - correct answer -corrosive
Low ph, dissolved gases, high temperatures, and high mineral levels can cause well water to be?
- correct answer -corrosive
What is the process of removing calcium and magnesium by adding lime or by exchanging ions?
- correct answer -softening
An ion exchange replaces calcium ions with? - correct answer -sodium ions
A process available for removing arsenic, fluoride, lead, mercury, nitrate, and silver from raw
water is? - correct answer -coagulation followed by sedimentation and filtration
A process that forces water through a membrane is? - correct answer -reverse osmosis
, In reverse osmosis a sheet of synthetic material (membrane) under pressure prevents passage
of dissolved materials and larger particles and ejects them in a? - correct answer -waste stream
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? - correct answer -surface water
Changes in groundwater quality can indicate influence of surface water organisms such as
giardia cysts, algae or other? - correct answer -microorganisms
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? - correct answer -
not required
Surface water evaluations are needed on a water supply when shifts in water quality occur such
as turbidity, temperature, pH, and the presence of? - correct answer -surface water organisms
What are underground, water-bearing formations yielding useful quantities of water? - correct
answer -Aquifiers
Problems caused by what are declining water levels and subsidence (sinking of land)? - correct
answer -overpumping
The purpose of the well screen is to keep out birds and? - correct answer -sand
the most important feature of the well screen is the size of the? - correct answer -opening
The mesh size of the screen is determined by the size of the aquifer material, the size of the
gravel in the gravel pack, and the type of well ? - correct answer -development
GUIDE WITH PRACTICE QUESTIONS AND VERIFIED ANSWERS
2025–2026
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? - correct answer -Aeration
TCEQ regulation states that Shore installations , marinas, boats and houses on the watershed
must have sewage? - correct answer -disposal
Water aerated or chlorinated at proper pH levels oxidizes the iron and manganese, turning them
into solid? - correct answer -particles
Well casing and cementing protect the well from collapse and surface ? - correct answer -
contamination
Sequestering does not remove iron from the water, but prevents it from combining with oxygen
and? - correct answer -reddening
The quantity of water a formation yields depends on the formations thickness and? - correct
answer -permeability
Cascade aerators, packed air-stripping towers, and air diffusers are used to aerate? - correct
answer -water
Aeration can be used to remove what from the water supply? - correct answer -iron and
manganese
,Hydrogen sulfide has a rotten egg odor and is oxidized by? - correct answer -super-chlorination
When Iron levels get this high, it can cause red stains on clothing, colored water, or turbidity? -
correct answer -0.3 mg/L
Excess Manganese can cause? - correct answer -black stains
Another method of iron control is the use of? - correct answer -sequestering agents
What is a sequestering agent? - correct answer -polyphosphates
Well water is sometimes? - correct answer -corrosive
Low ph, dissolved gases, high temperatures, and high mineral levels can cause well water to be?
- correct answer -corrosive
What is the process of removing calcium and magnesium by adding lime or by exchanging ions?
- correct answer -softening
An ion exchange replaces calcium ions with? - correct answer -sodium ions
A process available for removing arsenic, fluoride, lead, mercury, nitrate, and silver from raw
water is? - correct answer -coagulation followed by sedimentation and filtration
A process that forces water through a membrane is? - correct answer -reverse osmosis
, In reverse osmosis a sheet of synthetic material (membrane) under pressure prevents passage
of dissolved materials and larger particles and ejects them in a? - correct answer -waste stream
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? - correct answer -surface water
Changes in groundwater quality can indicate influence of surface water organisms such as
giardia cysts, algae or other? - correct answer -microorganisms
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? - correct answer -
not required
Surface water evaluations are needed on a water supply when shifts in water quality occur such
as turbidity, temperature, pH, and the presence of? - correct answer -surface water organisms
What are underground, water-bearing formations yielding useful quantities of water? - correct
answer -Aquifiers
Problems caused by what are declining water levels and subsidence (sinking of land)? - correct
answer -overpumping
The purpose of the well screen is to keep out birds and? - correct answer -sand
the most important feature of the well screen is the size of the? - correct answer -opening
The mesh size of the screen is determined by the size of the aquifer material, the size of the
gravel in the gravel pack, and the type of well ? - correct answer -development
