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