TEXAS CLASS D WATER LICENSE STUDY GUIDE TEST QUESTIONS
WITH ANSWERS 2025/2026 GRADED A+
TCEQ regulation states that Shore installations , marinas, boats and houses on the
watershed must have sewage? - disposal
Water aerated or chlorinated at proper pH levels oxidizes the iron and manganese,
turning them into solid? - particles
Well casing and cementing protect the well from collapse and surface ? - contamination
Sequestering does not remove iron from the water, but prevents it from combining with
oxygen and? - reddening
The quantity of water a formation yields depends on the formations thickness and? -
permeability
Cascade aerators, packed air-stripping towers, and air diffusers are used to aerate? -
water
Aeration can be used to remove what from the water supply? - iron and manganese
Hydrogen sulfide has a rotten egg odor and is oxidized by? - super-chlorination
Rivers, lakes and what are surface water sources? - reservoirs
Texas has how many major river basins - 23
What is the longest running river in Texas? - Rio Grande
A major reservoir contains at least how many acre-feet? - 5,000
One acre foot in a reservoir is an acre by one foot deep and equals how many gallons
of water? - 325,851
The largest reservoir within Texas is? - Sam Rayburn
Bacteria, algae and what are common contaminants of surface water? - chemicals
TCEQ regulation states that septic tanks, absorption fields, sewers, manholes or toilets
cannot be within how many feet of a lake at spillway elevation or the 50-year flood
elevation? - 75
TCEQ regulation states that no boat ramps, marinas, docks, or fishing piers can be
within how many feet of an intake? - 1,000
, TCEQ regulation states all activities shall be restricted within how many feet of an
intake? - 200
Most surface water is low in minerals, gases, and? - dissolved solids
Most surface water is high in turbidity and? - algae
To protect the health of the community, treated water must be free of disease-causing
organisms and harmful chemicals must be reduced to? - safe levels
Water must be low in color, turbidity, suspended solids, temperature and free of? - taste
and odor
Colored water can be caused by organics, algae, iron, or? - manganese
Water should not be corrosive, deposit scale, or stain plumbing in order to protect what?
- consumer property
The following are characteristics of quality water: An absence of harmful chemicals, an
absence of disease-causing organisms, little or no color, turbidity , solids, odor, or taste
and noncorrosive, nonstaining and non-scale forming. - true
Changes in well water levels or the volume of water produced can alert the operator to a
drop in the water table, screen stoppage, or damage to the? - pump
What are 2 common deep well pumps? - submersible and vertical turbine
Gases such as methane , carbon dioxide, and hydrogen sulfide are reduced by? -
aeration
Changes in groundwater quality can indicate influence of surface water organisms such
as giardia cysts, algae or other? - 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? - 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? - surface water
organisms
What are underground, water-bearing formations yielding useful quantities of water? -
Aquifiers
Problems caused by what are declining water levels and subsidence (sinking of land)? -
overpumping
WITH ANSWERS 2025/2026 GRADED A+
TCEQ regulation states that Shore installations , marinas, boats and houses on the
watershed must have sewage? - disposal
Water aerated or chlorinated at proper pH levels oxidizes the iron and manganese,
turning them into solid? - particles
Well casing and cementing protect the well from collapse and surface ? - contamination
Sequestering does not remove iron from the water, but prevents it from combining with
oxygen and? - reddening
The quantity of water a formation yields depends on the formations thickness and? -
permeability
Cascade aerators, packed air-stripping towers, and air diffusers are used to aerate? -
water
Aeration can be used to remove what from the water supply? - iron and manganese
Hydrogen sulfide has a rotten egg odor and is oxidized by? - super-chlorination
Rivers, lakes and what are surface water sources? - reservoirs
Texas has how many major river basins - 23
What is the longest running river in Texas? - Rio Grande
A major reservoir contains at least how many acre-feet? - 5,000
One acre foot in a reservoir is an acre by one foot deep and equals how many gallons
of water? - 325,851
The largest reservoir within Texas is? - Sam Rayburn
Bacteria, algae and what are common contaminants of surface water? - chemicals
TCEQ regulation states that septic tanks, absorption fields, sewers, manholes or toilets
cannot be within how many feet of a lake at spillway elevation or the 50-year flood
elevation? - 75
TCEQ regulation states that no boat ramps, marinas, docks, or fishing piers can be
within how many feet of an intake? - 1,000
, TCEQ regulation states all activities shall be restricted within how many feet of an
intake? - 200
Most surface water is low in minerals, gases, and? - dissolved solids
Most surface water is high in turbidity and? - algae
To protect the health of the community, treated water must be free of disease-causing
organisms and harmful chemicals must be reduced to? - safe levels
Water must be low in color, turbidity, suspended solids, temperature and free of? - taste
and odor
Colored water can be caused by organics, algae, iron, or? - manganese
Water should not be corrosive, deposit scale, or stain plumbing in order to protect what?
- consumer property
The following are characteristics of quality water: An absence of harmful chemicals, an
absence of disease-causing organisms, little or no color, turbidity , solids, odor, or taste
and noncorrosive, nonstaining and non-scale forming. - true
Changes in well water levels or the volume of water produced can alert the operator to a
drop in the water table, screen stoppage, or damage to the? - pump
What are 2 common deep well pumps? - submersible and vertical turbine
Gases such as methane , carbon dioxide, and hydrogen sulfide are reduced by? -
aeration
Changes in groundwater quality can indicate influence of surface water organisms such
as giardia cysts, algae or other? - 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? - 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? - surface water
organisms
What are underground, water-bearing formations yielding useful quantities of water? -
Aquifiers
Problems caused by what are declining water levels and subsidence (sinking of land)? -
overpumping
