TCEQ WASTEWATER (CLASS D) LICENSE
PREP FINAL EXAM 2026 QUESTIONS AND
CORRECT ANSWERS 3 VERSIONS
CURRENTLY TESTING COMPLETE
QUESTIONS WITH DETAILED VERIFIED
ANSWERS /ALREADY GRADED A+
The magnetic meter works by the law of ________ - CORRECT
ANSWER ✔✔- Induction
How often do you calibrate flow measuring devices? - CORRECT
ANSWER ✔✔- Annually
Primary clarifiers should remove _____ percent of the incoming BOD -
CORRECT ANSWER ✔✔- 35%
Primary sludge is about ________% water and _______% solids -
CORRECT ANSWER ✔✔- 94-96% water, and 4-6% solids
Primary clarifiers should remove ____ % of the BOD and _____% of
the settleable solids - CORRECT ANSWER ✔✔- 35%, 90-95%
,Usual blanket depth in a secondary clarifier is no more than ____ of the
sidewall depth - CORRECT ANSWER ✔✔- 1/4
When sludge is within _____ inches of the slot, withdraw sludge -
CORRECT ANSWER ✔✔- 18 inches
Microorganisms including bacteria, protozoa, fungi, and microscopic
animals, feed on the organic waste and can remove_________% of the
BOD from wastewater - CORRECT ANSWER ✔✔- 92-99%
A return sludge pumping system must be capable of pumping at least
______ gpd/sf but not more than______ gpd/sf - CORRECT ANSWER
✔✔- 200gpd/sf, 400gpd/sf
Minimum velocity required to keep solids in suspension? - CORRECT
ANSWER ✔✔- 2ft/sec
Minimum required velocity a inverted siphon requires? - CORRECT
ANSWER ✔✔- 3ft/sec
Two most common pipe materials used in the collection system? -
CORRECT ANSWER ✔✔- Clay & PVC
OSHA minimum standards for shoring, sloping, or trench boxes are? -
CORRECT ANSWER ✔✔- 5ft or deeper
,If the trench is _____ or deeper, use a portable ladder or other means of
exit. - CORRECT ANSWER ✔✔- 4ft or deeper
The ladder most extend ____ feet above the trench and be secured. -
CORRECT ANSWER ✔✔- 3ft
Ladders must be within ____ feet of trench workers and not more than
____ feet apart. - CORRECT ANSWER ✔✔- 25ft, 50ft
The excavation spoil must be at least? - CORRECT ANSWER ✔✔- 2ft
from the edge of the trench
Which type of pump is most often used in a lift station? - CORRECT
ANSWER ✔✔- Centrifugal Pump
What is CMOM? - CORRECT ANSWER ✔✔- Capacity, management,
operations, and maintenance
Install water lines no closer to a water line than ____ feet - CORRECT
ANSWER ✔✔- 9ft
Chlorine helps ______ grease, making it easy to skim - CORRECT
ANSWER ✔✔- Congeal
, What are the two ways to maintain the microorganism balance? -
CORRECT ANSWER ✔✔- Food to Microorganism ratio (F/M) &
Mean Cell Residence Time (MCRT)
Waste Water D license Study
Water Resources in Texas includes lakes, rivers, bays, estuaries,
wetlands, ground water, and storm (1-3) - CORRECT ANSWER ✔✔-
False
Water Polluntants include organic and inorganic material, heat, and
radiation (1-4) - CORRECT ANSWER ✔✔- True
In Texas, Clean water is needed to provide for human comsumption and
recreation, Maintain aquatic habitats for wildlife, recharge ground water,
and provide for industry. (1-4) - CORRECT ANSWER ✔✔- False
Two sources of water contamination are discharges and non- point
source discharges (1-4) - CORRECT ANSWER ✔✔- False
Examples of point-source discharges are: - CORRECT ANSWER ✔✔-
Municipal, industrial, and agricultural wastewater treatment facilities
PREP FINAL EXAM 2026 QUESTIONS AND
CORRECT ANSWERS 3 VERSIONS
CURRENTLY TESTING COMPLETE
QUESTIONS WITH DETAILED VERIFIED
ANSWERS /ALREADY GRADED A+
The magnetic meter works by the law of ________ - CORRECT
ANSWER ✔✔- Induction
How often do you calibrate flow measuring devices? - CORRECT
ANSWER ✔✔- Annually
Primary clarifiers should remove _____ percent of the incoming BOD -
CORRECT ANSWER ✔✔- 35%
Primary sludge is about ________% water and _______% solids -
CORRECT ANSWER ✔✔- 94-96% water, and 4-6% solids
Primary clarifiers should remove ____ % of the BOD and _____% of
the settleable solids - CORRECT ANSWER ✔✔- 35%, 90-95%
,Usual blanket depth in a secondary clarifier is no more than ____ of the
sidewall depth - CORRECT ANSWER ✔✔- 1/4
When sludge is within _____ inches of the slot, withdraw sludge -
CORRECT ANSWER ✔✔- 18 inches
Microorganisms including bacteria, protozoa, fungi, and microscopic
animals, feed on the organic waste and can remove_________% of the
BOD from wastewater - CORRECT ANSWER ✔✔- 92-99%
A return sludge pumping system must be capable of pumping at least
______ gpd/sf but not more than______ gpd/sf - CORRECT ANSWER
✔✔- 200gpd/sf, 400gpd/sf
Minimum velocity required to keep solids in suspension? - CORRECT
ANSWER ✔✔- 2ft/sec
Minimum required velocity a inverted siphon requires? - CORRECT
ANSWER ✔✔- 3ft/sec
Two most common pipe materials used in the collection system? -
CORRECT ANSWER ✔✔- Clay & PVC
OSHA minimum standards for shoring, sloping, or trench boxes are? -
CORRECT ANSWER ✔✔- 5ft or deeper
,If the trench is _____ or deeper, use a portable ladder or other means of
exit. - CORRECT ANSWER ✔✔- 4ft or deeper
The ladder most extend ____ feet above the trench and be secured. -
CORRECT ANSWER ✔✔- 3ft
Ladders must be within ____ feet of trench workers and not more than
____ feet apart. - CORRECT ANSWER ✔✔- 25ft, 50ft
The excavation spoil must be at least? - CORRECT ANSWER ✔✔- 2ft
from the edge of the trench
Which type of pump is most often used in a lift station? - CORRECT
ANSWER ✔✔- Centrifugal Pump
What is CMOM? - CORRECT ANSWER ✔✔- Capacity, management,
operations, and maintenance
Install water lines no closer to a water line than ____ feet - CORRECT
ANSWER ✔✔- 9ft
Chlorine helps ______ grease, making it easy to skim - CORRECT
ANSWER ✔✔- Congeal
, What are the two ways to maintain the microorganism balance? -
CORRECT ANSWER ✔✔- Food to Microorganism ratio (F/M) &
Mean Cell Residence Time (MCRT)
Waste Water D license Study
Water Resources in Texas includes lakes, rivers, bays, estuaries,
wetlands, ground water, and storm (1-3) - CORRECT ANSWER ✔✔-
False
Water Polluntants include organic and inorganic material, heat, and
radiation (1-4) - CORRECT ANSWER ✔✔- True
In Texas, Clean water is needed to provide for human comsumption and
recreation, Maintain aquatic habitats for wildlife, recharge ground water,
and provide for industry. (1-4) - CORRECT ANSWER ✔✔- False
Two sources of water contamination are discharges and non- point
source discharges (1-4) - CORRECT ANSWER ✔✔- False
Examples of point-source discharges are: - CORRECT ANSWER ✔✔-
Municipal, industrial, and agricultural wastewater treatment facilities
