TCEQ WASTEWATER CLASS D LICENSE FINAL
STUDY GUIDE 2026 PRACTICE QUESTIONS
ANSWERS
◉ Before starting construction, the utility must submit engineering
plans to the AWWA. (true/false) Answer: false (plans must be
submitted to TCEQ)
◉ Operators must keep records of water usage, system pressure,
sample results, chlorine use, repairs, and maintenance. (true/false)
Answer: true
◉ Surface water systems must mail reports to the TCEQ in Austin by
the 5th of the following month. (true/false) Answer: by the 10th
◉ Water is always found pure in nature. (true/false) Answer: false
◉ Physical characteristics of water are temperature, turbidity, color,
taste, odor, and pH. (true/false) Answer: false (pH is a chemical
characteristic)
◉ _____ is the amount of suspended matter such as clay, silt, organic
matter, and microorganisms in the water. Answer: Turbidity
,◉ Color in water can result from _____ or _____. Answer: mineral or
organic matter
◉ True color is dissolved in water (in solution) and can be removed
by filtration. (true/false) Answer: false
◉ Red water caused by oxidized iron is in suspension (apparent
color) and cannot be removed by filtering. (true/false) Answer: false
◉ Taste and odor comes from algae, bacteria, organic matter, gases,
and chemicals. (true/false) Answer: true
◉ Surface water supplies should be sampled for chemical analysis
every year and groundwater supplies should be sampled _____.
Answer: every 3 years
◉ _____ and _____ and other minerals cause hardness in water.
Answer: Calcium and magnesium
◉ The pH scale ranges from _____ to _____. Answer: 0 to 14
◉ A pH of _____ is neutral. Answer: 7 is neutral
,◉ Common gases found in water include hydrogen sulfide, carbon
dioxide, methane, and sodium chloride. (true/false) Answer: false
(sodium chloride is table salt)
◉ Chemically, water is made of ________. Answer: 2 atoms of hydrogen
and 1 atom of oxygen
◉ The hydrologic cycle is ________.
a. nature's way of recycling water
b. equipment used to measure distances
c. the way water filters through the earth
d. the process by which water runs into rivers and lakes Answer: a.
nature's way of recycling water
◉ The quality standard for public water supplies is based on the use
of water for ________. Answer: drinking
◉ One of the most important purposes of a public water supply is
_______.
a. swimming
b. landscape watering
c. car washing
d. firefighting Answer: d. firefighting
, ◉ Organic matter includes ________.
a. sand
b. plants, animals and humans
c. minerals
d. all listed Answer: b. plants, animals and humans
◉ The most important treatment process is ________, which destroys
disease-causing organisms.
a. filtration
b. disinfection
c. softening
d. fluoridation Answer: b. disinfection
◉ Public water systems are required to compile a monthly report
showing ________.
a. rate increases
b. accidents
c. dates of dead-end flushing
d. disciplinary action Answer: c. dates of dead-end flushing
STUDY GUIDE 2026 PRACTICE QUESTIONS
ANSWERS
◉ Before starting construction, the utility must submit engineering
plans to the AWWA. (true/false) Answer: false (plans must be
submitted to TCEQ)
◉ Operators must keep records of water usage, system pressure,
sample results, chlorine use, repairs, and maintenance. (true/false)
Answer: true
◉ Surface water systems must mail reports to the TCEQ in Austin by
the 5th of the following month. (true/false) Answer: by the 10th
◉ Water is always found pure in nature. (true/false) Answer: false
◉ Physical characteristics of water are temperature, turbidity, color,
taste, odor, and pH. (true/false) Answer: false (pH is a chemical
characteristic)
◉ _____ is the amount of suspended matter such as clay, silt, organic
matter, and microorganisms in the water. Answer: Turbidity
,◉ Color in water can result from _____ or _____. Answer: mineral or
organic matter
◉ True color is dissolved in water (in solution) and can be removed
by filtration. (true/false) Answer: false
◉ Red water caused by oxidized iron is in suspension (apparent
color) and cannot be removed by filtering. (true/false) Answer: false
◉ Taste and odor comes from algae, bacteria, organic matter, gases,
and chemicals. (true/false) Answer: true
◉ Surface water supplies should be sampled for chemical analysis
every year and groundwater supplies should be sampled _____.
Answer: every 3 years
◉ _____ and _____ and other minerals cause hardness in water.
Answer: Calcium and magnesium
◉ The pH scale ranges from _____ to _____. Answer: 0 to 14
◉ A pH of _____ is neutral. Answer: 7 is neutral
,◉ Common gases found in water include hydrogen sulfide, carbon
dioxide, methane, and sodium chloride. (true/false) Answer: false
(sodium chloride is table salt)
◉ Chemically, water is made of ________. Answer: 2 atoms of hydrogen
and 1 atom of oxygen
◉ The hydrologic cycle is ________.
a. nature's way of recycling water
b. equipment used to measure distances
c. the way water filters through the earth
d. the process by which water runs into rivers and lakes Answer: a.
nature's way of recycling water
◉ The quality standard for public water supplies is based on the use
of water for ________. Answer: drinking
◉ One of the most important purposes of a public water supply is
_______.
a. swimming
b. landscape watering
c. car washing
d. firefighting Answer: d. firefighting
, ◉ Organic matter includes ________.
a. sand
b. plants, animals and humans
c. minerals
d. all listed Answer: b. plants, animals and humans
◉ The most important treatment process is ________, which destroys
disease-causing organisms.
a. filtration
b. disinfection
c. softening
d. fluoridation Answer: b. disinfection
◉ Public water systems are required to compile a monthly report
showing ________.
a. rate increases
b. accidents
c. dates of dead-end flushing
d. disciplinary action Answer: c. dates of dead-end flushing
