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TEXAS WASTEWATER CLASS D EXAM LATEST 2026 ACTUAL EXAM
WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
Most surface water is low in minerals, gases, and ________.
a. algae
b. turbidity
c. dissolved solids
d. bacteria - ANSWER-c. dissolved solids
Quality water has low amounts of color, turbidity, solids, and
________.
a. oxygen
b. taste and odor
c. hydrogen
d. all listed - ANSWER-b. taste and odor
Pretreatment includes lake destratification, control of algae, debris
removal, presedimentation, aeration, ________, and activated
carbon adsorption. - ANSWER-chemical oxidation
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Copper sulfate in dosages of ________ and approved algaecides
control algae blooms.
a. 10 to 50 mg/L
b. 1 to 5 mg/L
c. 0.1 to 0.5 mg/L
d. 0.01 to 0.05 mg/L - ANSWER-c. 0.1 to 0.5 mg/L
The most effective treatment for taste and odor is adsorption with
________. - ANSWER-activated carbon
Lime is applied to water to adjust ________. - ANSWER-adjust
pH or alkalinity
The process of using chemicals to clot particles together is called
_____ and _____. - ANSWER-coagulation and flocculation
Detention time in sedimentation basins must be at least ________
hours to allow floc to settle. - ANSWER-6
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Factors affecting sedimentation are weight of the floc, ________,
detention time, and short-circuiting.
a. water temperature
b. water velocity
c. taste and odor
d. a and b - ANSWER-d. water temperature and water velocity
Backwashing should expand the filter bed by ________%. -
ANSWER-30 to 50
A common filter problem is ________, prevented by proper
backwashing. - ANSWER-mud balls
Chemicals used in disinfection are chloramine, chlorine, chlorine
dioxide, and ________. - ANSWER-ozone
Disinfection destroys disease-causing microorganisms called
_____. - ANSWER-pathogens
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Disinfection destroys pathogens without sterilizing the water.
(true/false) - ANSWER-true
Waterborne pathogens live and grow in the intestines of infected
people. (true/false) - ANSWER-true
_____ fecal matter entering a water supply transmits pathogens
to healthy people. - ANSWER-Infected
Some diseases transmitted by unsafe water include typhoid,
dysentery, cholera, measles, polio, and cryptosporidiosis.
(true/false) - ANSWER-false (measles is not transmitted this way)
Each water sample is tested for all waterborne diseases.
(true/false) - ANSWER-false (not all)
Water samples are tested for microorganisms that indicate _____
contamination. - ANSWER-fecal contamination
TEXAS WASTEWATER CLASS D EXAM LATEST 2026 ACTUAL EXAM
WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
Most surface water is low in minerals, gases, and ________.
a. algae
b. turbidity
c. dissolved solids
d. bacteria - ANSWER-c. dissolved solids
Quality water has low amounts of color, turbidity, solids, and
________.
a. oxygen
b. taste and odor
c. hydrogen
d. all listed - ANSWER-b. taste and odor
Pretreatment includes lake destratification, control of algae, debris
removal, presedimentation, aeration, ________, and activated
carbon adsorption. - ANSWER-chemical oxidation
,2|Page
Copper sulfate in dosages of ________ and approved algaecides
control algae blooms.
a. 10 to 50 mg/L
b. 1 to 5 mg/L
c. 0.1 to 0.5 mg/L
d. 0.01 to 0.05 mg/L - ANSWER-c. 0.1 to 0.5 mg/L
The most effective treatment for taste and odor is adsorption with
________. - ANSWER-activated carbon
Lime is applied to water to adjust ________. - ANSWER-adjust
pH or alkalinity
The process of using chemicals to clot particles together is called
_____ and _____. - ANSWER-coagulation and flocculation
Detention time in sedimentation basins must be at least ________
hours to allow floc to settle. - ANSWER-6
,3|Page
Factors affecting sedimentation are weight of the floc, ________,
detention time, and short-circuiting.
a. water temperature
b. water velocity
c. taste and odor
d. a and b - ANSWER-d. water temperature and water velocity
Backwashing should expand the filter bed by ________%. -
ANSWER-30 to 50
A common filter problem is ________, prevented by proper
backwashing. - ANSWER-mud balls
Chemicals used in disinfection are chloramine, chlorine, chlorine
dioxide, and ________. - ANSWER-ozone
Disinfection destroys disease-causing microorganisms called
_____. - ANSWER-pathogens
, 4|Page
Disinfection destroys pathogens without sterilizing the water.
(true/false) - ANSWER-true
Waterborne pathogens live and grow in the intestines of infected
people. (true/false) - ANSWER-true
_____ fecal matter entering a water supply transmits pathogens
to healthy people. - ANSWER-Infected
Some diseases transmitted by unsafe water include typhoid,
dysentery, cholera, measles, polio, and cryptosporidiosis.
(true/false) - ANSWER-false (measles is not transmitted this way)
Each water sample is tested for all waterborne diseases.
(true/false) - ANSWER-false (not all)
Water samples are tested for microorganisms that indicate _____
contamination. - ANSWER-fecal contamination
