Texas waste water class d
newest 2024-2025 actual exam
complete 450 questions and
correct detailed
answers(verified answers)
already graded a+
Examples of community water systems include ________.
a. municipalities
b. municipal utility districts
c. rural water supply corporations
d. mobile home parks
e. all the aboveANSWER➖e. all of the above
Organic matter includes ________.ANSWER➖plants, animals,
humans
The most important treatment process is ________, which
destroys disease-causing
organisms.ANSWER➖disinfection
2 | P a g e
Public water systems are required to compile a monthly report
showing ________.ANSWER➖dates of dead-end flushing
Most groundwater is relatively free of suspended matter, but
________ can be a major
problem in surface water.ANSWER➖turbidity
Color in a public water supply should be
________.ANSWER➖less than 15 units
Chemical characteristics include hardness, pH, solids, and
________.ANSWER➖gases
Water is considered hard when it exceeds ________ mg/L of
calcium carbonate.ANSWER➖c. 100
A gallon of water weighs 8.34 pounds and 1 mg/L equals one
________.ANSWER➖part per million
Hydrogen sulfide is heavier than air, colorless, flammable, toxic,
and has a ________ odor.ANSWER➖b. rotten egg
Excessive nitrates in drinking water can cause ________
syndrome in infants.ANSWER➖blue baby
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