Texas Class D Water License Exam 2026 Prep Test Bank –
A Review of 550+ Questions with Correct Answers (New!)
TX Class D License Exam Prep Latest 2026-2027 Test Bank
T/F: A Class "D" license is valid for 2 years at ground and purchase water systems
with 250 connections or less. - ANSWER-False (3 years)
Fecal Coliform organisms sometimes found in water supplies are an indication
that?
A. The water Supply is Contaminated
B. Harmful Bacteria may be present
C. Possible pathogenic organisms are in the water
D. The water is unsuitable for drinking
E. All of the above - ANSWER-E. All of the above
A disease that may be spread by inadequately disinfected water is - ANSWER-
Dysentery
Water must be disinfected, delivered at inadequate pressure, and be ample in
quantity. (true/false) - ANSWER-false (adequate pressure)
EPA requires a water system to keep a copy of each consumer confidence report at
least _____ years. - ANSWER-5 years
1
,In Texas, water operator licensing is administered by the _____. - ANSWER-
TCEQ
All public water systems are required to employ licensed operators even if the
system only _____ treated water bought from another source. - ANSWER-
redistributes treated water
T/F: In Texas, about 75% of all water is used for commercial, industrial, or
agricultural purposes. - ANSWER-True
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
2
,Water covers approximately ________ of Earth's surface. - ANSWER-71%
Drought is an extended period when a region receives a deficiency in its ________
water supply. - ANSWER-atmospheric, ground, or surface
T/F: Only about 1 gallon of tap water per person/day is used for drinking and
cooking - ANSWER-True
The water utility field affects everyone because _____. - ANSWER-water is
essential to life and health
A public water system provides the public with piped water for human
consumption, serves at least _____ service connections, and regularly serves at
least _____ individuals daily at least _____ days out of the year. - ANSWER-15
service connections
25 individuals
60 days out of the year
Public water systems include cities, municipal utility districts, rural water supply
corporations, mobile home parks, and _____. - ANSWER-campgrounds
Examples of community water systems include ________.
a. municipalities
b. municipal utility districts
c. rural water supply corporations
d. mobile home parks
e. all the above - ANSWER-e. all of the above
3
, A federal agency impacting the water utility industry is the _____. - ANSWER-
EPA
The most important federal law impacting the water utility industry is the _____. -
ANSWER-Safe Drinking Water Act (PL93-523)
The four national safety and quality standards for drinking water covered in the
Safe Drinking Water Act are physical, chemical, ________ and radiological. -
ANSWER-bacteriological
The state agency that regulates drinking water in Texas and administers the federal
Safe Drinking Water Act is the ________. - ANSWER-TCEQ
Excluding outside water use, the average household uses about _______ gallons of
water per month for inside use - ANSWER-2,000
T/F: Only 3% of all the fresh water on earth can be easily accessed for use. -
ANSWER-False (only 1%)
T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the
Safe Drinking Water Act from the EPA. - ANSWER-True
T/F: PWS officials should be pro-active in their approach to terrorism. -
ANSWER-True
_________ permits the owner of a well to pump as much water as desired, even if
the water is drained from beneath the land of others. - ANSWER-Rule of Capture
4
A Review of 550+ Questions with Correct Answers (New!)
TX Class D License Exam Prep Latest 2026-2027 Test Bank
T/F: A Class "D" license is valid for 2 years at ground and purchase water systems
with 250 connections or less. - ANSWER-False (3 years)
Fecal Coliform organisms sometimes found in water supplies are an indication
that?
A. The water Supply is Contaminated
B. Harmful Bacteria may be present
C. Possible pathogenic organisms are in the water
D. The water is unsuitable for drinking
E. All of the above - ANSWER-E. All of the above
A disease that may be spread by inadequately disinfected water is - ANSWER-
Dysentery
Water must be disinfected, delivered at inadequate pressure, and be ample in
quantity. (true/false) - ANSWER-false (adequate pressure)
EPA requires a water system to keep a copy of each consumer confidence report at
least _____ years. - ANSWER-5 years
1
,In Texas, water operator licensing is administered by the _____. - ANSWER-
TCEQ
All public water systems are required to employ licensed operators even if the
system only _____ treated water bought from another source. - ANSWER-
redistributes treated water
T/F: In Texas, about 75% of all water is used for commercial, industrial, or
agricultural purposes. - ANSWER-True
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
2
,Water covers approximately ________ of Earth's surface. - ANSWER-71%
Drought is an extended period when a region receives a deficiency in its ________
water supply. - ANSWER-atmospheric, ground, or surface
T/F: Only about 1 gallon of tap water per person/day is used for drinking and
cooking - ANSWER-True
The water utility field affects everyone because _____. - ANSWER-water is
essential to life and health
A public water system provides the public with piped water for human
consumption, serves at least _____ service connections, and regularly serves at
least _____ individuals daily at least _____ days out of the year. - ANSWER-15
service connections
25 individuals
60 days out of the year
Public water systems include cities, municipal utility districts, rural water supply
corporations, mobile home parks, and _____. - ANSWER-campgrounds
Examples of community water systems include ________.
a. municipalities
b. municipal utility districts
c. rural water supply corporations
d. mobile home parks
e. all the above - ANSWER-e. all of the above
3
, A federal agency impacting the water utility industry is the _____. - ANSWER-
EPA
The most important federal law impacting the water utility industry is the _____. -
ANSWER-Safe Drinking Water Act (PL93-523)
The four national safety and quality standards for drinking water covered in the
Safe Drinking Water Act are physical, chemical, ________ and radiological. -
ANSWER-bacteriological
The state agency that regulates drinking water in Texas and administers the federal
Safe Drinking Water Act is the ________. - ANSWER-TCEQ
Excluding outside water use, the average household uses about _______ gallons of
water per month for inside use - ANSWER-2,000
T/F: Only 3% of all the fresh water on earth can be easily accessed for use. -
ANSWER-False (only 1%)
T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the
Safe Drinking Water Act from the EPA. - ANSWER-True
T/F: PWS officials should be pro-active in their approach to terrorism. -
ANSWER-True
_________ permits the owner of a well to pump as much water as desired, even if
the water is drained from beneath the land of others. - ANSWER-Rule of Capture
4
