TCEQ Class D Water Operator License Exam
Questions with Verified Correct Answers| Latest
Update 2024/2025
Monitoring average and maximum daily water ______ enables us to plan ahead for growth. -
✔✔Demand
T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical,
bacteriological, and radiological characteristics. - ✔✔True
"Potable" means water is safe to drink and has a measurable chlorine ________. -
✔✔Residual
The plant operator is responsible for a sufficient supply of safe and ________ drinking water. -
✔✔Palatable
T/F: The Texas State Board of Fire Insurance requires utilities that provide fire protection to
have a minimum amount of water available based on 30 gals per person per day. - ✔✔False
(130 gals per person per day)
T/F: The primary state regulator of water utilities is the TCEQ. - ✔✔True
T/F: All community and non-transient non-community PWS, regardless of source of water, must
be under the supervision of a licensed water works operator. - ✔✔True
Meter readers bring in operating revenue and profoundly impact _____ relations. -
✔✔Public
,The federal regulator of drinking water is the _____. - ✔✔EPA
T/F: Duties of distribution operator include repairing leaks, making taps, flushing mains, and
taking radiological samples. - ✔✔False (Repair leaks, Make taps, Flush mains, Operate
pumps, Take *bacteriological* samples)
A service area has 1000 service connections. What can we estimate the population of this
service area to be? - ✔✔3,000 (multiply connections x 3)
T/F: The State must be notified after an existing facility is changed or after construction of a
new facility. - ✔✔False (must notify *before*)
T/F: A Class "D" license is valid for 2 years at ground and purchase water systems with 250
connections or less. - ✔✔False (3 years)
T/F: The physical characteristics of water are color, taste, odor, temperature, and turbidity. -
✔✔True
An alkaline or basic solution has a pH greater than ____. - ✔✔7
T/F: The terms mg/L and ppm are not interchangeable. - ✔✔False (they are interchangeable)
Suspended solids in water cannot be filtered out. - ✔✔False (they can)
Solids, water hardness, pH and gases are ____ characteristics. - ✔✔Chemical
T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. - ✔✔True
, T/F: The State recommends a water pH of less than 7 to be maintained at all time. - ✔✔False
(The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.)
T/F: Taste and odor can come from organisms such as vegetation, bacteria, and algae, and from
certain chemicals and metals. - ✔✔True
T/F: The deeper the well, the warmer the water. - ✔✔True
T/F: The threshold odor number (TON) relates to the number of dilutions needed for the water
to be tasteless. - ✔✔False (It reflects the number of dilutions needed for water sample to be
*odorless*)
One part per million or 1 mg/L means that for every ____ pounds of water there is one pound
of material in it. - ✔✔1 million
The State requires filtered water to be equal to or less than ____ turbidity units in at least 95%
of the monthly samples. - ✔✔0.3
The State recommends a TON of ___ or less. - ✔✔3
T/F: The State recommends 20 color units or less for a quality water. - ✔✔False (The state
recommends 15 units of color or less for drinking water.)
T/F: Examples of inorganic matter found in water include rock, sand, metals, and minerals. -
✔✔True
T/F: The red color caused by iron is an example of suspended or apparent color and it can be
removed by filtration. - ✔✔True
Questions with Verified Correct Answers| Latest
Update 2024/2025
Monitoring average and maximum daily water ______ enables us to plan ahead for growth. -
✔✔Demand
T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical,
bacteriological, and radiological characteristics. - ✔✔True
"Potable" means water is safe to drink and has a measurable chlorine ________. -
✔✔Residual
The plant operator is responsible for a sufficient supply of safe and ________ drinking water. -
✔✔Palatable
T/F: The Texas State Board of Fire Insurance requires utilities that provide fire protection to
have a minimum amount of water available based on 30 gals per person per day. - ✔✔False
(130 gals per person per day)
T/F: The primary state regulator of water utilities is the TCEQ. - ✔✔True
T/F: All community and non-transient non-community PWS, regardless of source of water, must
be under the supervision of a licensed water works operator. - ✔✔True
Meter readers bring in operating revenue and profoundly impact _____ relations. -
✔✔Public
,The federal regulator of drinking water is the _____. - ✔✔EPA
T/F: Duties of distribution operator include repairing leaks, making taps, flushing mains, and
taking radiological samples. - ✔✔False (Repair leaks, Make taps, Flush mains, Operate
pumps, Take *bacteriological* samples)
A service area has 1000 service connections. What can we estimate the population of this
service area to be? - ✔✔3,000 (multiply connections x 3)
T/F: The State must be notified after an existing facility is changed or after construction of a
new facility. - ✔✔False (must notify *before*)
T/F: A Class "D" license is valid for 2 years at ground and purchase water systems with 250
connections or less. - ✔✔False (3 years)
T/F: The physical characteristics of water are color, taste, odor, temperature, and turbidity. -
✔✔True
An alkaline or basic solution has a pH greater than ____. - ✔✔7
T/F: The terms mg/L and ppm are not interchangeable. - ✔✔False (they are interchangeable)
Suspended solids in water cannot be filtered out. - ✔✔False (they can)
Solids, water hardness, pH and gases are ____ characteristics. - ✔✔Chemical
T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. - ✔✔True
, T/F: The State recommends a water pH of less than 7 to be maintained at all time. - ✔✔False
(The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.)
T/F: Taste and odor can come from organisms such as vegetation, bacteria, and algae, and from
certain chemicals and metals. - ✔✔True
T/F: The deeper the well, the warmer the water. - ✔✔True
T/F: The threshold odor number (TON) relates to the number of dilutions needed for the water
to be tasteless. - ✔✔False (It reflects the number of dilutions needed for water sample to be
*odorless*)
One part per million or 1 mg/L means that for every ____ pounds of water there is one pound
of material in it. - ✔✔1 million
The State requires filtered water to be equal to or less than ____ turbidity units in at least 95%
of the monthly samples. - ✔✔0.3
The State recommends a TON of ___ or less. - ✔✔3
T/F: The State recommends 20 color units or less for a quality water. - ✔✔False (The state
recommends 15 units of color or less for drinking water.)
T/F: Examples of inorganic matter found in water include rock, sand, metals, and minerals. -
✔✔True
T/F: The red color caused by iron is an example of suspended or apparent color and it can be
removed by filtration. - ✔✔True
