WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
Activated Carbon Beds remove what? - ANSWERS-dissolved organics
Extended aeration is a _____ process that requires little operator
interaction. - ANSWERS-simple
Activated Sludge - Extended Aeration has 3 major phases: -
ANSWERS-logarithmic growth phase, declining growth phase, and the
endogenous phase
Allowable leakage in a new collection system can be tested by ___, ___,
and ___. - ANSWERS-low pressure air, exfiltration test, infiltration test.
When Potable water is used for a hydraulic seal on a pump it should
have - ANSWERS-an air gap.
In a trickling filter, solids removal is affected by the ___ ___. -
ANSWERS-return rate.
END OF
PAGE
1
, WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
Git is washed in a snail to - ANSWERS-wash off organics.
A good Primary Clarifier removes __ to __% of settable solids. -
ANSWERS-90 to 95%
Good Sludge has Lots of __ & ___ ___, a Few ___ and __. -
ANSWERS-ciliates & free swimmers, a few rotifers, and flagellates.
What process is used to re-seed Aeration Basins and remove solids from
Secondary Claifires? - ANSWERS-Return Activated Sludge (RAS)
An Sludge Volume Index (SVI) number of ___ is an indication of sludge
bulking. - ANSWERS-180 mL/g
Digesters show improvement by an increase in ____ and a decrease in
___. - ANSWERS-methane, CO2
Primary treatment uses ____ to treat. - ANSWERS-gravity
END OF
PAGE
2
, WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
___ and below is an oxygen deficient atmosphere. - ANSWERS-19.5%
The name of the State Agency responsible for enforcing pollution
control laws in Texas - ANSWERS-Texas Commission of
Environmental Quality
The term pathogenic means - ANSWERS-Capable of causing disease
The minimum separation between sewer lines and potable water lines is
- ANSWERS-9 feet
A licensed wastewater operator is a professional - ANSWERS-
consistently does best job possible, practices personal safety, strives to
improve job knowledge, strives to keep the plant and collection system
in the best appearance and working order
END OF
PAGE
3
, WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
An important step in testing a sample for Total Suspended Solids is -
ANSWERS-Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on -
ANSWERS-Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a
treatment plant tells the operator - ANSWERS-How the plant was
operating 5 days ago
Which of the following are dangerous gasses that are likely to be present
in lift stations and manholes? - ANSWERS-Natural gas, gasoline fumes,
hydrogen sulfide and carbon dioxide
A preferred hydraulic method of cleaning sewer lines is - ANSWERS-
Hydro Jet Cleaner
END OF
PAGE
4
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
Activated Carbon Beds remove what? - ANSWERS-dissolved organics
Extended aeration is a _____ process that requires little operator
interaction. - ANSWERS-simple
Activated Sludge - Extended Aeration has 3 major phases: -
ANSWERS-logarithmic growth phase, declining growth phase, and the
endogenous phase
Allowable leakage in a new collection system can be tested by ___, ___,
and ___. - ANSWERS-low pressure air, exfiltration test, infiltration test.
When Potable water is used for a hydraulic seal on a pump it should
have - ANSWERS-an air gap.
In a trickling filter, solids removal is affected by the ___ ___. -
ANSWERS-return rate.
END OF
PAGE
1
, WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
Git is washed in a snail to - ANSWERS-wash off organics.
A good Primary Clarifier removes __ to __% of settable solids. -
ANSWERS-90 to 95%
Good Sludge has Lots of __ & ___ ___, a Few ___ and __. -
ANSWERS-ciliates & free swimmers, a few rotifers, and flagellates.
What process is used to re-seed Aeration Basins and remove solids from
Secondary Claifires? - ANSWERS-Return Activated Sludge (RAS)
An Sludge Volume Index (SVI) number of ___ is an indication of sludge
bulking. - ANSWERS-180 mL/g
Digesters show improvement by an increase in ____ and a decrease in
___. - ANSWERS-methane, CO2
Primary treatment uses ____ to treat. - ANSWERS-gravity
END OF
PAGE
2
, WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
___ and below is an oxygen deficient atmosphere. - ANSWERS-19.5%
The name of the State Agency responsible for enforcing pollution
control laws in Texas - ANSWERS-Texas Commission of
Environmental Quality
The term pathogenic means - ANSWERS-Capable of causing disease
The minimum separation between sewer lines and potable water lines is
- ANSWERS-9 feet
A licensed wastewater operator is a professional - ANSWERS-
consistently does best job possible, practices personal safety, strives to
improve job knowledge, strives to keep the plant and collection system
in the best appearance and working order
END OF
PAGE
3
, WASTEWATER CLASS B LATEST
TEXAS EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
An important step in testing a sample for Total Suspended Solids is -
ANSWERS-Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on -
ANSWERS-Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a
treatment plant tells the operator - ANSWERS-How the plant was
operating 5 days ago
Which of the following are dangerous gasses that are likely to be present
in lift stations and manholes? - ANSWERS-Natural gas, gasoline fumes,
hydrogen sulfide and carbon dioxide
A preferred hydraulic method of cleaning sewer lines is - ANSWERS-
Hydro Jet Cleaner
END OF
PAGE
4
