TCEQ Wastewater (Class B) License TEST
STUDY GUIDE 2026/2027 COMPLETE
QUESTIONS WITH CORRECT DETAILED
ANSWERS || 100% GUARANTEED PASS
<RECENT VERSION>
1. The name of the State Agency responsible for enforcing pollution control
laws in Texas - ANSWER Texas Commission of Environmental Quality
2. The term pathogenic means - ANSWER Capable of causing disease
3. The minimum separation between sewer lines and potable water lines is -
ANSWER Ideally, 9 feet. At least 2 feet above and 4 feet horizontal.
Separate trenches.
4. A licensed wastewater operator is a professional - ANSWER 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
5. An important step in testing a sample for Total Suspended Solids is -
ANSWER Filtering a sample
6. The Biochemical oxygen Demand (BOD) of a sample is based on -
ANSWER Measuring the dissolved oxygen (DO) used
,7. The results of Biochemical Oxygen Demand (BOD) sample taken at a
treatment plant tells the operator - ANSWER How the plant was operating 5
days ago
8. Which of the following are dangerous gasses that are likely to be present in
lift stations and manholes? - ANSWER Natural gas, gasoline fumes,
hydrogen sulfide and carbon monoxide
9. A preferred hydraulic method of cleaning sewer lines is - ANSWER Hydro
Jet Cleaner
10.Ways to reduce bad odors coming from a collection system - ANSWER
routinely cleaning slow running or low flow lines, adding chlorine or
hydrogen peroxide to the collection system
11.Steps to treating wastewater: - ANSWER 1. Source pretreatment
2. Collection
3. Cross-connection control
4. Preliminary treatment (screening, grit and grease removal)
5. Primary treatment
6. Secondary treatment
7. Advanced treatment (tertiary)
8. Disinfection
9. Discharge
10. Sludge treatment and disposal
12.Unauthorized discharge, overflow, bypass - ANSWER 24 hours for notice; 5
days for written report.
13.How big does a city have to be to require a water pollution control program?
- ANSWER 10,000 or greater.
,14.How long do operations and lab documents have to be retained? - ANSWER
Records 3 years. Sludge records 5 years.
15.Average percent solids in domestic wastewater? - ANSWER 99.9% water,
.1% solids.
16.During dry weather, peak flow is about _________ average flow and
minimum flow is about __________. - ANSWER twice; half
17.3 problems from excessive I & I - ANSWER 1. Loss of treatment capacity
2. Dilution of wastewater
3. Blocked lines due to sand entering collection system.
18.BOD concentration of domestic wastewater. - ANSWER 100 to 300 mg/L
19.Any plant with a design flow above _________ is required to install
instrumentation for continuous flow totalizing. - ANSWER 0.5 MGD
20.Flow velocity requirement for grit removal in a manually cleaned grit
chamber. - ANSWER About 1 foot/second.
21.Ways to achieve flow equalization - ANSWER Primary clarifiers, EQ
basins, storm water clarifiers, variable speed lift station pumps, and large lift
stations with different sized pumps.
22.Flow velocity requirement for primary clarifier (sedimentation basin). -
ANSWER .01 to .03 feet per second
, 23.Primary settling should remove___ to ___ settleable solids. - ANSWER 90
to 95%
24.Primary settling should remove ___ to ___ suspended solids. - ANSWER 50
to 70%
25.Primary settling should remove ___ to ___ BOD. - ANSWER 30 to 40%
26.Primary settling should remove ___ to ___ of total organic matter. -
ANSWER 20 to 30%
27.What type of sludge has a non-uniform, lumpy texture, gray to black in
color. Musty, fecal odor. Average pH 6.8. - ANSWER Raw or primary
sludge.
28.In an activated sludge treatment system, primary treatment processes include
the: - ANSWER Primary Clarifiers
29.In a washing grit remover, the grit is moved slowly by screw conveyors up
an inclined channel in order to? - ANSWER Removal of Inorganic material
from grit
30.An efficient primary clarifier is expected to remove ? of the influent
settleable solids. - ANSWER 90% or above
31.Proper operation of a facultative pond system requires that:, - ANSWER
Adequate DO at surface at all times
STUDY GUIDE 2026/2027 COMPLETE
QUESTIONS WITH CORRECT DETAILED
ANSWERS || 100% GUARANTEED PASS
<RECENT VERSION>
1. The name of the State Agency responsible for enforcing pollution control
laws in Texas - ANSWER Texas Commission of Environmental Quality
2. The term pathogenic means - ANSWER Capable of causing disease
3. The minimum separation between sewer lines and potable water lines is -
ANSWER Ideally, 9 feet. At least 2 feet above and 4 feet horizontal.
Separate trenches.
4. A licensed wastewater operator is a professional - ANSWER 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
5. An important step in testing a sample for Total Suspended Solids is -
ANSWER Filtering a sample
6. The Biochemical oxygen Demand (BOD) of a sample is based on -
ANSWER Measuring the dissolved oxygen (DO) used
,7. The results of Biochemical Oxygen Demand (BOD) sample taken at a
treatment plant tells the operator - ANSWER How the plant was operating 5
days ago
8. Which of the following are dangerous gasses that are likely to be present in
lift stations and manholes? - ANSWER Natural gas, gasoline fumes,
hydrogen sulfide and carbon monoxide
9. A preferred hydraulic method of cleaning sewer lines is - ANSWER Hydro
Jet Cleaner
10.Ways to reduce bad odors coming from a collection system - ANSWER
routinely cleaning slow running or low flow lines, adding chlorine or
hydrogen peroxide to the collection system
11.Steps to treating wastewater: - ANSWER 1. Source pretreatment
2. Collection
3. Cross-connection control
4. Preliminary treatment (screening, grit and grease removal)
5. Primary treatment
6. Secondary treatment
7. Advanced treatment (tertiary)
8. Disinfection
9. Discharge
10. Sludge treatment and disposal
12.Unauthorized discharge, overflow, bypass - ANSWER 24 hours for notice; 5
days for written report.
13.How big does a city have to be to require a water pollution control program?
- ANSWER 10,000 or greater.
,14.How long do operations and lab documents have to be retained? - ANSWER
Records 3 years. Sludge records 5 years.
15.Average percent solids in domestic wastewater? - ANSWER 99.9% water,
.1% solids.
16.During dry weather, peak flow is about _________ average flow and
minimum flow is about __________. - ANSWER twice; half
17.3 problems from excessive I & I - ANSWER 1. Loss of treatment capacity
2. Dilution of wastewater
3. Blocked lines due to sand entering collection system.
18.BOD concentration of domestic wastewater. - ANSWER 100 to 300 mg/L
19.Any plant with a design flow above _________ is required to install
instrumentation for continuous flow totalizing. - ANSWER 0.5 MGD
20.Flow velocity requirement for grit removal in a manually cleaned grit
chamber. - ANSWER About 1 foot/second.
21.Ways to achieve flow equalization - ANSWER Primary clarifiers, EQ
basins, storm water clarifiers, variable speed lift station pumps, and large lift
stations with different sized pumps.
22.Flow velocity requirement for primary clarifier (sedimentation basin). -
ANSWER .01 to .03 feet per second
, 23.Primary settling should remove___ to ___ settleable solids. - ANSWER 90
to 95%
24.Primary settling should remove ___ to ___ suspended solids. - ANSWER 50
to 70%
25.Primary settling should remove ___ to ___ BOD. - ANSWER 30 to 40%
26.Primary settling should remove ___ to ___ of total organic matter. -
ANSWER 20 to 30%
27.What type of sludge has a non-uniform, lumpy texture, gray to black in
color. Musty, fecal odor. Average pH 6.8. - ANSWER Raw or primary
sludge.
28.In an activated sludge treatment system, primary treatment processes include
the: - ANSWER Primary Clarifiers
29.In a washing grit remover, the grit is moved slowly by screw conveyors up
an inclined channel in order to? - ANSWER Removal of Inorganic material
from grit
30.An efficient primary clarifier is expected to remove ? of the influent
settleable solids. - ANSWER 90% or above
31.Proper operation of a facultative pond system requires that:, - ANSWER
Adequate DO at surface at all times
