1|Page
TEXAS WASTEWATER CLASS A Exam |
Comprehensive Q&A For Certification Success
2025/2026
Seeding of BOD samples is necessary when samples -correct-answer-(All of the
above) have a chlorine residual, have a previously been chlorinated, have been
subjected to high temperatures, contain high or low pH industrial wastes
When is blue-green algae the most dominant on a pond treatment system? -
correct-answer-Summer
Before making major changes in the collection system or the treatment plant,
detailed designed by a professional engineer must be submitted to TCEQ before -
correct-answer-beginning construction
When connecting a public water supply to any source of potential contamination,
an air gap of what size must be provided? -correct-answer-two times the inlet pipe
diameter
,2|Page
The most important purpose for wastewater treatment is -correct-answer-to
remove harmful contaminants from the wastewater before it is discharged to the
waters of the state
Septic wastewater has what properties? -correct-answer-a. dark in color b.
offensive odor e. Jacks dissolved oxygen d. is harder treat than fresh wastewater
e. all of the above
One of the requirements of the Texas Hazard Communication Act of 1985 is that
the employer must hold annual training in which the utilities' written policies and
the employee's rights are explained to -correct-answer-all employees
The Federal Clean Water Act -correct-answer-requires a permit for disposal of
sludge requires a permit for ocean discharges of sewer c. requires a permit for
disposal or placement of dredge material creates a national permit system for all
wastewater discharge
Pretreatment of industrial waste will help minimize -correct-answer-sludge
contamination interference to the treatment process safety hazards to workers
discharge of industrial pollutants in the effluent
,3|Page
If an employee is guilty of misconduct as defined by the utilities personnel
policies, the supervisor should -correct-answer-attempt to modify the employee's
behavior through training and other forms of assistance inform the employee of
the consequences if the behavior is not modified
When fighting an electrical fire, you should -correct-answer-Use non-conductive
extinguishing methods c. Use Class A or B extinguishers if electricity to the unit
has been shut-off d. Either b or e
A particular construction project has a total of 3,000 feet of 12-inch pipe, 15
manholes, 50 wastewater connections. Based upon the contract unit costs shown,
if the contractor has completed 2,000 feet of pipe, 12 manholes, and 30
wastewater connections, what percentage of the total project has been
completed?
12 inch pipe place $85.00 per linear foot
Manholes in place $1,500.00 each
Wastewater connections $250.00 each -correct-answer-3000 x 85 = 255,000
15 x1500 = 22,500
50x 250 = 12,500
255,000 + 22,500+ 12,500 = $290,000
2000 x 85 = 170,000
12x1500 - 18,000
30x250 =7,500
, 4|Page
170,000 + 18,000 + 7,500 = S195,500
195,000/290000 =0.67 = 67%
If the float that turns on the lead pump in a wastewater lift station is situated
above a gravity influent line, the line will -correct-answer-tend to have a grease
problem
If an operations company ceases its operation or is sold such that control of the
company is transferred to another party, -correct-answer-the company's
operations certificate is revoked
In 2.5 minutes, a lift station will fill up 18" with no pumps running. In 3.25
minutes, both pumps will drop the level in the lift station 18". In 7 minutes, the
large pump will drop the level 18". What is the capacity of the small pump? The
lift station is 10' x 10 x 10'.
10x10x1.5x7.48=1122
1122 gal/2.5=449 gpm inflow
Both
1122/3.25=345 gpm + 449 gpm = 794 gpm both
TEXAS WASTEWATER CLASS A Exam |
Comprehensive Q&A For Certification Success
2025/2026
Seeding of BOD samples is necessary when samples -correct-answer-(All of the
above) have a chlorine residual, have a previously been chlorinated, have been
subjected to high temperatures, contain high or low pH industrial wastes
When is blue-green algae the most dominant on a pond treatment system? -
correct-answer-Summer
Before making major changes in the collection system or the treatment plant,
detailed designed by a professional engineer must be submitted to TCEQ before -
correct-answer-beginning construction
When connecting a public water supply to any source of potential contamination,
an air gap of what size must be provided? -correct-answer-two times the inlet pipe
diameter
,2|Page
The most important purpose for wastewater treatment is -correct-answer-to
remove harmful contaminants from the wastewater before it is discharged to the
waters of the state
Septic wastewater has what properties? -correct-answer-a. dark in color b.
offensive odor e. Jacks dissolved oxygen d. is harder treat than fresh wastewater
e. all of the above
One of the requirements of the Texas Hazard Communication Act of 1985 is that
the employer must hold annual training in which the utilities' written policies and
the employee's rights are explained to -correct-answer-all employees
The Federal Clean Water Act -correct-answer-requires a permit for disposal of
sludge requires a permit for ocean discharges of sewer c. requires a permit for
disposal or placement of dredge material creates a national permit system for all
wastewater discharge
Pretreatment of industrial waste will help minimize -correct-answer-sludge
contamination interference to the treatment process safety hazards to workers
discharge of industrial pollutants in the effluent
,3|Page
If an employee is guilty of misconduct as defined by the utilities personnel
policies, the supervisor should -correct-answer-attempt to modify the employee's
behavior through training and other forms of assistance inform the employee of
the consequences if the behavior is not modified
When fighting an electrical fire, you should -correct-answer-Use non-conductive
extinguishing methods c. Use Class A or B extinguishers if electricity to the unit
has been shut-off d. Either b or e
A particular construction project has a total of 3,000 feet of 12-inch pipe, 15
manholes, 50 wastewater connections. Based upon the contract unit costs shown,
if the contractor has completed 2,000 feet of pipe, 12 manholes, and 30
wastewater connections, what percentage of the total project has been
completed?
12 inch pipe place $85.00 per linear foot
Manholes in place $1,500.00 each
Wastewater connections $250.00 each -correct-answer-3000 x 85 = 255,000
15 x1500 = 22,500
50x 250 = 12,500
255,000 + 22,500+ 12,500 = $290,000
2000 x 85 = 170,000
12x1500 - 18,000
30x250 =7,500
, 4|Page
170,000 + 18,000 + 7,500 = S195,500
195,000/290000 =0.67 = 67%
If the float that turns on the lead pump in a wastewater lift station is situated
above a gravity influent line, the line will -correct-answer-tend to have a grease
problem
If an operations company ceases its operation or is sold such that control of the
company is transferred to another party, -correct-answer-the company's
operations certificate is revoked
In 2.5 minutes, a lift station will fill up 18" with no pumps running. In 3.25
minutes, both pumps will drop the level in the lift station 18". In 7 minutes, the
large pump will drop the level 18". What is the capacity of the small pump? The
lift station is 10' x 10 x 10'.
10x10x1.5x7.48=1122
1122 gal/2.5=449 gpm inflow
Both
1122/3.25=345 gpm + 449 gpm = 794 gpm both
