TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
TEXAS WASTEWATER CLASS A 2026 EXAM |
VERIFIED CURRENTLY TESTING QUESTIONS
WITH COMPLETE ANSWERS
Seeding of BOD samples is necessary when samples
(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?
Summer
A 30-inch diameter wastewater interceptor is observed to be flowing half-full at about two fps. The
approximate volume of wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 =
2,200 gpm
c. 2,200 gallons per minute
A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5-inch stroke pumps at a rate of 50
cycles per minute. How many minutes must the pump be operated to pump 5,000 gallons of sludge?
3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min 84.5 gpm b. 29
60 minutes
8/29/2026
If an existing centrifugal pump motor is replaced with a motor with 25 percent more speed, the motor
horsepower required will increase by 1.25 x 1.25 x 1.25 = 1.95
1
, TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
95 percent
When must TCEQ be notified about expansions of a treatment facility?
Before construction
In an anaerobic digester, the percentage of methane and carbon dioxide gas content should be
70% methane, 30% carbon dioxide
The temperature of an anaerobic digester should be maintained at a minimum of
95° F
What type of wastewater treatment operates in the endogenous bacteria growth phase?
Extended air
Why is recirculation needed in a trickling filter?
Keep the media wet Further reduce BOD All of the above (a, b, and c)
What type of fire extinguisher would be used on an electrical control panel that has been de-energized?
Class A Class C (a and d)
8/29/2026
Disinfection with chlorine is the most effective at a pH of
2
, TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
6.0
The biomass on a normal functioning RBC has what appearance?
Grey to brown and 0.05 to 0.1 inch thick
The sludge from a primary clarifier should percent solids?
4% to 6%
What is eutrophication in a pond system?
Enrichment with nitrogen and phosphorous Causes algae blooms (b and c)
How often should pH meters be calibrated?
Daily
In Texas, pH meters are required to be calibrated on how many buffers?
two
An industrial complex has a BOD discharge to the POTW of 500 pounds per day. The population
equivalent of this industry is 500 lbs = 2,941 0.17 lbs BOD person
2941
8/29/2026
3
, TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
The parameters of the BOD test are
5 days at 20° Centigrade
Standard Dimension Ratio in pvc pipe is defined as
Ratio of OD pipe diameter to wall thickness
How should shoring be removed from a trench?
up from the bottom up
In low pressure sewer systems where each tap must have a grinder pump lift station, station is
considered to be
part of the collection system and the responsibility of the utility
Effective communication depends on
being a good listener
When designing a wastewater collection system, the engineer considers the population for how many
years in the future?
50
8/29/2026
According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure shall have a
minimum psi pressure rating of
4
TEXAS WASTEWATER CLASS A 2026 EXAM |
VERIFIED CURRENTLY TESTING QUESTIONS
WITH COMPLETE ANSWERS
Seeding of BOD samples is necessary when samples
(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?
Summer
A 30-inch diameter wastewater interceptor is observed to be flowing half-full at about two fps. The
approximate volume of wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 =
2,200 gpm
c. 2,200 gallons per minute
A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5-inch stroke pumps at a rate of 50
cycles per minute. How many minutes must the pump be operated to pump 5,000 gallons of sludge?
3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min 84.5 gpm b. 29
60 minutes
8/29/2026
If an existing centrifugal pump motor is replaced with a motor with 25 percent more speed, the motor
horsepower required will increase by 1.25 x 1.25 x 1.25 = 1.95
1
, TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
95 percent
When must TCEQ be notified about expansions of a treatment facility?
Before construction
In an anaerobic digester, the percentage of methane and carbon dioxide gas content should be
70% methane, 30% carbon dioxide
The temperature of an anaerobic digester should be maintained at a minimum of
95° F
What type of wastewater treatment operates in the endogenous bacteria growth phase?
Extended air
Why is recirculation needed in a trickling filter?
Keep the media wet Further reduce BOD All of the above (a, b, and c)
What type of fire extinguisher would be used on an electrical control panel that has been de-energized?
Class A Class C (a and d)
8/29/2026
Disinfection with chlorine is the most effective at a pH of
2
, TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
6.0
The biomass on a normal functioning RBC has what appearance?
Grey to brown and 0.05 to 0.1 inch thick
The sludge from a primary clarifier should percent solids?
4% to 6%
What is eutrophication in a pond system?
Enrichment with nitrogen and phosphorous Causes algae blooms (b and c)
How often should pH meters be calibrated?
Daily
In Texas, pH meters are required to be calibrated on how many buffers?
two
An industrial complex has a BOD discharge to the POTW of 500 pounds per day. The population
equivalent of this industry is 500 lbs = 2,941 0.17 lbs BOD person
2941
8/29/2026
3
, TEXAS WASTEWATER CLASS A 2026 EXAM 08/29/2026
The parameters of the BOD test are
5 days at 20° Centigrade
Standard Dimension Ratio in pvc pipe is defined as
Ratio of OD pipe diameter to wall thickness
How should shoring be removed from a trench?
up from the bottom up
In low pressure sewer systems where each tap must have a grinder pump lift station, station is
considered to be
part of the collection system and the responsibility of the utility
Effective communication depends on
being a good listener
When designing a wastewater collection system, the engineer considers the population for how many
years in the future?
50
8/29/2026
According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure shall have a
minimum psi pressure rating of
4
