Texas Wastewater Class A (Test 3) questions
and answers 2025\2026 A+ Grade
What removes Total Suspended Solids from a sample (TSS)
- correct answer filtration
What chapter of the Texas Water Code gives T C E Q authority to control discharges in Texas.
- correct answer Chapter 26
Inorganic solids include
- correct answer sand, grit and minerals
Organic solids include
- correct answer organic materials from plants, animals or humans
A good plant influent pH is about
- correct answer 7.2
A simple method for indicating when to waste sludge is
- correct answer 30 minute settling test
What is the expected organic loading of a stabilization pond and what is the detention time in days?
- correct answer 35 pounds, of B O D, per acre, per day, and a detention time of 30 Days
Calcium Hypochlorite or HTH, is a
- correct answer strong Oxidizer and reacts violently with oil and hydro carbons.
,When added to water what does chlorine form
- correct answer it forms Hypochlorite, and Hydrochloric acid
When ammonia is present in wastewater and
reacts with chlorine what is formed
- correct answer When ammonia is present in wastewater, and
reacts with chlorine, Chloramines are formed.
Besides disinfection, chlorine has other uses
at the wastewater treatment plant such as
- correct answer Reduces BOD, Odor, Algae growth, Helps with Grease
TCEQ allows the reuse of wastewater, some of these include
- correct answer Irrigation, aquifer recharge, cooling towers and fire protection
All reclaimed water piping must be the color
- correct answer purple
When a municipal wastewater effluent has a high nitrate
level, and low ammonia level, this most likely means
- correct answer a high degree of aerobic treatment
Total solids in wastewater are the sum of
- correct answer Settleable and volatile solids
This treatment device is commonly used to separate,
and remove large solids from raw wastewater
- correct answer A Mechanically raked bar screen
This test would give the best information
on how efficiently a trickling filter was operating
- correct answer Percent BOD Removal
, This trickling filter problem could be
reduced by increasing the re-circulation ratio
- correct answer Filter files
The minimum size for a gravity flow sewer line on
city right-of-way and the minimum grade is
- correct answer 6 inch and a grade of .50 percent
The most accurate way to find the average wastewater
flow rate in an existing 10-inch sewer main is
- correct answer Obtaining actual flow data & verifying with field data
What is the greatest advantage for using fiberglass
manholes in areas with high groundwater?
- correct answer fiberglass is not subject to infiltration
Excessive power consumption by a pump could be caused by
- correct answer Worn bearings and worn impeller
In an excavation, if a ladder is used as a means of exit, it must
extend how far above ground, and how far apart
laterally
- correct answer 3 feet / 25 feet laterally
the best to determine if a
storm drain is connected to a sanitary sewer line is a
- correct answer Smoke Test
What is commonly used to seal
joint leaks, on a main with minimal interruption
- correct answer internal grouting
and answers 2025\2026 A+ Grade
What removes Total Suspended Solids from a sample (TSS)
- correct answer filtration
What chapter of the Texas Water Code gives T C E Q authority to control discharges in Texas.
- correct answer Chapter 26
Inorganic solids include
- correct answer sand, grit and minerals
Organic solids include
- correct answer organic materials from plants, animals or humans
A good plant influent pH is about
- correct answer 7.2
A simple method for indicating when to waste sludge is
- correct answer 30 minute settling test
What is the expected organic loading of a stabilization pond and what is the detention time in days?
- correct answer 35 pounds, of B O D, per acre, per day, and a detention time of 30 Days
Calcium Hypochlorite or HTH, is a
- correct answer strong Oxidizer and reacts violently with oil and hydro carbons.
,When added to water what does chlorine form
- correct answer it forms Hypochlorite, and Hydrochloric acid
When ammonia is present in wastewater and
reacts with chlorine what is formed
- correct answer When ammonia is present in wastewater, and
reacts with chlorine, Chloramines are formed.
Besides disinfection, chlorine has other uses
at the wastewater treatment plant such as
- correct answer Reduces BOD, Odor, Algae growth, Helps with Grease
TCEQ allows the reuse of wastewater, some of these include
- correct answer Irrigation, aquifer recharge, cooling towers and fire protection
All reclaimed water piping must be the color
- correct answer purple
When a municipal wastewater effluent has a high nitrate
level, and low ammonia level, this most likely means
- correct answer a high degree of aerobic treatment
Total solids in wastewater are the sum of
- correct answer Settleable and volatile solids
This treatment device is commonly used to separate,
and remove large solids from raw wastewater
- correct answer A Mechanically raked bar screen
This test would give the best information
on how efficiently a trickling filter was operating
- correct answer Percent BOD Removal
, This trickling filter problem could be
reduced by increasing the re-circulation ratio
- correct answer Filter files
The minimum size for a gravity flow sewer line on
city right-of-way and the minimum grade is
- correct answer 6 inch and a grade of .50 percent
The most accurate way to find the average wastewater
flow rate in an existing 10-inch sewer main is
- correct answer Obtaining actual flow data & verifying with field data
What is the greatest advantage for using fiberglass
manholes in areas with high groundwater?
- correct answer fiberglass is not subject to infiltration
Excessive power consumption by a pump could be caused by
- correct answer Worn bearings and worn impeller
In an excavation, if a ladder is used as a means of exit, it must
extend how far above ground, and how far apart
laterally
- correct answer 3 feet / 25 feet laterally
the best to determine if a
storm drain is connected to a sanitary sewer line is a
- correct answer Smoke Test
What is commonly used to seal
joint leaks, on a main with minimal interruption
- correct answer internal grouting
