Texas Wastewater Class A Exam 2026 Full
Practice Questions and Detailed Rationales
Latest Update
‣ What chapter of the Texas Water Code gives T C E Q authority to
control discharges in Texas. . Answer: Chapter 26
‣ Inorganic solids include . Answer: sand, grit and minerals
‣ Organic solids include . Answer: organic materials from plants,
animals or humans
‣ A good plant influent pH is about . Answer: 7.2
‣ A simple method for indicating when to waste sludge is . Answer: 30
minute settling test
‣ What is the expected organic loading of a stabilization pond and what
is the detention time in days? . Answer: 35 pounds, of B O D, per acre,
per day, and a detention time of 30 Days
‣ Calcium Hypochlorite or HTH, is a . Answer: strong Oxidizer and
reacts violently with oil and hydro carbons.
,‣ When added to water what does chlorine form . Answer: it forms
Hypochlorite, and Hydrochloric acid
‣ When ammonia is present in wastewater and
reacts with chlorine what is formed . 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 . Answer: Reduces BOD,
Odor, Algae growth, Helps with Grease
‣ TCEQ allows the reuse of wastewater, some of these include . Answer:
Irrigation, aquifer recharge, cooling towers and fire protection
‣ All reclaimed water piping must be the color . Answer: purple
‣ When a municipal wastewater effluent has a high nitrate
level, and low ammonia level, this most likely means . Answer: a high
degree of aerobic treatment
‣ Total solids in wastewater are the sum of . Answer: Settleable and
volatile solids
‣ This treatment device is commonly used to separate,
, and remove large solids from raw wastewater . Answer: A Mechanically
raked bar screen
‣ This test would give the best information
on how efficiently a trickling filter was operating . Answer: Percent
BOD Removal
‣ This trickling filter problem could be
reduced by increasing the re-circulation ratio . Answer: Filter files
‣ The minimum size for a gravity flow sewer line on
city right-of-way and the minimum grade is . 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 . Answer: Obtaining
actual flow data & verifying with field data
‣ What is the greatest advantage for using fiberglass
manholes in areas with high groundwater? . Answer: fiberglass is not
subject to infiltration
‣ Excessive power consumption by a pump could be caused by .
Answer: Worn bearings and worn impeller
Practice Questions and Detailed Rationales
Latest Update
‣ What chapter of the Texas Water Code gives T C E Q authority to
control discharges in Texas. . Answer: Chapter 26
‣ Inorganic solids include . Answer: sand, grit and minerals
‣ Organic solids include . Answer: organic materials from plants,
animals or humans
‣ A good plant influent pH is about . Answer: 7.2
‣ A simple method for indicating when to waste sludge is . Answer: 30
minute settling test
‣ What is the expected organic loading of a stabilization pond and what
is the detention time in days? . Answer: 35 pounds, of B O D, per acre,
per day, and a detention time of 30 Days
‣ Calcium Hypochlorite or HTH, is a . Answer: strong Oxidizer and
reacts violently with oil and hydro carbons.
,‣ When added to water what does chlorine form . Answer: it forms
Hypochlorite, and Hydrochloric acid
‣ When ammonia is present in wastewater and
reacts with chlorine what is formed . 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 . Answer: Reduces BOD,
Odor, Algae growth, Helps with Grease
‣ TCEQ allows the reuse of wastewater, some of these include . Answer:
Irrigation, aquifer recharge, cooling towers and fire protection
‣ All reclaimed water piping must be the color . Answer: purple
‣ When a municipal wastewater effluent has a high nitrate
level, and low ammonia level, this most likely means . Answer: a high
degree of aerobic treatment
‣ Total solids in wastewater are the sum of . Answer: Settleable and
volatile solids
‣ This treatment device is commonly used to separate,
, and remove large solids from raw wastewater . Answer: A Mechanically
raked bar screen
‣ This test would give the best information
on how efficiently a trickling filter was operating . Answer: Percent
BOD Removal
‣ This trickling filter problem could be
reduced by increasing the re-circulation ratio . Answer: Filter files
‣ The minimum size for a gravity flow sewer line on
city right-of-way and the minimum grade is . 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 . Answer: Obtaining
actual flow data & verifying with field data
‣ What is the greatest advantage for using fiberglass
manholes in areas with high groundwater? . Answer: fiberglass is not
subject to infiltration
‣ Excessive power consumption by a pump could be caused by .
Answer: Worn bearings and worn impeller
