TCEQ Wastewater License Exam (2025)
comprehensive questions and verified
detailed solutions
Environment --> Water Treatment --> Water Distribution System --> Customer
📌📌
Use --> Wastewater Collection System --> Wastewater Treatment -->
Environment - - What are the steps of the Water Use Cycle?
- Removal of health hazards
- Prevention of odors and flies
📌📌- What are the benefits of the collection
- Cleanliness and appearance
- Comfort and convenience -
system?
Septic wastewater doesn't contain dissolved oxygen and is difficult to treat. Fresh
📌📌
wastewater contains dissolved oxygen and is easier to treat, which results in
higher quality effluent - - Septic vs. Fresh wastewater?
Surface runoff that enters the collection system - 📌📌- Inflow
📌📌
Groundwater that enters the collection system through holes, cracks, etc. -
- Infiltration
100 gallons per day - 📌📌 - What is the average domestic contribution to the
collection system? (Per person/day)
Physical, Chemical, Bacteriological, and Radiological - 📌📌- What are the four
wastewater characteristics?
99.9% water, 0.1% solids - 📌📌- Domestic wastewater is ___% water and
___% solids
📌📌
Suspended solids that will settle when wastewater flow is still or slow moving -
- Settleable solids
0 (most acidic) to 14 (most basic), 7 is neutral - 📌📌- What is the pH scale
range?
📌📌
Septic has lower pH due to volatile acids formed from wastewater decomposition
- - Does septic or freshwater have a lower pH? Why?
A colorless, toxic, and flammable gas that resembles the smell of rotten eggs. It
results from the bacterial breakdown of organic matter in the absence of oxygen.
, or operating equipment. - 📌📌- What is Methane? (CH4) What percentage of
methane is in digester gas?
A colorless, odorless gas that has a suffocating effect. When inhaled at higher
📌📌
than normal concentrations, it can produce a sour taste in the mouth and a
stinging sensation in the nose and throat. - - What is carbon dioxide? (CO2)
A colorless, odorless, and tasteless gas - 📌📌- What is carbon monoxide? (CO)
It may cause explosions, fires, line blockages, and odor - 📌📌- Why is oil and
grease a concern if present in wastewater?
📌📌
Excessive chlorides interfere with treatment processes, especially trickling filters.
They also affect laboratory tests. - - What are chlorides and why are
excessive chlorides in wastewater bad?
It measures wastewater strength and the oxygen depleting effect of wastewater
effluent on the receiving stream. Specifically, it indicates the amount of organic
📌📌
matter that can be oxidized by biological and chemical action in five days at 20
degrees Celsius. - - What does the BOD test measure?
Polio and infectious hepatitis -📌📌 - What are pathogens? What are two viral
diseases that could be carried in wastewater?
- Wear cut-resistant gloves
- Wash after contacting wastewater
- Do not eat or smoke around wastewater
- Disinfect equipment with bleach
- Well-maintained water system
📌📌
- Sanitary collection system
- Well-operated wastewater treatment plant - - What are precautions
individuals can take to protect against pathogens in the collection system? How
do communities overall prevent waterborne disease?
- Dispose of solids
- Destroy pathogens
📌📌- What is the purpose of wastewater
- Eliminate nuisances
- Protect downstream users -
treatment?
The Texas Water Code - 📌📌- What is the state *law* regulating water pollution
control in Texas?
The Texas Commission on Environmental Quality (TCEQ) - 📌📌- Who is the
comprehensive questions and verified
detailed solutions
Environment --> Water Treatment --> Water Distribution System --> Customer
📌📌
Use --> Wastewater Collection System --> Wastewater Treatment -->
Environment - - What are the steps of the Water Use Cycle?
- Removal of health hazards
- Prevention of odors and flies
📌📌- What are the benefits of the collection
- Cleanliness and appearance
- Comfort and convenience -
system?
Septic wastewater doesn't contain dissolved oxygen and is difficult to treat. Fresh
📌📌
wastewater contains dissolved oxygen and is easier to treat, which results in
higher quality effluent - - Septic vs. Fresh wastewater?
Surface runoff that enters the collection system - 📌📌- Inflow
📌📌
Groundwater that enters the collection system through holes, cracks, etc. -
- Infiltration
100 gallons per day - 📌📌 - What is the average domestic contribution to the
collection system? (Per person/day)
Physical, Chemical, Bacteriological, and Radiological - 📌📌- What are the four
wastewater characteristics?
99.9% water, 0.1% solids - 📌📌- Domestic wastewater is ___% water and
___% solids
📌📌
Suspended solids that will settle when wastewater flow is still or slow moving -
- Settleable solids
0 (most acidic) to 14 (most basic), 7 is neutral - 📌📌- What is the pH scale
range?
📌📌
Septic has lower pH due to volatile acids formed from wastewater decomposition
- - Does septic or freshwater have a lower pH? Why?
A colorless, toxic, and flammable gas that resembles the smell of rotten eggs. It
results from the bacterial breakdown of organic matter in the absence of oxygen.
, or operating equipment. - 📌📌- What is Methane? (CH4) What percentage of
methane is in digester gas?
A colorless, odorless gas that has a suffocating effect. When inhaled at higher
📌📌
than normal concentrations, it can produce a sour taste in the mouth and a
stinging sensation in the nose and throat. - - What is carbon dioxide? (CO2)
A colorless, odorless, and tasteless gas - 📌📌- What is carbon monoxide? (CO)
It may cause explosions, fires, line blockages, and odor - 📌📌- Why is oil and
grease a concern if present in wastewater?
📌📌
Excessive chlorides interfere with treatment processes, especially trickling filters.
They also affect laboratory tests. - - What are chlorides and why are
excessive chlorides in wastewater bad?
It measures wastewater strength and the oxygen depleting effect of wastewater
effluent on the receiving stream. Specifically, it indicates the amount of organic
📌📌
matter that can be oxidized by biological and chemical action in five days at 20
degrees Celsius. - - What does the BOD test measure?
Polio and infectious hepatitis -📌📌 - What are pathogens? What are two viral
diseases that could be carried in wastewater?
- Wear cut-resistant gloves
- Wash after contacting wastewater
- Do not eat or smoke around wastewater
- Disinfect equipment with bleach
- Well-maintained water system
📌📌
- Sanitary collection system
- Well-operated wastewater treatment plant - - What are precautions
individuals can take to protect against pathogens in the collection system? How
do communities overall prevent waterborne disease?
- Dispose of solids
- Destroy pathogens
📌📌- What is the purpose of wastewater
- Eliminate nuisances
- Protect downstream users -
treatment?
The Texas Water Code - 📌📌- What is the state *law* regulating water pollution
control in Texas?
The Texas Commission on Environmental Quality (TCEQ) - 📌📌- Who is the
