TCEQ Class B Surface Water Exam 2026
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Questions & Detailed Ans
EXAM
1. When pressure testing a new line, how much pressure do you add?
1.5 times the normal operating pressure, up to 150 psi, whichever is greater .
2. What would cause a repeat Bac-T (bacteriological) sample?
All of the above: Incomplete form, not enough sample, silt or slime in the bottle, or a
positive E. coli result .
3. What are the three layers of stratification in a reservoir?
Upper layer (Epilimnion), Middle layer (Thermocline), Bottom Layer (Hypolimnion) .
4. Which two filter membranes remove the most NTU (Nephelometric Turbidity
Units)?
Reverse Osmosis (RO) and Nano Filtration .
5. What are lime and soda ash primarily used for removing from water?
Hardness (calcium and magnesium) .
6. What is a "Solid Contact Unit" (also known as a Sludge Blanket Unit)?
An all-in-one treatment unit that handles mixing, flocculation, and sedimentation in an
upward flow process .
7. What is the number one sludge removal process used in Texas?
Lagooning (or Lagoons) .
8. What are the log removal requirements for Cryptosporidium, Giardia, and
Viruses?
Cryptosporidium: Log 2 (99% removal)
Giardia: Log 3 (99.9% removal)
Viruses: Log 4 (99.99% removal)
, 9. What does the presence of di- and tri-chloramines, along with excessive free
ammonia, indicate?
That the chloramine ratio is off .
10. What is the "Right to Know" law (typically included in an MSDS)?
It requires employers to provide information, training, and PPE to workers who may be
exposed to hazardous chemicals .
11. What are the Action Levels for Lead and Copper under the Lead and Copper
Rule?
Lead: 0.015 mg/L
Copper: 1.3 mg/L
12. What is the maximum flow rate through a sand filter?
2-4 gallons per minute per square foot (GPM/ft²) .
13. What is the minimum pressure required in a distribution system?
20 pounds per square inch (psi) .
14. What safety devices are required on chlorine cylinders?
A fusible plug safety device designed to melt between 158-165 degrees Fahrenheit .
15. What are the safe chlorine withdrawal rates from a cylinder?
150 pounds per day from a 150-lb cylinder, or 1 ton per day from a ton cylinder .
16. What changes to a water system must be reported to the TCEQ?
Changes in water source, system alterations, treatment facility additions, new
construction, changes in water quality, or any water supply health hazards .
17. Where in the distribution system would you suspect high levels of Total
Trihalomethanes (TTHMs)?
The far reaches of the distribution system (areas with the longest water age) .
18. What are the MCLs (Maximum Contaminant Levels) for the primary
disinfection byproducts?
TTHM (Total Trihalomethanes): 0.080 mg/L
HAA5 (Haloacetic Acids): 0.060 mg/L
19. What is the definition of a "Community Water System"?
A public water system that supplies water to the same population year-round (at least
25 people) .
| NEWEST Test Material |100% Verified
Questions & Detailed Ans
EXAM
1. When pressure testing a new line, how much pressure do you add?
1.5 times the normal operating pressure, up to 150 psi, whichever is greater .
2. What would cause a repeat Bac-T (bacteriological) sample?
All of the above: Incomplete form, not enough sample, silt or slime in the bottle, or a
positive E. coli result .
3. What are the three layers of stratification in a reservoir?
Upper layer (Epilimnion), Middle layer (Thermocline), Bottom Layer (Hypolimnion) .
4. Which two filter membranes remove the most NTU (Nephelometric Turbidity
Units)?
Reverse Osmosis (RO) and Nano Filtration .
5. What are lime and soda ash primarily used for removing from water?
Hardness (calcium and magnesium) .
6. What is a "Solid Contact Unit" (also known as a Sludge Blanket Unit)?
An all-in-one treatment unit that handles mixing, flocculation, and sedimentation in an
upward flow process .
7. What is the number one sludge removal process used in Texas?
Lagooning (or Lagoons) .
8. What are the log removal requirements for Cryptosporidium, Giardia, and
Viruses?
Cryptosporidium: Log 2 (99% removal)
Giardia: Log 3 (99.9% removal)
Viruses: Log 4 (99.99% removal)
, 9. What does the presence of di- and tri-chloramines, along with excessive free
ammonia, indicate?
That the chloramine ratio is off .
10. What is the "Right to Know" law (typically included in an MSDS)?
It requires employers to provide information, training, and PPE to workers who may be
exposed to hazardous chemicals .
11. What are the Action Levels for Lead and Copper under the Lead and Copper
Rule?
Lead: 0.015 mg/L
Copper: 1.3 mg/L
12. What is the maximum flow rate through a sand filter?
2-4 gallons per minute per square foot (GPM/ft²) .
13. What is the minimum pressure required in a distribution system?
20 pounds per square inch (psi) .
14. What safety devices are required on chlorine cylinders?
A fusible plug safety device designed to melt between 158-165 degrees Fahrenheit .
15. What are the safe chlorine withdrawal rates from a cylinder?
150 pounds per day from a 150-lb cylinder, or 1 ton per day from a ton cylinder .
16. What changes to a water system must be reported to the TCEQ?
Changes in water source, system alterations, treatment facility additions, new
construction, changes in water quality, or any water supply health hazards .
17. Where in the distribution system would you suspect high levels of Total
Trihalomethanes (TTHMs)?
The far reaches of the distribution system (areas with the longest water age) .
18. What are the MCLs (Maximum Contaminant Levels) for the primary
disinfection byproducts?
TTHM (Total Trihalomethanes): 0.080 mg/L
HAA5 (Haloacetic Acids): 0.060 mg/L
19. What is the definition of a "Community Water System"?
A public water system that supplies water to the same population year-round (at least
25 people) .
