TCEQ Class C Water License Exam
Exam Coverage
• Water treatment fundamentals, source water characteristics, and treatment objectives.
• Coagulation, flocculation, sedimentation, filtration, and disinfection principles.
• Distribution-system operation, storage, pressure, valves, and water quality.
• Chlorine and other disinfectant concepts, dosing, residuals, and safety.
• Water chemistry, pH, alkalinity, hardness, turbidity, and basic calculations.
• Sampling, laboratory measurements, records, and regulatory compliance.
• Cross-connection, backflow prevention, contamination control, and public health.
• Operator safety, chemical handling, confined spaces, and emergency response.
• Process monitoring, troubleshooting, and corrective operational decisions.
• Preventive maintenance, documentation, and responsible operation of treatment facilities.
1. A contractor or examinee is evaluating a detailed scenario involving high turbidity entering a
conventional treatment process. Which option best reflects the correct response?
A. Increase finished-water turbidity intentionally
B. Optimize coagulation and flocculation while investigating source-water changes before
filtration
,C. Ignore the turbidity measurement
D. Bypass all treatment
Answer: B — Elevated raw-water turbidity can require adjustment of coagulation and
investigation of changing source conditions.
2. A field scenario highlights an operator handling concentrated treatment chemicals. Which
response best demonstrates competent professional reasoning and correct application of
standards?
A. Mix incompatible chemicals casually
B. Handle concentrates without protection
C. Use required PPE, chemical-specific procedures, ventilation, and emergency-response
measures
D. Store chemicals in food containers
Answer: C — Chemical handling requires controls appropriate to the material's hazards.
3. Which option best demonstrates correct application of professional knowledge when a
scenario specifically involves finished water showing an unexpected change in pH?
A. Verify the measurement and investigate treatment chemistry and source-water changes
B. Adjust chemicals immediately without testing
C. Stop all sampling
,D. Ignore the change
Answer: A — Unexpected pH changes should be confirmed and traced to process or source
conditions before corrective adjustment.
4. An examinee encounters a situation involving a chlorine chemical-feed calculation. Which
answer demonstrates the strongest understanding of the applicable requirement?
A. Use concentration without considering units
B. Ignore flow rate
C. Guess the feed rate
D. Use the appropriate flow, target dose, concentration, and unit conversions to determine feed
requirements
Answer: D — Chemical-feed calculations require consistent units and the relevant flow and
concentration relationships.
5. Considering the technical and compliance implications of a suspected cross-connection to a
potable-water supply, which option should be selected as the most appropriate?
A. Connect the systems permanently
B. Protect the potable system by identifying the connection and applying appropriate
backflow-prevention measures
C. Remove all backflow protection
, D. Ignore the connection if water appears clear
Answer: B — Cross-connections can permit contamination and require effective prevention or
control.
6. A professional is asked to resolve a problem involving daily operational records. Which
choice provides the most accurate and defensible response?
A. Estimate values from memory
B. Document process conditions, measurements, chemical use, maintenance, and unusual
events accurately
C. Delete abnormal readings
D. Record only favorable results
Answer: B — Accurate records support compliance, troubleshooting, and safe facility
operation.
7. An examinee encounters a situation involving a chlorine chemical-feed calculation. Which
answer demonstrates the strongest understanding of the applicable requirement?
A. Guess the feed rate
B. Ignore flow rate
C. Use concentration without considering units
Exam Coverage
• Water treatment fundamentals, source water characteristics, and treatment objectives.
• Coagulation, flocculation, sedimentation, filtration, and disinfection principles.
• Distribution-system operation, storage, pressure, valves, and water quality.
• Chlorine and other disinfectant concepts, dosing, residuals, and safety.
• Water chemistry, pH, alkalinity, hardness, turbidity, and basic calculations.
• Sampling, laboratory measurements, records, and regulatory compliance.
• Cross-connection, backflow prevention, contamination control, and public health.
• Operator safety, chemical handling, confined spaces, and emergency response.
• Process monitoring, troubleshooting, and corrective operational decisions.
• Preventive maintenance, documentation, and responsible operation of treatment facilities.
1. A contractor or examinee is evaluating a detailed scenario involving high turbidity entering a
conventional treatment process. Which option best reflects the correct response?
A. Increase finished-water turbidity intentionally
B. Optimize coagulation and flocculation while investigating source-water changes before
filtration
,C. Ignore the turbidity measurement
D. Bypass all treatment
Answer: B — Elevated raw-water turbidity can require adjustment of coagulation and
investigation of changing source conditions.
2. A field scenario highlights an operator handling concentrated treatment chemicals. Which
response best demonstrates competent professional reasoning and correct application of
standards?
A. Mix incompatible chemicals casually
B. Handle concentrates without protection
C. Use required PPE, chemical-specific procedures, ventilation, and emergency-response
measures
D. Store chemicals in food containers
Answer: C — Chemical handling requires controls appropriate to the material's hazards.
3. Which option best demonstrates correct application of professional knowledge when a
scenario specifically involves finished water showing an unexpected change in pH?
A. Verify the measurement and investigate treatment chemistry and source-water changes
B. Adjust chemicals immediately without testing
C. Stop all sampling
,D. Ignore the change
Answer: A — Unexpected pH changes should be confirmed and traced to process or source
conditions before corrective adjustment.
4. An examinee encounters a situation involving a chlorine chemical-feed calculation. Which
answer demonstrates the strongest understanding of the applicable requirement?
A. Use concentration without considering units
B. Ignore flow rate
C. Guess the feed rate
D. Use the appropriate flow, target dose, concentration, and unit conversions to determine feed
requirements
Answer: D — Chemical-feed calculations require consistent units and the relevant flow and
concentration relationships.
5. Considering the technical and compliance implications of a suspected cross-connection to a
potable-water supply, which option should be selected as the most appropriate?
A. Connect the systems permanently
B. Protect the potable system by identifying the connection and applying appropriate
backflow-prevention measures
C. Remove all backflow protection
, D. Ignore the connection if water appears clear
Answer: B — Cross-connections can permit contamination and require effective prevention or
control.
6. A professional is asked to resolve a problem involving daily operational records. Which
choice provides the most accurate and defensible response?
A. Estimate values from memory
B. Document process conditions, measurements, chemical use, maintenance, and unusual
events accurately
C. Delete abnormal readings
D. Record only favorable results
Answer: B — Accurate records support compliance, troubleshooting, and safe facility
operation.
7. An examinee encounters a situation involving a chlorine chemical-feed calculation. Which
answer demonstrates the strongest understanding of the applicable requirement?
A. Guess the feed rate
B. Ignore flow rate
C. Use concentration without considering units
