Certified Stormwater Inspector Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
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1. What is the primary purpose of a stormwater inspection program?
A. To increase the flow of stormwater from a site
B. To identify and correct conditions that could cause stormwater pollution
C. To eliminate all stormwater from construction sites
D. To replace permanent drainage systems
Answer: B. To identify and correct conditions that could cause stormwater pollution
Rationale: Stormwater inspections are intended to identify pollutant sources,
evaluate the effectiveness of best management practices (BMPs), document
deficiencies, and ensure that corrective actions are implemented. The goal is
pollution prevention and compliance, not simply increasing drainage capacity.
2. Which pollutant is most commonly associated with soil erosion from
construction sites?
A. Sediment
B. Chlorine gas
C. Ozone
D. Dissolved oxygen
Answer: A. Sediment
Rationale: Construction activities disturb soil, making sediment one of the most
common stormwater pollutants. Sediment can enter drainage systems and surface
,waters, increasing turbidity, degrading aquatic habitat, and transporting attached
nutrients and other pollutants.
3. What is the first step an inspector should generally take when beginning a site
inspection?
A. Remove all BMPs
B. Review available site plans, permits, and previous inspection records
C. Immediately collect water samples
D. Begin repairing damaged controls
Answer: B. Review available site plans, permits, and previous inspection records
Rationale: Reviewing the approved plans, permit conditions, previous deficiencies,
and site history gives the inspector the context needed to perform an effective
inspection. The inspector can then compare actual conditions with required
practices.
4. What does BMP stand for in stormwater management?
A. Basic Monitoring Procedure
B. Best Management Practice
C. Biological Management Process
D. Basin Maintenance Program
Answer: B. Best Management Practice
Rationale: Best Management Practices are structural or nonstructural measures
used to prevent, reduce, or control pollutants in stormwater runoff. Examples
include silt fence, sediment basins, stabilized entrances, inlet protection, and good
housekeeping.
5. Which condition most directly increases the potential for construction-site
erosion?
,A. Stable vegetation
B. Exposed and disturbed soil
C. Properly installed erosion controls
D. Completed pavement
Answer: B. Exposed and disturbed soil
Rationale: Disturbed soil lacks the protective cover provided by vegetation or other
stabilization measures. Rainfall and runoff can detach and transport exposed soil,
increasing erosion and sediment discharge.
6. What is the primary difference between erosion and sedimentation?
A. Erosion removes soil; sedimentation deposits transported soil
B. Erosion deposits soil; sedimentation removes soil
C. They are identical processes
D. Erosion only occurs underground
Answer: A. Erosion removes soil; sedimentation deposits transported soil
Rationale: Erosion is the detachment and movement of soil by water, wind, or other
forces. Sedimentation occurs when transported particles settle out of runoff or
another moving fluid.
7. Which of the following is an example of a nonstructural stormwater BMP?
A. Sediment basin
B. Check dam
C. Employee training
D. Concrete-lined channel
Answer: C. Employee training
Rationale: Nonstructural BMPs rely on management practices rather than physical
structures. Training, good housekeeping, scheduling, inspections, spill prevention,
and minimizing disturbed areas are common examples.
, 8. What is the primary function of a silt fence?
A. Completely stop all runoff
B. Filter and slow shallow sheet flow and retain sediment
C. Pump groundwater from an excavation
D. Replace a sediment basin on every site
Answer: B. Filter and slow shallow sheet flow and retain sediment
Rationale: Silt fence is designed primarily to intercept sheet flow from small
drainage areas and promote sediment deposition. It is not intended to withstand
concentrated flows or function as a substitute for properly designed sediment
basins.
9. Why should silt fence generally be installed along the contour rather than
directly down a slope?
A. To increase concentrated flow
B. To intercept sheet flow and encourage sediment deposition
C. To prevent vegetation growth
D. To make excavation easier
Answer: B. To intercept sheet flow and encourage sediment deposition
Rationale: A properly installed silt fence follows the terrain so runoff approaches the
barrier as shallow sheet flow. Installing it directly down a slope can concentrate
water and cause bypassing, overtopping, or failure.
10. What is a common sign that a silt fence requires maintenance?
A. Sediment has accumulated against the fence to an excessive level
B. The fence is properly tensioned
C. The fence is securely anchored
D. Vegetation is growing near the fence
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a stormwater inspection program?
A. To increase the flow of stormwater from a site
B. To identify and correct conditions that could cause stormwater pollution
C. To eliminate all stormwater from construction sites
D. To replace permanent drainage systems
Answer: B. To identify and correct conditions that could cause stormwater pollution
Rationale: Stormwater inspections are intended to identify pollutant sources,
evaluate the effectiveness of best management practices (BMPs), document
deficiencies, and ensure that corrective actions are implemented. The goal is
pollution prevention and compliance, not simply increasing drainage capacity.
2. Which pollutant is most commonly associated with soil erosion from
construction sites?
A. Sediment
B. Chlorine gas
C. Ozone
D. Dissolved oxygen
Answer: A. Sediment
Rationale: Construction activities disturb soil, making sediment one of the most
common stormwater pollutants. Sediment can enter drainage systems and surface
,waters, increasing turbidity, degrading aquatic habitat, and transporting attached
nutrients and other pollutants.
3. What is the first step an inspector should generally take when beginning a site
inspection?
A. Remove all BMPs
B. Review available site plans, permits, and previous inspection records
C. Immediately collect water samples
D. Begin repairing damaged controls
Answer: B. Review available site plans, permits, and previous inspection records
Rationale: Reviewing the approved plans, permit conditions, previous deficiencies,
and site history gives the inspector the context needed to perform an effective
inspection. The inspector can then compare actual conditions with required
practices.
4. What does BMP stand for in stormwater management?
A. Basic Monitoring Procedure
B. Best Management Practice
C. Biological Management Process
D. Basin Maintenance Program
Answer: B. Best Management Practice
Rationale: Best Management Practices are structural or nonstructural measures
used to prevent, reduce, or control pollutants in stormwater runoff. Examples
include silt fence, sediment basins, stabilized entrances, inlet protection, and good
housekeeping.
5. Which condition most directly increases the potential for construction-site
erosion?
,A. Stable vegetation
B. Exposed and disturbed soil
C. Properly installed erosion controls
D. Completed pavement
Answer: B. Exposed and disturbed soil
Rationale: Disturbed soil lacks the protective cover provided by vegetation or other
stabilization measures. Rainfall and runoff can detach and transport exposed soil,
increasing erosion and sediment discharge.
6. What is the primary difference between erosion and sedimentation?
A. Erosion removes soil; sedimentation deposits transported soil
B. Erosion deposits soil; sedimentation removes soil
C. They are identical processes
D. Erosion only occurs underground
Answer: A. Erosion removes soil; sedimentation deposits transported soil
Rationale: Erosion is the detachment and movement of soil by water, wind, or other
forces. Sedimentation occurs when transported particles settle out of runoff or
another moving fluid.
7. Which of the following is an example of a nonstructural stormwater BMP?
A. Sediment basin
B. Check dam
C. Employee training
D. Concrete-lined channel
Answer: C. Employee training
Rationale: Nonstructural BMPs rely on management practices rather than physical
structures. Training, good housekeeping, scheduling, inspections, spill prevention,
and minimizing disturbed areas are common examples.
, 8. What is the primary function of a silt fence?
A. Completely stop all runoff
B. Filter and slow shallow sheet flow and retain sediment
C. Pump groundwater from an excavation
D. Replace a sediment basin on every site
Answer: B. Filter and slow shallow sheet flow and retain sediment
Rationale: Silt fence is designed primarily to intercept sheet flow from small
drainage areas and promote sediment deposition. It is not intended to withstand
concentrated flows or function as a substitute for properly designed sediment
basins.
9. Why should silt fence generally be installed along the contour rather than
directly down a slope?
A. To increase concentrated flow
B. To intercept sheet flow and encourage sediment deposition
C. To prevent vegetation growth
D. To make excavation easier
Answer: B. To intercept sheet flow and encourage sediment deposition
Rationale: A properly installed silt fence follows the terrain so runoff approaches the
barrier as shallow sheet flow. Installing it directly down a slope can concentrate
water and cause bypassing, overtopping, or failure.
10. What is a common sign that a silt fence requires maintenance?
A. Sediment has accumulated against the fence to an excessive level
B. The fence is properly tensioned
C. The fence is securely anchored
D. Vegetation is growing near the fence
