Certified Stormwater Inspector Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a stormwater management
system?
A. To treat drinking water
B. To prevent flooding and manage runoff
C. To supply irrigation water
D. To generate electricity
Answer: B
Rationale: Stormwater systems are designed to control runoff,
reduce flooding, and minimize pollution entering water bodies.
2. What does BMP stand for in stormwater management?
A. Best Maintenance Practice
B. Basic Monitoring Procedure
C. Best Management Practice
D. Basin Management Plan
Answer: C
, Rationale: BMPs are methods or structures used to control
stormwater quantity and quality.
3. Which pollutant is commonly associated with urban runoff?
A. Nitrogen
B. Oil and grease
C. Sediment
D. All of the above
Answer: D
Rationale: Urban runoff carries multiple pollutants including
nutrients, hydrocarbons, and sediment.
4. What is the first flush effect?
A. The initial surge of stormwater carrying high pollutant loads
B. The final stage of runoff
C. A filtration process
D. A type of BMP
Answer: A
Rationale: The first flush contains the highest concentration of
pollutants washed off surfaces.
5. Which structure is designed to remove sediment from runoff?
A. Detention basin
B. Infiltration trench
, C. Sediment basin
D. Swale
Answer: C
Rationale: Sediment basins are specifically designed to trap and
settle suspended solids.
6. What is the main function of a detention basin?
A. Permanent water storage
B. Immediate discharge
C. Temporary storage and controlled release
D. Filtration only
Answer: C
Rationale: Detention basins temporarily hold stormwater and
release it slowly to prevent flooding.
7. Which inspection item is critical after a storm event?
A. Office equipment
B. Vegetation color
C. Structural integrity of BMPs
D. Employee attendance
Answer: C
Rationale: Storm events can damage infrastructure, making
inspections essential.
, 8. What type of erosion is caused by flowing water removing soil?
A. Wind erosion
B. Sheet erosion
C. Chemical erosion
D. Thermal erosion
Answer: B
Rationale: Sheet erosion involves the removal of a thin layer of
soil by runoff.
9. Which BMP uses vegetation to slow runoff?
A. Concrete channel
B. Vegetated swale
C. Pipe system
D. Storage tank
Answer: B
Rationale: Vegetated swales reduce flow velocity and promote
infiltration.
10. What is the primary purpose of an infiltration basin?
A. Store water permanently
B. Evaporate water
C. Allow water to soak into the ground
D. Filter air
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a stormwater management
system?
A. To treat drinking water
B. To prevent flooding and manage runoff
C. To supply irrigation water
D. To generate electricity
Answer: B
Rationale: Stormwater systems are designed to control runoff,
reduce flooding, and minimize pollution entering water bodies.
2. What does BMP stand for in stormwater management?
A. Best Maintenance Practice
B. Basic Monitoring Procedure
C. Best Management Practice
D. Basin Management Plan
Answer: C
, Rationale: BMPs are methods or structures used to control
stormwater quantity and quality.
3. Which pollutant is commonly associated with urban runoff?
A. Nitrogen
B. Oil and grease
C. Sediment
D. All of the above
Answer: D
Rationale: Urban runoff carries multiple pollutants including
nutrients, hydrocarbons, and sediment.
4. What is the first flush effect?
A. The initial surge of stormwater carrying high pollutant loads
B. The final stage of runoff
C. A filtration process
D. A type of BMP
Answer: A
Rationale: The first flush contains the highest concentration of
pollutants washed off surfaces.
5. Which structure is designed to remove sediment from runoff?
A. Detention basin
B. Infiltration trench
, C. Sediment basin
D. Swale
Answer: C
Rationale: Sediment basins are specifically designed to trap and
settle suspended solids.
6. What is the main function of a detention basin?
A. Permanent water storage
B. Immediate discharge
C. Temporary storage and controlled release
D. Filtration only
Answer: C
Rationale: Detention basins temporarily hold stormwater and
release it slowly to prevent flooding.
7. Which inspection item is critical after a storm event?
A. Office equipment
B. Vegetation color
C. Structural integrity of BMPs
D. Employee attendance
Answer: C
Rationale: Storm events can damage infrastructure, making
inspections essential.
, 8. What type of erosion is caused by flowing water removing soil?
A. Wind erosion
B. Sheet erosion
C. Chemical erosion
D. Thermal erosion
Answer: B
Rationale: Sheet erosion involves the removal of a thin layer of
soil by runoff.
9. Which BMP uses vegetation to slow runoff?
A. Concrete channel
B. Vegetated swale
C. Pipe system
D. Storage tank
Answer: B
Rationale: Vegetated swales reduce flow velocity and promote
infiltration.
10. What is the primary purpose of an infiltration basin?
A. Store water permanently
B. Evaporate water
C. Allow water to soak into the ground
D. Filter air
