NPDES Erosion & Sediment Control
Inspector Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of an erosion and sediment control
inspection under an NPDES construction permit?
A. To verify that construction equipment meets fuel efficiency standards
B. To ensure stormwater controls prevent sediment from leaving the site
C. To measure the productivity of construction crews
D. To determine the final property value after construction
Answer: B. To ensure stormwater controls prevent sediment from leaving
the site
Rationale: Erosion and sediment control inspections are focused on
verifying that best management practices (BMPs) are functioning properly
to minimize sediment discharge and protect receiving waters.
, 2. Under the NPDES Construction Stormwater Program, erosion control
primarily focuses on:
A. Removing all vegetation before construction begins
B. Preventing soil particles from becoming detached and transported
C. Increasing stormwater flow velocity
D. Eliminating all rainfall from contacting soil
Answer: B. Preventing soil particles from becoming detached and
transported
Rationale: Erosion control practices reduce soil disturbance and prevent
particles from being detached by wind, water, or construction activities.
3. Sediment control measures are designed mainly to:
A. Stop rainfall from occurring
B. Stabilize construction machinery
C. Capture and retain displaced soil before discharge
D. Increase drainage channel speed
Answer: C. Capture and retain displaced soil before discharge
Rationale: Sediment controls trap soil particles after erosion has occurred,
preventing them from leaving the construction site.
4. The Stormwater Pollution Prevention Plan (SWPPP) is intended to:
,A. Document how stormwater pollution will be prevented and managed
B. Replace all construction drawings
C. Eliminate the need for inspections
D. Approve building permits automatically
Answer: A. Document how stormwater pollution will be prevented and
managed
Rationale: The SWPPP identifies potential pollution sources, BMPs,
inspection procedures, and corrective actions required during construction.
5. Which factor most increases erosion potential on a construction site?
A. Gentle slopes with dense vegetation
B. Exposed soil on steep slopes
C. Fully stabilized surfaces
D. Covered storage areas
Answer: B. Exposed soil on steep slopes
Rationale: Steep slopes and exposed soils allow runoff to gain energy and
transport larger amounts of sediment.
6. A properly installed silt fence should primarily:
A. Divert all stormwater away from the site
B. Act as a temporary sediment barrier
, C. Replace permanent drainage systems
D. Prevent all soil disturbance
Answer: B. Act as a temporary sediment barrier
Rationale: Silt fences slow runoff and allow sediment to settle before
water passes through the fabric.
7. Inspectors should check erosion and sediment controls:
A. Only after construction ends
B. Before and after significant storm events as required
C. Only once per year
D. Only when complaints occur
Answer: B. Before and after significant storm events as required
Rationale: Regular inspections identify failures early and ensure BMPs
remain effective during changing site conditions.
8. The main purpose of a stabilized construction entrance is to:
A. Improve vehicle speed
B. Reduce tracking of sediment onto public roads
C. Increase soil compaction everywhere
D. Eliminate stormwater runoff
Answer: B. Reduce tracking of sediment onto public roads
Inspector Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of an erosion and sediment control
inspection under an NPDES construction permit?
A. To verify that construction equipment meets fuel efficiency standards
B. To ensure stormwater controls prevent sediment from leaving the site
C. To measure the productivity of construction crews
D. To determine the final property value after construction
Answer: B. To ensure stormwater controls prevent sediment from leaving
the site
Rationale: Erosion and sediment control inspections are focused on
verifying that best management practices (BMPs) are functioning properly
to minimize sediment discharge and protect receiving waters.
, 2. Under the NPDES Construction Stormwater Program, erosion control
primarily focuses on:
A. Removing all vegetation before construction begins
B. Preventing soil particles from becoming detached and transported
C. Increasing stormwater flow velocity
D. Eliminating all rainfall from contacting soil
Answer: B. Preventing soil particles from becoming detached and
transported
Rationale: Erosion control practices reduce soil disturbance and prevent
particles from being detached by wind, water, or construction activities.
3. Sediment control measures are designed mainly to:
A. Stop rainfall from occurring
B. Stabilize construction machinery
C. Capture and retain displaced soil before discharge
D. Increase drainage channel speed
Answer: C. Capture and retain displaced soil before discharge
Rationale: Sediment controls trap soil particles after erosion has occurred,
preventing them from leaving the construction site.
4. The Stormwater Pollution Prevention Plan (SWPPP) is intended to:
,A. Document how stormwater pollution will be prevented and managed
B. Replace all construction drawings
C. Eliminate the need for inspections
D. Approve building permits automatically
Answer: A. Document how stormwater pollution will be prevented and
managed
Rationale: The SWPPP identifies potential pollution sources, BMPs,
inspection procedures, and corrective actions required during construction.
5. Which factor most increases erosion potential on a construction site?
A. Gentle slopes with dense vegetation
B. Exposed soil on steep slopes
C. Fully stabilized surfaces
D. Covered storage areas
Answer: B. Exposed soil on steep slopes
Rationale: Steep slopes and exposed soils allow runoff to gain energy and
transport larger amounts of sediment.
6. A properly installed silt fence should primarily:
A. Divert all stormwater away from the site
B. Act as a temporary sediment barrier
, C. Replace permanent drainage systems
D. Prevent all soil disturbance
Answer: B. Act as a temporary sediment barrier
Rationale: Silt fences slow runoff and allow sediment to settle before
water passes through the fabric.
7. Inspectors should check erosion and sediment controls:
A. Only after construction ends
B. Before and after significant storm events as required
C. Only once per year
D. Only when complaints occur
Answer: B. Before and after significant storm events as required
Rationale: Regular inspections identify failures early and ensure BMPs
remain effective during changing site conditions.
8. The main purpose of a stabilized construction entrance is to:
A. Improve vehicle speed
B. Reduce tracking of sediment onto public roads
C. Increase soil compaction everywhere
D. Eliminate stormwater runoff
Answer: B. Reduce tracking of sediment onto public roads
