Stormwater Compliance Inspector Exam
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
Question 1
What is the primary purpose of the NPDES stormwater permitting program?
A. To regulate drinking-water treatment
B. To regulate groundwater extraction
C. To control pollutant discharges to waters of the United States
D. To establish building-code requirements
Correct Answer: C. To control pollutant discharges to waters of the United
States
The National Pollutant Discharge Elimination System (NPDES) regulates point-
source discharges of pollutants to waters of the United States. Stormwater
permits establish requirements intended to reduce pollutant discharges associated
with regulated activities.
Question 2
What is the primary purpose of a Stormwater Pollution Prevention Plan (SWPPP)?
A. To establish employee payroll procedures
B. To describe how a site will prevent or minimize stormwater pollution
C. To replace all construction plans
D. To determine property taxes
Correct Answer: B. To describe how a site will prevent or minimize stormwater
pollution
,A SWPPP identifies potential pollutant sources and describes control measures,
inspection procedures, maintenance requirements, and other practices used to
reduce stormwater pollution from the regulated activity.
Question 3
Which construction activity is a major concern for stormwater compliance?
A. Office administration
B. Indoor computer use
C. Soil disturbance and exposed earth
D. Employee scheduling
Correct Answer: C. Soil disturbance and exposed earth
Disturbed soil is particularly susceptible to erosion. Rainfall and runoff can
transport sediment from exposed areas into drainage systems and receiving
waters.
Question 4
What is the primary difference between erosion and sedimentation?
A. Erosion occurs only in rivers.
B. Sedimentation occurs before soil is detached.
C. Erosion involves soil detachment and transport, while sedimentation involves
deposition of transported material.
D. They are identical processes.
Correct Answer: C. Erosion involves soil detachment and transport, while
sedimentation involves deposition of transported material.
Erosion includes the detachment and movement of soil particles by agents such as
water or wind. Sedimentation occurs when transported particles settle out of the
moving water.
Question 5
,Which factor generally increases the potential for soil erosion?
A. Stable vegetation cover
B. Reduced runoff velocity
C. Exposed and disturbed soil
D. Properly installed erosion controls
Correct Answer: C. Exposed and disturbed soil
Removing vegetation and disturbing soil can substantially increase its
susceptibility to erosion. Maintaining stabilization and controlling runoff are
therefore fundamental construction stormwater practices.
Question 6
What is the primary function of a silt fence?
A. To treat drinking water
B. To eliminate all runoff
C. To intercept and slow shallow sheet flow and retain sediment
D. To measure rainfall
Correct Answer: C. To intercept and slow shallow sheet flow and retain
sediment
Silt fences are sediment-control measures generally intended to intercept sheet
flow and allow sediment to settle before runoff leaves the disturbed area. They
are not designed to handle concentrated high-velocity flows.
Question 7
Why must a silt fence be properly entrenched?
A. To increase the site's electrical capacity
B. To make the fence visually attractive
C. To reduce the likelihood that runoff will pass underneath it
D. To increase rainfall intensity
Correct Answer: C. To reduce the likelihood that runoff will pass underneath it
, If the lower portion of a silt fence is not properly secured or entrenched, runoff can
undermine the control and carry sediment beneath it.
Question 8
What is the primary purpose of a stabilized construction entrance?
A. To increase vehicle speed
B. To store construction chemicals
C. To reduce tracking of sediment from the site onto public roads
D. To replace perimeter controls
Correct Answer: C. To reduce tracking of sediment from the site onto public
roads
Construction vehicles can carry soil and sediment onto paved roads. A properly
designed and maintained stabilized entrance helps reduce this source of sediment
pollution.
Question 9
What should an inspector look for when evaluating a construction entrance?
A. Whether it has decorative lighting
B. Evidence of sediment tracking onto adjacent roads
C. Whether vehicles exceed the site's maximum speed
D. Whether the entrance contains office equipment
Correct Answer: B. Evidence of sediment tracking onto adjacent roads
Visible tracking indicates that the entrance control may not be functioning
effectively or may require maintenance. The inspector should document observed
conditions and evaluate them against applicable requirements.
Question 10
What is the primary purpose of perimeter controls on a construction site?
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
Question 1
What is the primary purpose of the NPDES stormwater permitting program?
A. To regulate drinking-water treatment
B. To regulate groundwater extraction
C. To control pollutant discharges to waters of the United States
D. To establish building-code requirements
Correct Answer: C. To control pollutant discharges to waters of the United
States
The National Pollutant Discharge Elimination System (NPDES) regulates point-
source discharges of pollutants to waters of the United States. Stormwater
permits establish requirements intended to reduce pollutant discharges associated
with regulated activities.
Question 2
What is the primary purpose of a Stormwater Pollution Prevention Plan (SWPPP)?
A. To establish employee payroll procedures
B. To describe how a site will prevent or minimize stormwater pollution
C. To replace all construction plans
D. To determine property taxes
Correct Answer: B. To describe how a site will prevent or minimize stormwater
pollution
,A SWPPP identifies potential pollutant sources and describes control measures,
inspection procedures, maintenance requirements, and other practices used to
reduce stormwater pollution from the regulated activity.
Question 3
Which construction activity is a major concern for stormwater compliance?
A. Office administration
B. Indoor computer use
C. Soil disturbance and exposed earth
D. Employee scheduling
Correct Answer: C. Soil disturbance and exposed earth
Disturbed soil is particularly susceptible to erosion. Rainfall and runoff can
transport sediment from exposed areas into drainage systems and receiving
waters.
Question 4
What is the primary difference between erosion and sedimentation?
A. Erosion occurs only in rivers.
B. Sedimentation occurs before soil is detached.
C. Erosion involves soil detachment and transport, while sedimentation involves
deposition of transported material.
D. They are identical processes.
Correct Answer: C. Erosion involves soil detachment and transport, while
sedimentation involves deposition of transported material.
Erosion includes the detachment and movement of soil particles by agents such as
water or wind. Sedimentation occurs when transported particles settle out of the
moving water.
Question 5
,Which factor generally increases the potential for soil erosion?
A. Stable vegetation cover
B. Reduced runoff velocity
C. Exposed and disturbed soil
D. Properly installed erosion controls
Correct Answer: C. Exposed and disturbed soil
Removing vegetation and disturbing soil can substantially increase its
susceptibility to erosion. Maintaining stabilization and controlling runoff are
therefore fundamental construction stormwater practices.
Question 6
What is the primary function of a silt fence?
A. To treat drinking water
B. To eliminate all runoff
C. To intercept and slow shallow sheet flow and retain sediment
D. To measure rainfall
Correct Answer: C. To intercept and slow shallow sheet flow and retain
sediment
Silt fences are sediment-control measures generally intended to intercept sheet
flow and allow sediment to settle before runoff leaves the disturbed area. They
are not designed to handle concentrated high-velocity flows.
Question 7
Why must a silt fence be properly entrenched?
A. To increase the site's electrical capacity
B. To make the fence visually attractive
C. To reduce the likelihood that runoff will pass underneath it
D. To increase rainfall intensity
Correct Answer: C. To reduce the likelihood that runoff will pass underneath it
, If the lower portion of a silt fence is not properly secured or entrenched, runoff can
undermine the control and carry sediment beneath it.
Question 8
What is the primary purpose of a stabilized construction entrance?
A. To increase vehicle speed
B. To store construction chemicals
C. To reduce tracking of sediment from the site onto public roads
D. To replace perimeter controls
Correct Answer: C. To reduce tracking of sediment from the site onto public
roads
Construction vehicles can carry soil and sediment onto paved roads. A properly
designed and maintained stabilized entrance helps reduce this source of sediment
pollution.
Question 9
What should an inspector look for when evaluating a construction entrance?
A. Whether it has decorative lighting
B. Evidence of sediment tracking onto adjacent roads
C. Whether vehicles exceed the site's maximum speed
D. Whether the entrance contains office equipment
Correct Answer: B. Evidence of sediment tracking onto adjacent roads
Visible tracking indicates that the entrance control may not be functioning
effectively or may require maintenance. The inspector should document observed
conditions and evaluate them against applicable requirements.
Question 10
What is the primary purpose of perimeter controls on a construction site?
