Certified Stormwater Inspector Exam Practice
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a stormwater management
program?
A. To increase urban development
B. To reduce pollutants entering water bodies
C. To improve air quality
D. To control traffic flow
Stormwater programs aim to reduce pollutants, sediment, and
debris from entering rivers, lakes, and streams.
2. Which of the following is a common structural best management
practice (BMP) for stormwater control?
A. Rainwater harvesting
B. Detention basins
C. Composting
D. Green roofs
Detention basins temporarily store stormwater and release it
slowly to reduce flooding and erosion.
3. During a site inspection, you notice sediment-laden water leaving
a construction site. What should be your first action?
A. Document and ignore
B. Document, notify the responsible party, and require
corrective action
C. Immediately call law enforcement
, D. Install permanent structures yourself
Inspectors must record violations and require corrective measures;
direct enforcement depends on regulatory authority.
4. Which regulatory program governs stormwater discharges from
construction sites in the U.S.?
A. Clean Air Act
B. Resource Conservation and Recovery Act
C. Safe Drinking Water Act
D. Clean Water Act (NPDES program)
The NPDES program under the Clean Water Act regulates
stormwater discharges to protect water quality.
5. What is the purpose of a silt fence on a construction site?
A. To prevent air pollution
B. To direct traffic
C. To prevent sediment from leaving the site
D. To improve site aesthetics
Silt fences trap sediment in runoff, preventing it from entering
storm drains or waterways.
6. How often should stormwater BMPs at construction sites typically
be inspected?
A. Once a year
B. At least weekly and after significant rainfall events
C. Once every month
D. Only at project completion
Frequent inspections ensure BMPs are functioning properly and
prevent environmental violations.
7. Which type of stormwater BMP is designed to promote infiltration
into the ground?
A. Detention pond
, B. Swale
C. Rain garden
D. Roof gutter
Rain gardens and infiltration trenches allow stormwater to soak
into the soil, reducing runoff volume.
8. What does TSS stand for in stormwater monitoring?
A. Total Soil Saturation
B. Total Sulfate Solids
C. Total Suspended Solids
D. Total Stormwater Sampling
TSS measures particles suspended in stormwater, indicating
sediment pollution.
9. If an inspector finds an illicit connection to a storm drain, the first
step is to:
A. Ignore it
B. Remove it immediately
C. Document and report it to the proper authorities
D. Redirect it to another drain
Illicit discharges must be reported and corrected to prevent water
contamination.
10. What is the purpose of a stormwater pollution prevention
plan (SWPPP)?
A. To promote construction efficiency
B. To reduce construction costs
C. To outline practices that minimize stormwater pollution from
a site
D. To schedule project workers
SWPPPs describe BMPs, inspection schedules, and maintenance to
comply with regulatory requirements.
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a stormwater management
program?
A. To increase urban development
B. To reduce pollutants entering water bodies
C. To improve air quality
D. To control traffic flow
Stormwater programs aim to reduce pollutants, sediment, and
debris from entering rivers, lakes, and streams.
2. Which of the following is a common structural best management
practice (BMP) for stormwater control?
A. Rainwater harvesting
B. Detention basins
C. Composting
D. Green roofs
Detention basins temporarily store stormwater and release it
slowly to reduce flooding and erosion.
3. During a site inspection, you notice sediment-laden water leaving
a construction site. What should be your first action?
A. Document and ignore
B. Document, notify the responsible party, and require
corrective action
C. Immediately call law enforcement
, D. Install permanent structures yourself
Inspectors must record violations and require corrective measures;
direct enforcement depends on regulatory authority.
4. Which regulatory program governs stormwater discharges from
construction sites in the U.S.?
A. Clean Air Act
B. Resource Conservation and Recovery Act
C. Safe Drinking Water Act
D. Clean Water Act (NPDES program)
The NPDES program under the Clean Water Act regulates
stormwater discharges to protect water quality.
5. What is the purpose of a silt fence on a construction site?
A. To prevent air pollution
B. To direct traffic
C. To prevent sediment from leaving the site
D. To improve site aesthetics
Silt fences trap sediment in runoff, preventing it from entering
storm drains or waterways.
6. How often should stormwater BMPs at construction sites typically
be inspected?
A. Once a year
B. At least weekly and after significant rainfall events
C. Once every month
D. Only at project completion
Frequent inspections ensure BMPs are functioning properly and
prevent environmental violations.
7. Which type of stormwater BMP is designed to promote infiltration
into the ground?
A. Detention pond
, B. Swale
C. Rain garden
D. Roof gutter
Rain gardens and infiltration trenches allow stormwater to soak
into the soil, reducing runoff volume.
8. What does TSS stand for in stormwater monitoring?
A. Total Soil Saturation
B. Total Sulfate Solids
C. Total Suspended Solids
D. Total Stormwater Sampling
TSS measures particles suspended in stormwater, indicating
sediment pollution.
9. If an inspector finds an illicit connection to a storm drain, the first
step is to:
A. Ignore it
B. Remove it immediately
C. Document and report it to the proper authorities
D. Redirect it to another drain
Illicit discharges must be reported and corrected to prevent water
contamination.
10. What is the purpose of a stormwater pollution prevention
plan (SWPPP)?
A. To promote construction efficiency
B. To reduce construction costs
C. To outline practices that minimize stormwater pollution from
a site
D. To schedule project workers
SWPPPs describe BMPs, inspection schedules, and maintenance to
comply with regulatory requirements.
