Certified Stormwater Inspector (CSI)
Practice Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
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1. Which of the following is the primary purpose of a stormwater inspection?
A. To assess property value
B. To ensure compliance with stormwater regulations
C. To check water usage efficiency
D. To design new stormwater systems
Correct Answer: B
Rationale: Stormwater inspections are primarily conducted to verify that
construction sites and developed areas comply with federal, state, and local
stormwater regulations, minimizing pollution risks to receiving waters.
2. The Clean Water Act (CWA) is enforced by which federal agency?
A. CDC
B. EPA
C. OSHA
D. USGS
Correct Answer: B
Rationale: The Environmental Protection Agency (EPA) enforces the Clean Water
Act, which regulates discharges of pollutants into waters of the United States.
,3. Which type of stormwater control measure is designed to slow runoff and
remove sediments?
A. Oil separator
B. Sediment basin
C. Green roof
D. Rain barrel
Correct Answer: B
Rationale: Sediment basins are designed to hold stormwater, allowing sediment to
settle before water is discharged, effectively reducing erosion and sediment
pollution.
4. What is the first step when conducting a stormwater site inspection?
A. Collect water samples
B. Review the site's Stormwater Pollution Prevention Plan (SWPPP)
C. Install BMPs
D. Notify the local municipality
Correct Answer: B
Rationale: Before conducting a site inspection, the inspector should review the site's
SWPPP to understand what BMPs should be in place and what the compliance
requirements are.
5. What is the primary purpose of a Stormwater Pollution Prevention Plan
(SWPPP)?
A. To manage groundwater recharge
B. To prevent pollutants from entering stormwater runoff
C. To regulate potable water use
D. To control indoor wastewater
,Correct Answer: B
Rationale: A SWPPP identifies potential pollutant sources and outlines best
management practices (BMPs) to prevent contaminants from entering stormwater
runoff.
6. Which federal law establishes the basis for stormwater regulation in the United
States?
A. Safe Drinking Water Act
B. Resource Conservation and Recovery Act
C. Clean Water Act
D. National Environmental Policy Act
Correct Answer: C
Rationale: The Clean Water Act authorizes the NPDES program, which regulates
stormwater discharges to waters of the United States.
7. What permit typically regulates construction site stormwater discharges?
A. Individual Industrial Permit
B. Municipal Separate Storm Sewer System Permit
C. Construction General Permit (CGP)
D. Underground Injection Control Permit
Correct Answer: C
Rationale: The Construction General Permit (CGP) applies to construction activities
disturbing one acre or more and sets stormwater compliance requirements.
8. What does BMP stand for in stormwater management?
A. Best Maintenance Practice
B. Basic Monitoring Procedure
, C. Best Management Practice
D. Basin Management Plan
Correct Answer: C
Rationale: BMPs are methods, measures, or structures used to control stormwater
quantity and quality.
9. Which pollutant is commonly associated with urban runoff?
A. Nitrogen
B. Oil and grease
C. Sediment
D. All of the above
Correct Answer: D
Rationale: Urban runoff carries multiple pollutants including nutrients (nitrogen,
phosphorus), hydrocarbons (oil and grease), and sediment.
10. 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
Correct Answer: A
Rationale: The first flush contains the highest concentration of pollutants washed
off impervious surfaces during the initial period of a storm event.
11. Which structure is designed to remove sediment from runoff?
A. Detention basin
B. Infiltration trench
Practice Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
1. Which of the following is the primary purpose of a stormwater inspection?
A. To assess property value
B. To ensure compliance with stormwater regulations
C. To check water usage efficiency
D. To design new stormwater systems
Correct Answer: B
Rationale: Stormwater inspections are primarily conducted to verify that
construction sites and developed areas comply with federal, state, and local
stormwater regulations, minimizing pollution risks to receiving waters.
2. The Clean Water Act (CWA) is enforced by which federal agency?
A. CDC
B. EPA
C. OSHA
D. USGS
Correct Answer: B
Rationale: The Environmental Protection Agency (EPA) enforces the Clean Water
Act, which regulates discharges of pollutants into waters of the United States.
,3. Which type of stormwater control measure is designed to slow runoff and
remove sediments?
A. Oil separator
B. Sediment basin
C. Green roof
D. Rain barrel
Correct Answer: B
Rationale: Sediment basins are designed to hold stormwater, allowing sediment to
settle before water is discharged, effectively reducing erosion and sediment
pollution.
4. What is the first step when conducting a stormwater site inspection?
A. Collect water samples
B. Review the site's Stormwater Pollution Prevention Plan (SWPPP)
C. Install BMPs
D. Notify the local municipality
Correct Answer: B
Rationale: Before conducting a site inspection, the inspector should review the site's
SWPPP to understand what BMPs should be in place and what the compliance
requirements are.
5. What is the primary purpose of a Stormwater Pollution Prevention Plan
(SWPPP)?
A. To manage groundwater recharge
B. To prevent pollutants from entering stormwater runoff
C. To regulate potable water use
D. To control indoor wastewater
,Correct Answer: B
Rationale: A SWPPP identifies potential pollutant sources and outlines best
management practices (BMPs) to prevent contaminants from entering stormwater
runoff.
6. Which federal law establishes the basis for stormwater regulation in the United
States?
A. Safe Drinking Water Act
B. Resource Conservation and Recovery Act
C. Clean Water Act
D. National Environmental Policy Act
Correct Answer: C
Rationale: The Clean Water Act authorizes the NPDES program, which regulates
stormwater discharges to waters of the United States.
7. What permit typically regulates construction site stormwater discharges?
A. Individual Industrial Permit
B. Municipal Separate Storm Sewer System Permit
C. Construction General Permit (CGP)
D. Underground Injection Control Permit
Correct Answer: C
Rationale: The Construction General Permit (CGP) applies to construction activities
disturbing one acre or more and sets stormwater compliance requirements.
8. What does BMP stand for in stormwater management?
A. Best Maintenance Practice
B. Basic Monitoring Procedure
, C. Best Management Practice
D. Basin Management Plan
Correct Answer: C
Rationale: BMPs are methods, measures, or structures used to control stormwater
quantity and quality.
9. Which pollutant is commonly associated with urban runoff?
A. Nitrogen
B. Oil and grease
C. Sediment
D. All of the above
Correct Answer: D
Rationale: Urban runoff carries multiple pollutants including nutrients (nitrogen,
phosphorus), hydrocarbons (oil and grease), and sediment.
10. 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
Correct Answer: A
Rationale: The first flush contains the highest concentration of pollutants washed
off impervious surfaces during the initial period of a storm event.
11. Which structure is designed to remove sediment from runoff?
A. Detention basin
B. Infiltration trench
