NPDES Construction Stormwater
Certification Exam Practice Questions
and Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
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1. What does NPDES stand for?
A. National Pollution Discharge Evaluation System
B. National Permit and Drainage Enforcement Standard
C. National Pollutant Discharge Elimination System
D. National Prevention of Drainage and Erosion System
Correct Answer: C. National Pollutant Discharge Elimination System
Rationale: NPDES is the federal permitting program established under the Clean
Water Act to regulate point-source discharges of pollutants to waters of the
United States. Construction stormwater discharges can require NPDES permit
coverage when applicable regulatory conditions are met.
2. Which construction activity commonly triggers federal NPDES stormwater
permit requirements?
A. Disturbance of one or more acres of land
B. Painting an occupied office
C. Replacing office furniture
D. Performing routine bookkeeping
Correct Answer: A. Disturbance of one or more acres of land
,Rationale: Under the federal construction stormwater program, construction sites
that disturb one or more acres generally require permit coverage, subject to
applicable requirements and exceptions. Projects disturbing less than one acre can
also require coverage when they are part of a common plan of development or
sale that ultimately disturbs one or more acres.
3. What is the primary purpose of an NPDES construction stormwater permit?
A. To regulate construction wages
B. To regulate building occupancy
C. To approve architectural designs
D. To control pollutants discharged in stormwater from construction activities
Correct Answer: D. To control pollutants discharged in stormwater from
construction activities
Rationale: Construction stormwater permits establish requirements for controlling
sediment and other pollutants associated with construction activities. EPA
explains that stormwater can transport sediment, debris, chemicals, and other
pollutants from construction sites to receiving waters.
4. What is the primary purpose of a SWPPP?
A. To establish construction payroll procedures
B. To describe how the site will prevent and control stormwater pollution
C. To replace the NPDES permit
D. To document architectural specifications
Correct Answer: B. To describe how the site will prevent and control stormwater
pollution
Rationale: A Stormwater Pollution Prevention Plan identifies site conditions,
potential pollutant sources, and the erosion, sediment, and pollution-prevention
controls that will be used to comply with applicable permit requirements. EPA
requires the SWPPP to be developed before submission of the NOI under the
federal CGP.
,5. What is the purpose of a Notice of Intent (NOI)?
A. To terminate permit coverage
B. To report a completed inspection
C. To request coverage under an applicable general permit
D. To authorize a contractor's payment
Correct Answer: C. To request coverage under an applicable general permit
Rationale: The NOI provides EPA or the applicable permitting authority with
information about the project and certifies the operator's eligibility for permit
coverage. Under the federal CGP, the NOI is submitted after the operator has
determined eligibility and developed the required SWPPP.
6. Under the federal 2022 CGP, when must an operator of a new covered site
generally submit its NOI?
A. After construction is completed
B. On the final day of construction
C. Within 30 days after final stabilization
D. At least 14 calendar days before commencing construction activities
Correct Answer: D. At least 14 calendar days before commencing construction
activities
Rationale: EPA's federal CGP establishes a 14-calendar-day advance NOI
submission requirement for a new site, subject to the permit's specific provisions.
Authorization generally begins 14 calendar days after EPA acknowledges receipt
of a complete NOI unless EPA delays or denies authorization.
7. Who is generally responsible for obtaining permit coverage when they meet
the federal CGP definition of an operator?
A. The operator of the construction site
B. Every person who visits the site
, C. The nearest property owner regardless of involvement
D. The equipment manufacturer
Correct Answer: A. The operator of the construction site
Rationale: The federal CGP requires the applicant to establish that it is an operator
of the construction site for which discharges will be covered. An operator generally
has operational control over construction plans/specifications or day-to-day
operational control relevant to compliance, as defined by the permit.
8. What is the main pollutant of concern from exposed soil at many construction
sites?
A. Dissolved oxygen
B. Sediment
C. Chlorine gas
D. Thermal energy
Correct Answer: B. Sediment
Rationale: Clearing, grading, excavation, and other earth-disturbing activities
expose soil to rainfall and runoff. Sediment can be transported from the site and
can also carry other pollutants attached to soil particles.
9. Which practice directly reduces the amount of soil exposed to rainfall?
A. Increasing the disturbed area
B. Removing vegetation unnecessarily
C. Phasing construction activities
D. Increasing the length of exposed slopes
Correct Answer: C. Phasing construction activities
Rationale: Phased construction limits the area disturbed at one time and can
reduce the duration that soil remains exposed. This is consistent with the broader
principle of minimizing the generation and transport of sediment.
Certification Exam Practice Questions
and Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
Download Pdf
1. What does NPDES stand for?
A. National Pollution Discharge Evaluation System
B. National Permit and Drainage Enforcement Standard
C. National Pollutant Discharge Elimination System
D. National Prevention of Drainage and Erosion System
Correct Answer: C. National Pollutant Discharge Elimination System
Rationale: NPDES is the federal permitting program established under the Clean
Water Act to regulate point-source discharges of pollutants to waters of the
United States. Construction stormwater discharges can require NPDES permit
coverage when applicable regulatory conditions are met.
2. Which construction activity commonly triggers federal NPDES stormwater
permit requirements?
A. Disturbance of one or more acres of land
B. Painting an occupied office
C. Replacing office furniture
D. Performing routine bookkeeping
Correct Answer: A. Disturbance of one or more acres of land
,Rationale: Under the federal construction stormwater program, construction sites
that disturb one or more acres generally require permit coverage, subject to
applicable requirements and exceptions. Projects disturbing less than one acre can
also require coverage when they are part of a common plan of development or
sale that ultimately disturbs one or more acres.
3. What is the primary purpose of an NPDES construction stormwater permit?
A. To regulate construction wages
B. To regulate building occupancy
C. To approve architectural designs
D. To control pollutants discharged in stormwater from construction activities
Correct Answer: D. To control pollutants discharged in stormwater from
construction activities
Rationale: Construction stormwater permits establish requirements for controlling
sediment and other pollutants associated with construction activities. EPA
explains that stormwater can transport sediment, debris, chemicals, and other
pollutants from construction sites to receiving waters.
4. What is the primary purpose of a SWPPP?
A. To establish construction payroll procedures
B. To describe how the site will prevent and control stormwater pollution
C. To replace the NPDES permit
D. To document architectural specifications
Correct Answer: B. To describe how the site will prevent and control stormwater
pollution
Rationale: A Stormwater Pollution Prevention Plan identifies site conditions,
potential pollutant sources, and the erosion, sediment, and pollution-prevention
controls that will be used to comply with applicable permit requirements. EPA
requires the SWPPP to be developed before submission of the NOI under the
federal CGP.
,5. What is the purpose of a Notice of Intent (NOI)?
A. To terminate permit coverage
B. To report a completed inspection
C. To request coverage under an applicable general permit
D. To authorize a contractor's payment
Correct Answer: C. To request coverage under an applicable general permit
Rationale: The NOI provides EPA or the applicable permitting authority with
information about the project and certifies the operator's eligibility for permit
coverage. Under the federal CGP, the NOI is submitted after the operator has
determined eligibility and developed the required SWPPP.
6. Under the federal 2022 CGP, when must an operator of a new covered site
generally submit its NOI?
A. After construction is completed
B. On the final day of construction
C. Within 30 days after final stabilization
D. At least 14 calendar days before commencing construction activities
Correct Answer: D. At least 14 calendar days before commencing construction
activities
Rationale: EPA's federal CGP establishes a 14-calendar-day advance NOI
submission requirement for a new site, subject to the permit's specific provisions.
Authorization generally begins 14 calendar days after EPA acknowledges receipt
of a complete NOI unless EPA delays or denies authorization.
7. Who is generally responsible for obtaining permit coverage when they meet
the federal CGP definition of an operator?
A. The operator of the construction site
B. Every person who visits the site
, C. The nearest property owner regardless of involvement
D. The equipment manufacturer
Correct Answer: A. The operator of the construction site
Rationale: The federal CGP requires the applicant to establish that it is an operator
of the construction site for which discharges will be covered. An operator generally
has operational control over construction plans/specifications or day-to-day
operational control relevant to compliance, as defined by the permit.
8. What is the main pollutant of concern from exposed soil at many construction
sites?
A. Dissolved oxygen
B. Sediment
C. Chlorine gas
D. Thermal energy
Correct Answer: B. Sediment
Rationale: Clearing, grading, excavation, and other earth-disturbing activities
expose soil to rainfall and runoff. Sediment can be transported from the site and
can also carry other pollutants attached to soil particles.
9. Which practice directly reduces the amount of soil exposed to rainfall?
A. Increasing the disturbed area
B. Removing vegetation unnecessarily
C. Phasing construction activities
D. Increasing the length of exposed slopes
Correct Answer: C. Phasing construction activities
Rationale: Phased construction limits the area disturbed at one time and can
reduce the duration that soil remains exposed. This is consistent with the broader
principle of minimizing the generation and transport of sediment.
