CESSWI CERTIFIED EXAM 2026/2027 | Erosion Sediment &
Stormwater Inspector | Latest Update | Grade A 100% Correct
| Verified Elaborations | Pass Guaranteed
Section 1: Regulatory Framework & NPDES Compliance (Q1-15)
Q1. Under the Clean Water Act (CWA), which section establishes the National Pollutant
Discharge Elimination System (NPDES) permit program for point source discharges?
A. Section 301
B. Section 402 [CORRECT]
C. Section 404
D. Section 305
Rationale: CWA Section 402 establishes the NPDES program, requiring permits for
discharges of pollutants from point sources into waters of the United States. Section
301 establishes effluent limitations, Section 404 governs dredge and fill activities under
Army Corps jurisdiction, and Section 305 addresses water quality standards.
"Correct Answer: B"
Q2. A developer proposes to fill 2.5 acres of jurisdictional wetland to create a building
pad. Which CWA section and associated permit program governs this activity?
A. Section 402 and the NPDES Construction General Permit
B. Section 404 and the Army Corps of Engineers Individual Permit [CORRECT]
C. Section 301 and the State Water Quality Certification
D. Section 319 and the Nonpoint Source Management Program
Rationale: CWA Section 404 grants the U.S. Army Corps of Engineers authority to
regulate discharges of dredged or fill material into waters of the United States, including
,wetlands. The NPDES program under Section 402 governs stormwater discharges, not
fill activities.
"Correct Answer: B"
Q3. Under the 2026 updated Waters of the United States (WOTUS) definition, a
construction site discharges stormwater into an ephemeral stream that flows only after
rainfall events and lacks a continuous surface connection to traditional navigable
waters. Based on current jurisdictional determinations, this ephemeral stream is:
A. Automatically jurisdictional as a tributary under the significant nexus test
B. Not jurisdictional because it lacks a relatively permanent surface water connection
[CORRECT]
C. Jurisdictional only if it contains anadromous fish
D. Jurisdictional under all circumstances because it conveys stormwater
Rationale: The 2026 WOTUS framework, consistent with the Sackett v. EPA
interpretation, limits CWA jurisdiction to relatively permanent waters with a continuous
surface connection to traditional navigable waters. Ephemeral streams lacking such
connections are generally not jurisdictional, though site-specific determinations are
required.
"Correct Answer: B"
Q4. The 2026 EPA Construction General Permit (CGP) update introduces new
monitoring requirements for per- and polyfluoroalkyl substances (PFAS) at construction
sites. Under this update, which sites are required to sample stormwater discharges for
PFAS?
A. All construction sites disturbing greater than 1 acre
B. Only sites located within designated PFAS-impacted watersheds or using
PFAS-containing materials such as certain firefighting foams, coatings, or treated
fabrics [CORRECT]
C. Only residential construction sites
D. No construction sites are required to monitor for PFAS under the CGP
,Rationale: The 2026 CGP update targets PFAS monitoring at sites with elevated risk
profiles, including those in designated PFAS-impacted watersheds or using materials
known to contain PFAS, rather than imposing universal monitoring on all construction
disturbances.
"Correct Answer: B"
Q5. The 2026 EPA CGP mandates electronic reporting for all Notice of Intent (NOI),
Notice of Termination (NOT), and Discharge Monitoring Report (DMR) submissions.
Which EPA system must be used for these electronic submissions?
A. EPA's Central Data Exchange (CDX) via the NPDES eReporting Tool (NeT)[CORRECT]
B. State-specific paper mail systems with scanned PDF backup
C. Email submission to the regional EPA office
D. Physical submission to the Army Corps of Engineers
Rationale: The NPDES eReporting Rule and 2026 CGP require all permitted entities to
use EPA's CDX/NeT system for electronic submission of NOIs, NOTs, and DMRs,
eliminating paper-based submission pathways and creating a centralized compliance
database.
"Correct Answer: A"
Q6. The 2026 EPA CGP incorporates climate resilience provisions requiring construction
sites to account for increased rainfall intensity. For a site in a region where the 10-year,
24-hour rainfall event has increased by 15% based on updated NOAA Atlas 14 data,
which design parameter must be adjusted?
A. The site area threshold for permit coverage
B. The sizing of sediment basins and temporary sediment traps to handle increased
runoff volumes [CORRECT]
C. The frequency of SWPPP updates, which must now occur daily
D. The allowable pH range for dewatering discharges
, Rationale: Climate resilience provisions in the 2026 CGP require BMPs to be sized
based on current rainfall data rather than historical averages; sediment basins and traps
must accommodate increased runoff volumes from more intense precipitation events
to prevent overtopping and offsite sediment discharge.
"Correct Answer: B"
Q7. Under the 2026 EPA CGP update, which modification was made to the turbidity
monitoring requirements for construction sites discharging to waters designated as Tier
2 or Tier 3 (Outstanding National Resource Waters)?
A. Turbidity monitoring was eliminated for all construction sites
B. Enhanced turbidity limits of 50 NTU and mandatory continuous monitoring during
active discharge events were implemented [CORRECT]
C. Turbidity limits were increased to 280 NTU for all sites
D. Only weekly grab sampling is required regardless of discharge status
Rationale: The 2026 CGP strengthens protections for high-quality waters by imposing
stricter turbidity limits (50 NTU) and requiring continuous monitoring during discharge
events at sites affecting Tier 2/3 waters, ensuring real-time detection of sediment-laden
runoff.
"Correct Answer: B"
Q8. The 2026 EPA CGP update modifies post-construction stormwater management
requirements for common development projects. Which new provision applies to sites
that create or replace impervious surfaces exceeding 20,000 square feet?
A. Exemption from all stormwater requirements
B. Mandatory installation of green infrastructure or low-impact development (LID)
practices to retain the 95th percentile rainfall event [CORRECT]
C. Permission to discharge untreated stormwater directly to municipal sewers
D. Requirement to install only conventional detention ponds
Stormwater Inspector | Latest Update | Grade A 100% Correct
| Verified Elaborations | Pass Guaranteed
Section 1: Regulatory Framework & NPDES Compliance (Q1-15)
Q1. Under the Clean Water Act (CWA), which section establishes the National Pollutant
Discharge Elimination System (NPDES) permit program for point source discharges?
A. Section 301
B. Section 402 [CORRECT]
C. Section 404
D. Section 305
Rationale: CWA Section 402 establishes the NPDES program, requiring permits for
discharges of pollutants from point sources into waters of the United States. Section
301 establishes effluent limitations, Section 404 governs dredge and fill activities under
Army Corps jurisdiction, and Section 305 addresses water quality standards.
"Correct Answer: B"
Q2. A developer proposes to fill 2.5 acres of jurisdictional wetland to create a building
pad. Which CWA section and associated permit program governs this activity?
A. Section 402 and the NPDES Construction General Permit
B. Section 404 and the Army Corps of Engineers Individual Permit [CORRECT]
C. Section 301 and the State Water Quality Certification
D. Section 319 and the Nonpoint Source Management Program
Rationale: CWA Section 404 grants the U.S. Army Corps of Engineers authority to
regulate discharges of dredged or fill material into waters of the United States, including
,wetlands. The NPDES program under Section 402 governs stormwater discharges, not
fill activities.
"Correct Answer: B"
Q3. Under the 2026 updated Waters of the United States (WOTUS) definition, a
construction site discharges stormwater into an ephemeral stream that flows only after
rainfall events and lacks a continuous surface connection to traditional navigable
waters. Based on current jurisdictional determinations, this ephemeral stream is:
A. Automatically jurisdictional as a tributary under the significant nexus test
B. Not jurisdictional because it lacks a relatively permanent surface water connection
[CORRECT]
C. Jurisdictional only if it contains anadromous fish
D. Jurisdictional under all circumstances because it conveys stormwater
Rationale: The 2026 WOTUS framework, consistent with the Sackett v. EPA
interpretation, limits CWA jurisdiction to relatively permanent waters with a continuous
surface connection to traditional navigable waters. Ephemeral streams lacking such
connections are generally not jurisdictional, though site-specific determinations are
required.
"Correct Answer: B"
Q4. The 2026 EPA Construction General Permit (CGP) update introduces new
monitoring requirements for per- and polyfluoroalkyl substances (PFAS) at construction
sites. Under this update, which sites are required to sample stormwater discharges for
PFAS?
A. All construction sites disturbing greater than 1 acre
B. Only sites located within designated PFAS-impacted watersheds or using
PFAS-containing materials such as certain firefighting foams, coatings, or treated
fabrics [CORRECT]
C. Only residential construction sites
D. No construction sites are required to monitor for PFAS under the CGP
,Rationale: The 2026 CGP update targets PFAS monitoring at sites with elevated risk
profiles, including those in designated PFAS-impacted watersheds or using materials
known to contain PFAS, rather than imposing universal monitoring on all construction
disturbances.
"Correct Answer: B"
Q5. The 2026 EPA CGP mandates electronic reporting for all Notice of Intent (NOI),
Notice of Termination (NOT), and Discharge Monitoring Report (DMR) submissions.
Which EPA system must be used for these electronic submissions?
A. EPA's Central Data Exchange (CDX) via the NPDES eReporting Tool (NeT)[CORRECT]
B. State-specific paper mail systems with scanned PDF backup
C. Email submission to the regional EPA office
D. Physical submission to the Army Corps of Engineers
Rationale: The NPDES eReporting Rule and 2026 CGP require all permitted entities to
use EPA's CDX/NeT system for electronic submission of NOIs, NOTs, and DMRs,
eliminating paper-based submission pathways and creating a centralized compliance
database.
"Correct Answer: A"
Q6. The 2026 EPA CGP incorporates climate resilience provisions requiring construction
sites to account for increased rainfall intensity. For a site in a region where the 10-year,
24-hour rainfall event has increased by 15% based on updated NOAA Atlas 14 data,
which design parameter must be adjusted?
A. The site area threshold for permit coverage
B. The sizing of sediment basins and temporary sediment traps to handle increased
runoff volumes [CORRECT]
C. The frequency of SWPPP updates, which must now occur daily
D. The allowable pH range for dewatering discharges
, Rationale: Climate resilience provisions in the 2026 CGP require BMPs to be sized
based on current rainfall data rather than historical averages; sediment basins and traps
must accommodate increased runoff volumes from more intense precipitation events
to prevent overtopping and offsite sediment discharge.
"Correct Answer: B"
Q7. Under the 2026 EPA CGP update, which modification was made to the turbidity
monitoring requirements for construction sites discharging to waters designated as Tier
2 or Tier 3 (Outstanding National Resource Waters)?
A. Turbidity monitoring was eliminated for all construction sites
B. Enhanced turbidity limits of 50 NTU and mandatory continuous monitoring during
active discharge events were implemented [CORRECT]
C. Turbidity limits were increased to 280 NTU for all sites
D. Only weekly grab sampling is required regardless of discharge status
Rationale: The 2026 CGP strengthens protections for high-quality waters by imposing
stricter turbidity limits (50 NTU) and requiring continuous monitoring during discharge
events at sites affecting Tier 2/3 waters, ensuring real-time detection of sediment-laden
runoff.
"Correct Answer: B"
Q8. The 2026 EPA CGP update modifies post-construction stormwater management
requirements for common development projects. Which new provision applies to sites
that create or replace impervious surfaces exceeding 20,000 square feet?
A. Exemption from all stormwater requirements
B. Mandatory installation of green infrastructure or low-impact development (LID)
practices to retain the 95th percentile rainfall event [CORRECT]
C. Permission to discharge untreated stormwater directly to municipal sewers
D. Requirement to install only conventional detention ponds
