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Under EPA 40 CFR Part 122, which federal permit program regulates stormwater discharges from most construction sites that disturb one or more acres?

A
B
C
D
to track
2026 Statistics

Key Facts: CESSWI Exam

2 sections

Exam Structure

EnviroCert

100-120

Questions per Section

ECI FAQ

70%

Passing Score

EnviroCert

90 min

Per-Section Time

EnviroCert FAQ

$345

Prometric Exam Fee

EnviroCert 2026

$370

Application Review

EnviroCert 2026

6 PDHs/yr

Renewal PDHs

ECI Renewal

Prometric

Delivery

EnviroCert

CESSWI is a Prometric-delivered, closed-book two-section professional certification awarded by EnviroCert International for construction-site erosion and sediment inspectors. Candidates pass each section at 70% or higher, pay a $345 exam bundle plus a $370 application fee that includes the General Principles Review Manual, and renew annually with 6 PDHs and a $160 fee. The exam blueprint weights Management Practices (32-39%) and Documentation, Communication, and Safety (22-27%) most heavily, with smaller portions on permits, inspection duties, monitoring, plan and site management, and hydrology.

Sample CESSWI Practice Questions

Try these sample questions to test your CESSWI exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under EPA 40 CFR Part 122, which federal permit program regulates stormwater discharges from most construction sites that disturb one or more acres?
A.NEPA Construction Permit
B.NPDES Construction General Permit (CGP)
C.Clean Air Act 112 permit
D.RCRA Subtitle D permit
Explanation: The NPDES Construction General Permit (CGP) implements the Clean Water Act requirement to control stormwater discharges from construction activities disturbing one or more acres (or less if part of a larger common plan). Operators must obtain CGP coverage before discharging.
2Which document is the primary site-specific plan that a CESSWI typically inspects against on a construction project?
A.Spill Prevention, Control, and Countermeasure (SPCC) plan
B.Stormwater Pollution Prevention Plan (SWPPP)
C.OSHA Written Hazard Communication Plan
D.Fire Protection Plan
Explanation: The SWPPP is the site-specific plan required by the NPDES Construction General Permit. It identifies pollutant sources and the BMPs selected to control them, and an inspector verifies that installed BMPs match the SWPPP.
3Under the 2022 EPA Construction General Permit, what is the baseline routine inspection frequency for a typical active construction site?
A.At least once every 30 days
B.At least once every 14 days
C.At least once every 7 days, OR at least once every 14 days plus after qualifying rain events
D.Only after every rain event
Explanation: EPA's 2022 CGP allows operators to choose between inspecting at least every 7 calendar days OR at least every 14 calendar days plus within 24 hours of a qualifying storm event. The qualifying rain threshold is 0.25 inch in 24 hours.
4EPA's 2022 CGP defines a qualifying storm event that can trigger a post-storm inspection as a rain event producing at least what depth within 24 hours?
A.0.10 inch
B.0.25 inch
C.0.50 inch
D.1.00 inch
Explanation: The 2022 CGP defines a qualifying storm event as 0.25 inch or greater of rainfall in 24 hours. A post-storm inspection is then required within 24 hours of the end of that event under the 14-day-plus-storm option.
5Under the CGP, within how many days after identifying a BMP deficiency must the operator complete corrective action, unless infeasible?
A.Immediately, within the same work shift whenever possible, and generally within 7 calendar days
B.Within 30 calendar days
C.Within 90 calendar days
D.By the next annual report
Explanation: CGP corrective actions must be initiated immediately and completed as soon as possible, with a general outside limit of 7 calendar days. Delays beyond 7 days must be documented with a written explanation and a revised schedule.
6Who is ultimately legally responsible for compliance with the NPDES Construction General Permit on a construction site?
A.The CESSWI inspector
B.The Notice of Intent (NOI) operator(s) identified on the permit
C.EPA staff
D.The equipment rental supplier
Explanation: Legal responsibility rests with the operator(s) listed on the Notice of Intent, typically the owner and/or general contractor that has operational control over the site. Inspectors document conditions; they do not transfer the legal obligation from the permittee.
7An MS4 permit regulates which of the following?
A.Stormwater discharges from a municipal separate storm sewer system owned by a local jurisdiction
B.Discharges from industrial process wastewater only
C.Drinking water treatment plant effluent
D.Landfill leachate
Explanation: An MS4 (Municipal Separate Storm Sewer System) permit covers stormwater that a municipality or similar entity conveys to waters of the U.S. Construction sites discharging to an MS4 must meet both CGP and the receiving MS4's requirements.
8Turbidity is commonly measured and reported in which unit on construction sites?
A.Milligrams per liter (mg/L)
B.Nephelometric Turbidity Units (NTU)
C.Parts per billion (ppb)
D.Gallons per minute (gpm)
Explanation: Turbidity is measured in NTU using a nephelometer, which shines a light through a water sample and measures the scattered light at 90 degrees. NTU is the standard unit in EPA Method 180.1 and Standard Methods.
9A CESSWI inspector collects a discharge sample for a site that requires chain-of-custody documentation. Which of the following is MOST important for chain-of-custody?
A.Each person who handles the sample is identified with date and time
B.The sample is kept at room temperature at all times
C.The sample bottle can be opened by any worker on site
D.The label can be omitted to save time
Explanation: Chain-of-custody requires that every transfer of a sample be documented with the handler's name, date, and time. That creates a defensible record proving the sample was not altered or tampered with between collection and analysis.
10Which federal agency issues the baseline Construction General Permit used in states where EPA is the NPDES permitting authority?
A.OSHA
B.USDA Natural Resources Conservation Service
C.US Environmental Protection Agency (EPA)
D.US Army Corps of Engineers
Explanation: EPA issues the federal Construction General Permit under Clean Water Act authority for states, territories, and tribes where EPA remains the NPDES permitting authority. Most states have been authorized to run their own equivalent programs.

About the CESSWI Exam

CESSWI is EnviroCert's national professional certification for inspectors who perform construction-site erosion, sediment, and stormwater inspections consistent with EPA's NPDES Construction General Permit definition of Qualified Personnel. The program covers rules and regulations, soils and hydrology, permits, inspection fundamentals and duties, monitoring and sampling, documentation and safety, plan and site management, and management practices (BMPs).

Assessment

Two sections (up to 100-120 questions each), 90 minutes per section

Time Limit

Up to 4-5 hours across both sections depending on candidate track

Passing Score

70% or higher on each section

Exam Fee

$345 Prometric bundle plus $370 application fee (includes General Principles Review Manual) (EnviroCert International, Inc. (ECI) / Prometric)

CESSWI Exam Content Outline

32-39%

Management Practices (BMPs)

Silt fence, sediment basins and traps, rock check dams, inlet protection, fiber rolls/wattles, erosion control blankets, turbidity curtains, diversions, level spreaders, bioretention, rip-rap, construction entrances, dust control, and good housekeeping practices.

22-27%

Documentation, Communication, and Safety

Corrective-action records, inspection reports and certifications, photo documentation, spill response, SDS awareness, PPE, excavation safety, difficult-communication techniques, and preconstruction meeting roles.

12-15%

Inspection Fundamentals and Duties

Outfall-first inspections, tributary area evaluation, drainage and flow tracing, partial stabilization, qualified personnel responsibilities, and inspector authority versus the engineer/owner.

9-11%

Plan and Site Management

SWPPP contents and amendments, ESCP vs SWPPP distinctions, site maps, construction sequencing, buffers, and SWPPP availability requirements.

7-9%

Inspection Elements for Construction

Construction entrance inspection, perimeter control repair, final stabilization verification before Notice of Termination, and BMP substitution procedures.

4-6%

General Permits and Rules

NPDES CGP inspection frequency (7-day or 14-day + storm), 0.25 inch qualifying storm trigger, 7-day corrective-action completion, TMDL/303(d) waters, buffer requirements, and ESA considerations.

1-3%

Monitoring and Sampling

Turbidity (NTU) measurement, sample collection and chain of custody, discharge monitoring, and TMDL-driven numeric limits.

1-2%

Hydrology and Drainage Principles

Hydrologic soil groups, curve numbers, time of concentration, sheet flow, rainfall erosivity (R factor), and the hydrologic cycle basics.

How to Pass the CESSWI Exam

What You Need to Know

  • Passing score: 70% or higher on each section
  • Assessment: Two sections (up to 100-120 questions each), 90 minutes per section
  • Time limit: Up to 4-5 hours across both sections depending on candidate track
  • Exam fee: $345 Prometric bundle plus $370 application fee (includes General Principles Review Manual)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

CESSWI Study Tips from Top Performers

1Memorize the CGP inspection triggers (7-day OR 14-day + 0.25 inch rain) and the 7-day corrective-action completion rule before exam day.
2Learn the hierarchy of erosion versus sediment controls and know common examples of each so you can classify BMPs at a glance.
3Drill silt fence, sediment basin, inlet protection, and construction entrance details because management practices alone are one-third of the exam.
4Practice documenting a BMP deficiency with the 5 Ws: what, where, who, when fixed, and what corrective action was applied.
5Study UPC and EPA terminology precisely (WSFU vs DFU for plumbing does not apply, but CGP terms like outfall, operator, and SWPPP must be exact).
6Understand buffer requirements (50 ft) and ESA/TMDL triggers because those show up in rules and regulations questions.
7Review solid safety fundamentals: OSHA 29 CFR 1926 Subpart P excavation, PPE, and SDS location procedures.
8Time the second half of the exam as carefully as the first; candidates often rush the final management-practice block and lose easy points.

Frequently Asked Questions

What is the CESSWI exam format and passing score?

The CESSWI exam is administered through Prometric in two sections. Each section can contain between 100 and 120 questions and requires a score of 70% or higher to pass, with 90 minutes allowed per section. It is a closed-book professional certification exam, not open book.

How much does the CESSWI exam cost in 2026?

EnviroCert's current fees list the CESSWI Prometric exam bundle at $345, plus a $370 application review fee that includes the digital General Principles Review Manual. The retest fee is $205 and annual renewal is $160 for full CESSWI status.

What are the CESSWI experience and education requirements?

CESSWI is designed for experienced construction-site inspectors. EnviroCert reviews qualifying degrees (science, planning, or construction management) and/or professional licensure plus relevant work experience. Non-qualifying degrees receive half credit, and experience requirements are documented in the application review.

Is the CESSWI exam open book?

No. EnviroCert's FAQ states that Professional Certification Exams and Certificate of Training Exams are not open book. Candidates should master the CESSWI General Principles Review Manual and NPDES Construction General Permit concepts before testing.

What is on the CESSWI exam blueprint?

EnviroCert's 2024 Job Task Analysis weights the exam with Management Practices at 32-39%, Documentation, Communication, and Safety at 22-27%, Inspection Fundamentals and Duties at 12-15%, Plan and Site Management at 9-11%, Inspection Elements for Construction at 7-9%, General Permits at 4-6%, and smaller shares for Monitoring and Sampling and Hydrology.

How is CESSWI renewed?

CESSWI renews annually. The full CESSWI status requires 6 Professional Development Hours (PDHs) each certification year and an annual renewal fee of $160. CESSWI-IT (In Training) requires 3 PDHs each year at a lower renewal fee.

Does CESSWI satisfy state Qualified Personnel requirements?

CESSWI is widely accepted or referenced by state NPDES programs as meeting EPA's Qualified Personnel definition under the Construction General Permit. Specific state acceptance varies; candidates should verify with their state or MS4 permit authority.

What types of inspections does a CESSWI perform?

A CESSWI performs routine and post-storm NPDES CGP inspections, SWPPP reviews, BMP installation and maintenance inspections, corrective-action documentation, and final stabilization verifications prior to Notice of Termination.