CPESC Cheat Sheet 2026

The 30 highest-yield CPESC facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which skill is most critical for effective stormwater management? → Communication and stakeholder engagement
2. A check dam constructed with rock riprap in a drainage swale is designed primarily to: → Reduce flow velocity and trap sediment behind the structure
3. What is the significance of the 'credible soil loss tolerance' (T value) in erosion control planning? → Maximum annual soil loss rate at which soil productivity can be maintained indefinitely
4. The unit peak discharge (qu) used in the TR-55 graphical peak discharge method is expressed in units of: → Cubic feet per second per inch of runoff per square mile (csm/in)
5. A CPESC inspector finds that a subcontractor has begun grading in an area not covered by the current SWPPP. What is the correct response? → Direct the subcontractor to stop work in that area and update the SWPPP before resuming
6. What stormwater management practice involves routing runoff through a shallow, vegetated channel to promote infiltration and filtering? → Dry swale
7. The 'dispersivity' of a soil refers to its tendency to: → Break apart and disperse in water without mechanical agitation
8. In CPESC practice, what is the primary purpose of strategic planning? → To align resources with goals and anticipate challenges
9. What is the primary purpose of a sediment basin as compared to a sediment trap? → Sediment basins provide greater storage volume for larger drainage areas
10. When must a Pollution Prevention Plan (PPP) specifically address BMP maintenance schedules? → At the time of plan development and updated after each inspection
11. What is the primary purpose of a stabilized construction entrance/exit? → To reduce the tracking of sediment onto public roads by vehicles leaving the site
12. When evaluating a site for potential groundwater contamination risk during construction, which site feature is most significant? → Shallow water table within 5 feet of the surface
13. Which professional attribute is most valued in inspection procedures within the CPESC field? → Accountability and commitment to standards
14. Which type of soil map unit description is most useful when planning erosion control BMPs for a construction site? → Erodibility (K value), slope range, and drainage class
15. What is the PRIMARY purpose of obtaining CPESC certification in Certified Professional in Erosion and Sediment Control? → To demonstrate verified competency and adherence to professional standards
16. What is the key benefit of evidence-based decision making in CPESC management? → It improves accuracy and reduces bias in decisions
17. Which law regulates water quality and sediment discharge in the United States? → The Clean Water Act (CWA)
18. Which professional attribute is most valued in water quality standards within the CPESC field? → Accountability and commitment to standards
19. A construction project disturbs 3.5 acres and discharges to a 303(d)-listed impaired water body. Under the EPA CGP, this project is classified as: → A Category 2 site requiring benchmark monitoring
20. Which stormwater quality parameter is typically used to assess overall effectiveness of sediment control BMPs at a construction site? → Total Suspended Solids (TSS)
21. What is the most important professional competency for CPESC certification in construction site controls? → Deep knowledge combined with practical application skills
22. What is the most important professional competency for CPESC certification in water quality standards? → Deep knowledge combined with practical application skills
23. In CPESC science preparation, what does homeostasis refer to? → The tendency to maintain stable internal conditions
24. When a construction project crosses state lines, which permitting approach is correct? → Permit coverage must be obtained from each state where land disturbance occurs
25. Which factor in the RUSLE equation accounts for the protective effect of plant cover on soil erosion? → C factor (Cover-management factor)
26. In which situation would you expect soil erodibility (K factor) to be HIGHEST? → Fine sandy loam with low organic matter content
27. What is the PRIMARY purpose of obtaining CPESC certification in Certified Professional in Erosion and Sediment Control? → To demonstrate verified competency and adherence to professional standards
28. Which sediment control practice is best suited for protecting a storm drain inlet on a paved roadway during construction? → Gravel bag or filter sock placed around the inlet grate
29. When installing silt fence on a slope, the bottom of the fence fabric should be: → Folded outward (upstream) and buried at least 6 inches in a trench
30. A soil percolation rate of less than 0.5 inches per hour is generally classified as: → Very slow