CSM Cheat Sheet 2026

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

1. What is base flow in a stream? → Groundwater contribution to stream flow
2. What is the most important principle in professional Certified Stormwater Manager practice? → Maintaining competence through continuous learning and adherence to standards
3. What is hydrology the study of? → Water movement and distribution
4. What is the significance of professional networking in the Certified Stormwater Manager field? → It facilitates knowledge exchange, referrals, and collaborative problem-solving
5. What is the goal of erosion control in construction sites? → To prevent soil loss and pollution
6. How should a Certified Stormwater Manager professional handle situations beyond their expertise? → Refer to a qualified specialist and communicate transparently with the client
7. What is a watershed? → A land area draining into a water body
8. What is infiltration? → Water soaking into the soil
9. How should a Certified Stormwater Manager professional handle situations beyond their expertise? → Refer to a qualified specialist and communicate transparently with the client
10. Why is watershed management important? → To support water quality and ecosystems
11. Which of the following entities is NOT typically subject to IDDE inspections by an MS4 operator? → Federally owned facilities with their own stormwater permits
12. What is the primary purpose of installing check dams in a drainage channel or swale? → To reduce flow velocity and allow sediment to deposit upstream of the dam
13. What should a practitioner do when regulations conflict with employer policies? → Follow the regulation, as legal requirements supersede employer policies
14. Which water quality indicator is most commonly used in field screening to detect the presence of sanitary sewage contamination in stormwater outfall flows? → Fecal coliform or E. coli bacteria
15. Why is trend analysis valuable in monitoring? → It reveals patterns that predict future issues before they become critical
16. What is the maximum recommended drainage area for a standard silt fence installation? → 0.25 acres per 100 feet of fence
17. How should a Certified Stormwater Manager professional handle situations beyond their expertise? → Refer to a qualified specialist and communicate transparently with the client
18. What is infiltration used for in BMPs? → To allow water to enter the soil
19. Which documentation practice best supports legal defensibility? → Objective, factual entries with specific measurements and timestamps
20. What should be included in an inspection report? → Conditions, BMP status, and actions
21. Which material is most commonly used as a stabilized construction entrance to reduce tracking of mud onto public roads? → Crushed stone or gravel pad
22. What is the most important principle in professional Certified Stormwater Manager practice? → Maintaining competence through continuous learning and adherence to standards
23. What is the first critical step in establishing a municipal IDDE program? → Creating and maintaining a complete map of the storm sewer system
24. Why are Best Management Practices (BMPs) used in stormwater management? → To control and reduce stormwater pollution
25. What should be done immediately after a needlestick injury? → Wash the area, report the incident, and seek medical evaluation
26. Why is BMP design tailored to each site? → To match site-specific conditions
27. What is the function of a sediment basin on a construction site? → To collect and detain runoff so sediment can settle before discharge
28. Which temporary erosion control practice is most appropriate for stabilizing steep disturbed slopes during construction? → Hydroseeding with tackifier
29. How should Certified Stormwater Manager professionals approach quality improvement? → Through systematic evaluation of outcomes and implementation of evidence-based changes
30. What is the correct order for donning personal protective equipment? → Gown, mask, eye protection, gloves