CPD Cheat Sheet 2026

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

1. Which of the following best describes a key competency required for project scheduling & resource management in CPD certification? → Critical thinking and evidence-based decision making
2. What is the purpose of a P-trap in a sanitary drainage system? → Maintain a water seal to block sewer gases
3. Bonding of CSST (corrugated stainless steel tubing) gas piping is required primarily to protect against: → Lightning-induced electrical surges that can perforate the tubing
4. Which pipe material is most commonly specified for underground storm drainage piping on US commercial sites? → Reinforced concrete pipe (RCP) or high-density polyethylene (HDPE)
5. Why is water supply and distribution design critical in plumbing systems? → To manage water flow, pressure, and prevent contamination
6. What is the significance of peer review in materials science & specifications for CPD professionals? → It promotes accountability, knowledge sharing, and quality improvement
7. What is a common challenge professionals face when applying quality control & inspection methods principles in Certified Plumbing Designer? → Balancing theoretical knowledge with practical application
8. Which regulatory body enforces plumbing code compliance on federally owned buildings and military installations? → Federal authority having jurisdiction (AHJ)
9. A hydropneumatic tank in a water supply system is used to: → Store pressurized water and reduce pump cycling
10. Which hydraulic method is most commonly used to size storm drainage piping in the US? → Manning's equation for open-channel flow
11. Which of the following best describes a key competency required for quality control & inspection methods in CPD certification? → Critical thinking and evidence-based decision making
12. Which documentation practice is most important for project scheduling & resource management in the CPD field? → Maintaining complete, accurate, and timely records
13. Which of the following scenarios requires an indirect waste connection rather than a direct drain connection? → A commercial dishwasher in a restaurant kitchen
14. The developed length rule for horizontal drain pipes states that a cleanout must be provided every: → 100 feet
15. A building drain that receives the discharge from a grease interceptor must be sized based on: → Only the interceptor's rated flow in GPM converted to DFUs
16. How should a CPD professional handle a situation where project scheduling & resource management protocols conflict with practical constraints? → Document the conflict and seek guidance from appropriate authorities
17. ASTM B88 is the material standard for which type of pipe commonly used in plumbing systems? → Copper water tube
18. ASSE 1070 establishes performance requirements for which type of device? → Thermostatic mixing valves for individual fixture use
19. What is the primary purpose of plumbing systems design? → To ensure water and waste management efficiency, safety, and reliability
20. Which standard establishes requirements for pressure vacuum breakers (PVBs) used in irrigation systems? → ASSE 1020
21. Which of the following is the correct location for the required cleanout at the base of a sanitary stack? → At the connection of the stack to the building drain
22. When implementing safety regulations & osha compliance practices, what should a CPD professional prioritize first? → Compliance with established standards and protocols
23. Under the IPC, a sanitary drainage system discharging into a public sewer requires what minimum grade for a 4-inch horizontal drain? → 1/8 inch per foot
24. Which ASSE standard applies to the performance of reduced pressure principle backflow preventers? → ASSE 1013
25. What is the primary reason for installing a thermal expansion tank on a closed water heater system with a PRV? → To absorb pressure buildup from thermal expansion of heated water
26. Which code body adopts and publishes the Uniform Plumbing Code (UPC)? → IAPMO
27. What ASTM standard covers copper water tube Type L used in plumbing systems? → ASTM B88
28. Which quality improvement method is most applicable to quality control & inspection methods in Certified Plumbing Designer? → Plan-Do-Check-Act (PDCA) continuous improvement cycle
29. Which technology trend is most likely to impact materials science & specifications in the CPD field in coming years? → Digital tools for enhanced data collection, analysis, and reporting
30. What is 'impervious cover' and why is it significant to a CPD designing site utilities? → Hard surfaces like pavement that do not absorb rainfall, increasing runoff volume and rate