CWD Study Guide 2026
Everything you need to pass the CWD exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
CWD exam key facts
- Candidates have one hour to complete each NGWA certification exam. Source
- Candidates must pass both required exams within a 12-month period with scores of 70 percent or better to become certified. Source
- Each Certified Well Driller exam costs $75 regardless of NGWA membership status. Source
- There is no waiting period to retake a failed NGWA certification exam. Source
📋 CWD Exam Format at a Glance
📚 CWD Topics to Study (30)
✍️ Sample CWD Questions & Answers
1. In digital driller's logs, what does 'rate of penetration (ROP)' data help the geologist or driller interpret?
ROP (feet per hour or minute) increases in soft formations and slows in hard rock, providing a continuous indirect indicator of formation changes that helps identify lithologic boundaries.
2. A change order in a well drilling contract is used to:
A change order formally documents and authorizes modifications to the original contract scope, timeline, or cost when unforeseen site conditions or client-requested changes arise during the project.
3. What should a CWD professional do upon discovering a colleague's unethical conduct?
Professionals have an obligation to report misconduct through proper channels while documenting observations to support investigation.
4. How should CWD professionals handle difficult conversations?
Difficult conversations require preparation, emotional control, fact-based discussion, and collaborative problem-solving.
5. When assessing risk from drilling near a septic system, the primary concern is:
Septic systems release pathogens and nitrates that can migrate into the aquifer if minimum setback distances are not maintained.
6. What is informed consent in CWD professional practice?
Informed consent requires clear, complete information about proposed services, risks, outcomes, and alternatives so clients can make knowledgeable decisions.
🎯 Free CWD Practice Tests
📖 CWD Guides & Articles
What Practice Test Geeks adds beyond an AI chat for CWD
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length CWD mock exam — 100 questions in 120 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed CWD question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable CWD cheat sheet you can print or save as a PDF.
- CWD flashcards built from the same question bank.
- Free CWD practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- groundwaterweek.com — Exam dates, registration deadline, exam information · verified Oct 2026
- ngwa.org — Fees, exam format, passing score, score release, test dates, time limit, test delivery, retake policy, eligibility · verified Oct 2026
- test-takers.psiexams.com — Retake fee · verified Oct 2026