- What CWD Training Actually Covers
- The Two-Exam Pathway You Are Training For
- Field Experience: The Training You Cannot Skip
- Training Map: The Six General Drilling Domains
- Choosing and Training for a Drilling Specialty
- Exam Format and Testing-Day Mechanics
- Sample Practice Questions With Explanations
- Sequencing Your Preparation Around the 12-Month Window
- NGWA Certification vs. State Licensing
- After You Pass: Renewal and Continuing Education
- Frequently Asked Questions
- CWD means Certified Well Driller: General Drilling plus at least one drilling-method specialty, each passed with 70% or higher within 12 months.
- General Drilling alone does not confer CWD; you need a second, specialty exam on top of it.
- Eligibility requires 24 consecutive months of full-time drilling or pump-installation experience, so field time is the first training requirement.
- General Drilling has 50 questions in 60 minutes; Construct Water Well carries the most items, with 16.
What CWD Training Actually Covers
When people search for "CWD training," they often expect a single course or classroom program. For the Certified Well Driller credential offered through the National Ground Water Association (NGWA), the reality is different. Training is a blend of three things: documented hands-on drilling experience, structured exam preparation against the published General Drilling content outline, and focused study for one drilling-method specialty exam.
This article is about the Certified Well Driller credential specifically, the voluntary NGWA contractor certification for water well drillers. If you are still orienting yourself, our explainers on what CWD certification is and what CWD stands for cover the basics before you commit to a training plan.
The Two-Exam Pathway You Are Training For
The most important structural fact about CWD is that it requires two passing results. A candidate must pass General Drilling and at least one drilling-method specialty exam, both within the same 12-month period, with at least 70% on each. Passing General Drilling alone does not confer CWD. Planning your training around only the General Drilling outline is the most common way to end up with half a credential.
| Component | What It Is | Key Facts |
|---|---|---|
| General Drilling | Core exam covering six formal objective areas | 50 multiple-choice questions in 60 minutes; 70% required |
| Drilling specialty exam | Method-specific exam (at least one required) | Normally 50 questions; Exam M, Augering and monitoring, has 75; 70% required |
| Timing rule | Both exams in the same 12-month period | Pass both within the window or the pathway is incomplete |
Because each exam carries a published fee of $75 for members and nonmembers alike, two first-attempt exams cost at least $150. That figure is only the examination fees; it is not an all-inclusive budget, and nonmembers are warned of a separate certification-application fee whose amount the bulletin does not state. For a fuller picture, see our CWD certification cost breakdown.
Field Experience: The Training You Cannot Skip
Before exam preparation even matters, you must meet the eligibility requirements. These are the real front end of CWD training, because they determine whether your application is accepted:
- Age: 20 or older.
- Experience: 24 consecutive months of full-time drilling or pump-installation experience.
- References: two written professional references, neither affiliated with your current employer.
- Paperwork: the required agreement and a current-year affidavit.
- Timing: application materials must arrive within 12 months of the qualifying examination session.
The "consecutive" and "full-time" language matters. If you are early in your career, treat your daily rig work as deliberate training: ask to rotate through mobilization, casing and grouting, development, and demobilization tasks so that every General Drilling domain has a real-world anchor in your memory. Our CWD requirements guide walks through the eligibility details more fully.
Key Takeaway
Line up your two unaffiliated references early. Candidates often discover late that an employer-affiliated reference does not satisfy the requirement, and the 12-month application window leaves little room to recover.
Training Map: The Six General Drilling Domains
The General Drilling content outline organizes the exam into six components. The published item allocations are 10, 16, 5, 11, 3, and 5 questions respectively. These are item counts, not percentage weights, so allocate study time using them as a guide to relative emphasis rather than a precise formula. The six headings are the formal General Drilling exam objectives; they are not a complete blueprint for the additional specialty exam you must also pass. For a deeper dive into each area, see our complete guide to the CWD exam domains.
Domain 1: Mobilize for the Site (10 items)
Everything that happens before the bit touches ground: planning, site assessment, equipment readiness, and safe setup.
- Site evaluation and hazard recognition before moving equipment in
- Utility and access considerations
- Matching rig and tooling to the planned well
Domain 2: Construct Water Well (16 items)
The heaviest allocation and the core of the exam. Expect the most scenario-style questions here.
- Borehole advancement and drilling fluid concepts
- Casing, screen, and filter-pack selection and placement
- Annular sealing and grouting practices
- Protecting the aquifer from contamination during construction
Domain 3: Rehabilitate Wells (5 items)
Restoring performance in existing wells.
- Recognizing causes of declining yield or water quality problems
- Choosing appropriate rehabilitation approaches
Domain 4: Develop Wells (11 items)
The second-largest allocation after construction. Development readies a completed well for reliable production.
- Purpose of development and signs it is complete
- Common development methods and when each fits
- Removing fines and drilling-fluid residue near the borehole wall
Domain 5: Decommission Wells (3 items)
Permanent closure so a well cannot become a contamination pathway.
- Why abandoned wells are a risk
- Sealing principles and documentation
Domain 6: Demobilize the Site (5 items)
Finishing responsibly after the work is done.
- Site restoration and cleanup
- Handling and disposal of cuttings and fluids
- Final documentation and equipment removal
Notice the shape of the exam: Construct Water Well (16) and Develop Wells (11) together account for 27 of the 50 questions, and adding Mobilize for the Site (10) brings the total to 37. Decommissioning, at 3 items, is the smallest allocation, but a short domain is not a safe one to ignore, since a few missed items still cost you against a 70% threshold.
Choosing and Training for a Drilling Specialty
The second exam is where candidates differ most. Drilling specialty exams are method-specific, normally 50 questions each, except Exam M (Augering and monitoring), which has 75. You must pass at least one. Pick the specialty that matches the method you actually practice, because the exam rewards operational familiarity that cannot be crammed.
How to Pick
- Match your daily work. If you run one primary method on your rig, that is almost always your best first specialty.
- Check the bulletin outline. Read the candidate information bulletin's description of your chosen specialty before committing, since the General Drilling study resources do not map to specialty content.
- Respect the longer exam. If you pursue Exam M, plan for 75 questions rather than 50 and budget stamina and pacing accordingly.
- Mind the 12-month window. A specialty you can prepare for quickly keeps your two passing results inside the required period.
Exam Format and Testing-Day Mechanics
PSI Services administers the exams as closed-book, computer-based tests at proctored centers. Several mechanics are worth rehearsing during training so nothing surprises you:
- Closed book: no reference materials in the room.
- Calculator: a nonprinting, nonprogrammable calculator without an alphabetical keypad is permitted.
- Scratch paper: supplied by the center and collected afterward.
- Pacing: General Drilling gives you 60 minutes for 50 questions, a little over a minute per item.
Practice with the same type of basic calculator you will bring, and get comfortable doing volume, flow, and annular-space arithmetic on scratch paper. For help understanding how demanding the exam really is, read how hard the CWD exam is, and see the CWD passing score explainer for what the 70% requirement means in practice. Note that 70% is the required score on each exam, not a pass rate; no current aggregate pass rate has been verified, as discussed in our CWD pass rate article.
Sample Practice Questions With Explanations
The following original questions are mapped to the General Drilling domains. They illustrate the style of reasoning the exam rewards; use them to test understanding, not to memorize answers. For a full bank, visit the CWD practice test.
Practice Question 1 (Mobilize for the Site)
Before moving a rig onto a new location, which action most directly reduces the risk of a serious incident?
- A. Ordering extra drilling fluid additives
- B. Identifying overhead and underground utilities and planning the rig setup around them
- C. Scheduling the final site cleanup
- D. Selecting the well screen slot size
Answer: B. Utility and hazard identification is a pre-mobilization safety step. The other options belong to later phases (fluids, cleanup, and screen design) and do not address the immediate site hazard.
Practice Question 2 (Construct Water Well)
What is the primary purpose of placing an annular seal around the upper portion of a well casing?
- A. To increase the well's pumping rate
- B. To reduce casing weight
- C. To prevent surface water and shallow contaminants from migrating down the borehole
- D. To make development unnecessary
Answer: C. The annular seal blocks the borehole annulus as a pathway for contamination. It does not affect yield directly and does not replace development.
Practice Question 3 (Develop Wells)
Which outcome indicates that well development is progressing as intended?
- A. Water becomes progressively clearer with less sediment over time
- B. Water becomes progressively more turbid
- C. Water level in the well stops responding entirely
- D. Drilling fluid is added to the borehole
Answer: A. Development removes fines and residue near the borehole wall, so discharge generally clears as the process works. Increasing turbidity or adding fluid runs opposite to the goal.
Practice Question 4 (Decommission Wells)
Why is proper decommissioning of an abandoned well important?
- A. It prevents the open borehole from serving as a conduit for contamination to reach groundwater
- B. It increases the value of the casing material
- C. It eliminates the need for site documentation
- D. It allows the well to be redeveloped later without cost
Answer: A. An unsealed well can channel surface contaminants to an aquifer. Documentation is part of proper decommissioning, not something it removes.
Sequencing Your Preparation Around the 12-Month Window
Generic study methods matter far less than sequencing, and sequencing is driven by the CWD pathway. Because both exams must fall in the same 12-month period and your application materials must arrive within 12 months of the qualifying session, build your calendar backward from that window. Our CWD study guide and exam dates article cover scheduling in more depth. A workable domain-first sequence looks like this:
Construct Water Well
- Start with the largest allocation (16 items) while your energy is highest
- Work through casing, screen, filter pack, and sealing scenarios
Develop Wells and Mobilize for the Site
- Cover the next two largest allocations (11 and 10 items)
- Tie development methods to the wells you have actually completed
Rehabilitate, Decommission, and Demobilize
- Cover the three smallest domains (5, 3, and 5 items) in a single focused week
- Drill the sealing and documentation concepts that recur across them
Specialty Exam Preparation
- Switch to method-specific references for your chosen specialty
- Take timed practice sessions at the 60-minute pace
Use the CWD cheat sheet for a final review pass in the days before each exam.
NGWA Certification vs. State Licensing
A frequent point of confusion in training is whether CWD replaces a state license. It does not. CWD is a voluntary NGWA certification; state licensing is a separate, jurisdiction-specific matter. Renewal even requires compliance with licensing requirements, so the two interact, but one does not substitute for the other.
| Feature | NGWA Certified Well Driller | State Licensing |
|---|---|---|
| Nature | Voluntary professional certification | Set by individual state or jurisdiction |
| Issuer | National Ground Water Association | State authority |
| Requirements | Two exams, 24 months of experience, references, affidavit | Varies by state |
| Role in your career | Demonstrates verified knowledge and experience | May be required to legally operate |
Check your own state's rules separately. To think through the career side, see our analyses of whether the CWD certification is worth it, the CWD salary guide, and CWD jobs.
After You Pass: Renewal and Continuing Education
Training does not end on exam day. Renewal is annual and requires seven continuing education points (CEPs), an affidavit, applicable fees, and compliance with licensing requirements. The stated renewal due date is December 31. The currently linked 2027 renewal form lists $50 for members and $150 for nonmembers; these are renewal fees, not examination fees.
Treat CEPs as an ongoing training habit: log qualifying activities throughout the year instead of scrambling in December.
Frequently Asked Questions
The published requirements center on experience and passing exams rather than a mandated course. You need 24 consecutive months of full-time drilling or pump-installation experience, two unaffiliated references, the required agreement, a current-year affidavit, and passing results on General Drilling and one specialty exam.
No. General Drilling alone does not confer CWD. You must also pass at least one drilling-method specialty exam, with both passed within the same 12-month period at 70% or higher on each.
General Drilling has 50 multiple-choice questions in 60 minutes. Drilling specialty exams normally have 50 questions, while Exam M, Augering and monitoring, has 75.
The published fee is $75 per examination for members and nonmembers, so two first-attempt exams cost at least $150. This excludes other costs, and nonmembers face a separate certification-application fee whose amount is not stated in the bulletin.
Construct Water Well, which carries the largest published allocation at 16 items. Develop Wells (11) and Mobilize for the Site (10) follow, with the remaining three domains making up the smaller allocations.
For further orientation on the credential itself, you can also explore our CWD training resources and the what is CWD overview, then put your preparation to the test with the CWD practice questions.