CWD Requirements 2026: Eligibility, Prerequisites & How to Qualify

The Two-Exam Pathway: Why General Drilling Alone Is Not Enough

The most common misunderstanding about the Certified Well Driller credential from the National Ground Water Association (NGWA) is that passing one exam earns it. It does not. The credential is built on two layers: the General Drilling examination, and at least one drilling-method specialty examination. Both must be passed within the same 12-month period, and each requires a score of at least 70%.

That structure shapes everything about qualifying. Your eligibility is not just a matter of experience on paper; it is also a matter of timing and sequencing. If you pass General Drilling and let the 12-month period lapse before you pass a specialty, the two results do not combine into a credential. Candidates who treat the first exam as the finish line often discover this the hard way.

The Eligibility Checklist, Item by Item

NGWA's published eligibility rules for Certified Well Driller come down to a short list. Each item has a practical trap worth knowing about.

The wording matters. "Consecutive" and "full-time" are doing real work in the experience requirement, so if your career has included gaps, seasonal layoffs, or a shift between roles, document your timeline carefully before you apply. NGWA maintains the authoritative eligibility and application details on its contractor certification pages, and you should confirm current wording there rather than relying on any secondhand summary, including this one.

Experience and References: Where Applications Stall

What counts as qualifying experience

The requirement is 24 consecutive months of full-time drilling or pump-installation experience. Note that pump installation is named alongside drilling, which matters for candidates whose daily work leans toward pump and system installation rather than rig operation. If your background is mixed, lay out your work history month by month, with employers and responsibilities, so you can show the continuous 24-month stretch without guessing.

The reference rule most people misread

Two written professional references are required, and they must be unaffiliated with your current employer. That excludes the obvious choices: your boss, your crew lead, the owner of the company you work for today. Better candidates include former employers, suppliers, regulators or inspectors you have worked with, or other industry professionals who have watched your work and can speak to it. Line up these references early. A reference letter that takes six weeks to arrive can quietly consume a large part of your 12-month application window.

What You Will Sit For: Format and Rules on Test Day

PSI Services administers the examinations as closed-book, computer-based tests at proctored centers. That means no notes, no reference binders, and no looking things up. Everything you need must be in your head.

• General Drilling: 50 multiple-choice questions in 60 minutes.
• Drilling specialty exams: normally 50 questions each.
• Exam M, Augering and monitoring: 75 questions, the exception to the usual specialty length.
• Passing standard: at least 70% on each examination.
• Calculator: a nonprinting, nonprogrammable calculator without an alphabetical keypad is permitted.
• Scratch paper: supplied at the center and collected afterward.

The calculator rule deserves attention because well drilling involves real arithmetic: volumes, flow, annular space, and material quantities. Bring a compliant calculator, and practice with that exact device so you are not hunting for functions under time pressure. For the scoring standard itself, our guide to the CWD passing score explains how the 70% threshold works in practice, and How Hard Is the CWD Exam? covers what candidates tend to find difficult.

The Six General Drilling Domains and Their Item Counts

The General Drilling content outline lists six formal exam objectives. These are the General Drilling objectives only; they are not a complete blueprint for the additional specialty you must also pass. The published allocations are item counts, not percentage weights, so treat them as a guide to where questions concentrate rather than as exact percentages.

For a deeper walk through each content area, see CWD Exam Domains: Complete Guide to All 6 Content Areas. If you want to test yourself against these areas under exam-style conditions, our CWD practice test maps questions to the same six headings.

Choosing Your Drilling Specialty Exam

Because the CWD requires at least one drilling-method specialty, your choice of specialty is a real decision, not a formality. The practical guidance is to choose the method you work with most. The specialty exam rewards hands-on familiarity, and the six General Drilling headings above do not cover it, so you cannot lean on General Drilling study alone.

• Match your daily work. A candidate who spends most of the year on one drilling method will generally find that exam more intuitive than one outside their experience.
• Check the length. Most specialty exams have 50 questions, but Exam M (Augering and monitoring) has 75, so budget more stamina and time awareness if you choose it.
• Confirm the current list. NGWA publishes the available examinations and current requirements on its certification exams page. Verify the specialties on offer before you commit, rather than assuming a list from memory.
• Remember the shared deadline. Whatever specialty you pick must be passed in the same 12-month period as General Drilling.

Since the specialty content is separate from the six General Drilling objectives, expect to source preparation materials specifically for that method. Our CWD study guide covers how to organize preparation across both exams.

Fees You Can Verify and Fees You Cannot

The published examination fee is $75 per examination, for members and nonmembers alike. With two first-attempt examinations (General Drilling plus one specialty), the examination fees alone come to at least $150. Retakes, additional specialties, and anything beyond the examination fee are on top of that.

Keep exam fees and renewal fees mentally separate. The $50 (member) and $150 (nonmember) amounts on the current renewal form are annual renewal fees, not examination fees. Mixing the two is an easy way to misjudge what the credential costs over time.

Voluntary NGWA Certification vs. State Licensing

Certified Well Driller is a voluntary NGWA credential. It is not the same thing as a state license to drill, and passing the exams does not replace whatever licensing your state or jurisdiction requires. Many drillers hold both: the license that governs where and how they may legally operate, and the NGWA certification that signals tested knowledge to employers and customers.

This distinction matters for qualifying in two ways. First, meeting NGWA's CWD requirements does not satisfy licensing requirements, and vice versa. Second, renewal of the CWD includes compliance with licensing requirements, so the two are linked after you hold the credential even though they are separate systems. Check your state's rules independently of anything in this article.

If you are weighing whether the voluntary credential is worth pursuing alongside licensing, see Is the CWD Certification Worth It? and our CWD salary guide. Candidates interested in where the credential fits in hiring can also browse CWD jobs.

Sequencing Your Preparation Around the 12-Month Window

Rather than a generic study calendar, build your plan around the structure of the credential: one deadline, two exams, six General Drilling domains. Here is one reasonable way to sequence it, weighted by the published item counts.

Adjust the pace to your own schedule, but keep the principle: front-load the heavy domains, finish with timed practice, and leave real room for the specialty exam inside the same 12-month period. For test-day logistics and scheduling, see CWD exam dates and deadlines.

Keeping the Credential: Annual Renewal Basics

Qualifying is only the first step. CWD 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.

One detail deserves caution. The renewal webpage allows receipt through January 31 without a late fee, while the linked 2027 renewal form instructs applicants to add $50 after December 31. Those two statements conflict, so do not count on a grace period. Treat December 31 as your deadline and confirm the applicable rule with NGWA. Planning renewal CEPs across the year, rather than in December, avoids the problem entirely.

Frequently Asked Questions

Qualifying for Certified Well Driller comes down to meeting the experience and reference rules, planning two examinations around one 12-month window, and keeping the paperwork ahead of the clock. When you are ready to test your knowledge across the six General Drilling domains, start with the CWD practice test.