CPI Pass Rate 2026: What the Data Shows

The Pass Rate Question: What Is and Isn't Published

Search for the Certified Pump Installer pass rate and you will find plenty of confident-sounding numbers. Here is the honest picture: the National Ground Water Association, which governs the credential, does not publish a pass-rate figure on its certification-exam page, in its Exam Preparation Success Guide, or in its eligibility and FAQ materials. Testing is delivered through PSI Services, and candidates receive results immediately, but neither organization releases aggregate pass statistics in the materials we reviewed.

That matters because a number with no source is worse than no number. Candidates who read an invented "78% pass rate" may under-prepare, while those who read an invented "40% pass rate" may talk themselves out of trying. This article takes a different approach: instead of guessing at a statistic, it shows you what the published exam mechanics imply about difficulty, where the real risk concentrates, and how to prepare accordingly. For a broader look at difficulty, see our complete CPI difficulty guide.

What "Passing" Actually Means for Pump Installers

Because there is no published pass rate, the most useful thing you can do is understand the pass standard itself. For the Certified Pump Installer route, each examination carries a 70% passing standard on a 50-question test. In practical terms, that means you need at least 35 correct answers and can miss as many as 15. Our dedicated CPI passing score article goes deeper on how that threshold works.

Two features make "passing" more nuanced here than in a single-exam credential:

• You must pass more than one exam. The complete route requires the Water systems general exam plus at least one specialty exam. A strong General score does not carry a weak specialty score.
• The exams must be passed within one 12-month period. Passing the General exam starts a clock for the specialty exam, so scheduling discipline is part of the pass equation.

Format and Mechanics That Shape Your Odds

The delivery format influences how candidates perform as much as the content does. Here is what is documented:

Note that the minimum route is not one 100-question marathon. It is two distinct sittings, each with its own 50-question set and its own 60-minute clock. Closed-book delivery means you cannot lean on a printed reference, which is why memorizing sizing relationships, safety rules, and troubleshooting logic matters. If you are mapping out testing logistics, our exam dates and scheduling guide covers the year-round testing model.

Sixty minutes for 50 questions works out to roughly 72 seconds per question. That is comfortable for a candidate who knows pump systems from the field and tight for someone reasoning every item from scratch.

Where Candidates Lose Points: The Seven Duty Areas

NGWA's DACUM Research Chart for Pump Installers (developed June 12-13, 2003, and linked from the current certification-exam page) lays out seven occupational-duty headings. It is important to be precise about what these are: they are preparation and job-task competencies, not an official exam blueprint. NGWA does not publish percentage weights for them in the retrieved preparation sources, and the 2019 Exam Preparation Success Guide organizes study into six preparation categories rather than seven, omitting the administrative duty. So treat the list below as a map of the job, not a guarantee of how many questions each area contributes to any given exam. For a fuller walkthrough, see our guide to all seven content areas.

General Exam vs. Exam K vs. Exam L

Your odds depend partly on which specialty you choose. Every candidate takes the Water systems general exam. Then you add at least one specialty:

• Exam K: Water systems less than 100 gpm
• Exam L: Water systems more than 100 gpm

The practical advice is to choose the specialty that matches the systems you actually work on. A residential and light-agricultural installer who spends most days around smaller systems will usually find Exam K closer to daily experience, while an installer working on larger municipal, irrigation, or commercial pumping will find Exam L more familiar. Picking a specialty outside your daily work adds avoidable risk. Our CPI study guide covers how to match preparation to the track you select.

Retake Economics and the 12-Month Window

At US$75 per exam, a single failed attempt is not financially catastrophic, but it does add up and it eats into your calendar. The minimum route costs US$150 in exam fees if you pass both exams on the first try. Each retake adds another US$75 for the exam you repeat. The sources reviewed did not give a detailed retake-waiting-period policy, so confirm current retake rules with NGWA or PSI when you schedule rather than relying on a forum post.

The bigger constraint is time. The required exams must be passed within one 12-month period, and certification enrollment must be completed within 12 months of passing the qualifying examination. Plan your sequence so that a failed sitting leaves room for a second attempt inside the window. See our certification cost breakdown for the full picture, remembering that exam fees are not an all-in certification price.

Why Field Experience Is Your Real Pass-Rate Lever

One reason the exam may feel more approachable to working installers than to outsiders is the eligibility gate. Before you can pursue certification, NGWA requires:

• At least 20 years of age
• 24 consecutive months of full-time drilling and/or pump-installation experience
• Two written professional references from people unaffiliated with your current employer
• A completed application, a signed certification agreement, and the required affidavit of legal standing

NGWA membership is not required. In effect, the candidate pool is pre-filtered toward people who already work with pumps, which is a major reason published difficulty impressions come from practitioners rather than novices. Read the details in our CPI requirements article.

A Domain-Ordered Prep Sequence

Rather than a generic schedule, order your preparation around how the seven duty areas build on one another and where experienced installers typically have gaps. Adjust the pacing to your exam date and confirm your scope against NGWA's current preparation guide.

Use the CPI practice tests to simulate the 50-question, 60-minute format, and keep our one-page review sheet handy for last-minute fact checks.

After You Pass: Enrollment and Renewal

Passing the exams is not the finish line. Certification enrollment must be completed within 12 months of passing the qualifying examination. CPI is an individual certification, not a company certification and not a substitute for a state license, so check what your state requires separately.

Annual maintenance requires seven continuing education points (CEPs), a renewal fee, and an affidavit addressing professional standing and required licensure. CEPs should not be relabeled as seven classroom hours. The initial certificate expires December 31 of the year following certification, and newly certified individuals earn and report their first CEPs in that following year.

For the career side of the equation, see our analyses of earnings and whether the credential is worth it.

Frequently Asked Questions

If you want a clearer sense of your own readiness than any aggregate statistic can give, work through timed sets on the CPI Exam Prep practice test site and use your own scores to decide when to book your sitting.