- What CPI Certification Actually Is
- Who Issues It and Who Tests It
- How the Exams Are Structured
- The Seven Job-Duty Areas Behind the Credential
- Eligibility and Application Mechanics
- What the Exams Cost
- Keeping the Credential Current
- Certification Versus a State License
- Who Benefits From Holding It
- Sequencing Your Preparation Around the Duties
- Frequently Asked Questions
- CPI stands for Certified Pump Installer, a voluntary individual credential from the National Ground Water Association (NGWA).
- The minimum route is two exams: the Water systems general exam plus Exam K (under 100 gpm) or Exam L (over 100 gpm).
- Each exam has 50 questions, a 60-minute limit, and a 70% passing standard, with required exams passed within 12 months.
- Exam fees are US$75 per exam for members and non-members alike, so the minimum route costs US$150 in exam fees alone.
What CPI Certification Actually Is
In this context, CPI means Certified Pump Installer. It is a voluntary, individual credential for people who install pumps in water systems, and it is issued through the National Ground Water Association (NGWA). If you have searched the acronym and landed on unrelated credentials that happen to share the same three letters, this article is only about the pump installation certification. For a broader orientation to the acronym itself, see What Is CPI? and What Does CPI Stand For?, but note that everything below concerns the NGWA pump installer credential.
The certification recognizes that a person has met a defined experience standard, supplied professional references, and demonstrated knowledge on proctored, closed-book examinations. It is an individual designation. It does not certify a company, and it does not replace any licensing your state may require.
Who Issues It and Who Tests It
NGWA is the governing body. It sets the eligibility rules, maintains the certification agreement, and handles renewal. The examinations themselves are delivered through PSI Services, a third-party testing provider with computer-based testing centers. NGWA membership is not required to sit for the exams or to become certified, though member status can matter for some fees, as covered below.
Testing is offered year-round at PSI centers, which means you are not locked into a single annual window. Results are available immediately after you finish. If you are trying to plan around scheduling, the CPI exam dates and scheduling guide walks through the practical side of booking a seat.
How the Exams Are Structured
The CPI route is built from separate examinations rather than one single test. Here is the minimum path:
- Water systems general exam (required for everyone).
- At least one specialty exam: Exam K (Water systems less than 100 gpm) or Exam L (Water systems more than 100 gpm).
| Feature | Detail |
|---|---|
| Questions per exam | 50, multiple choice |
| Time limit per exam | 60 minutes |
| Passing standard | 70% |
| Delivery | Computer-based, closed-book, at PSI centers |
| Availability | Year-round |
| Results | Immediate |
| Minimum route totals | 100 questions and two hours, across two separately timed exams |
| Completion window | Required exams passed within one 12-month period |
One point deserves emphasis: the "100 questions and two hours" figure is an aggregate of two separate sittings. It is not a single combined 100-question exam, and it is not an uninterrupted two-hour block. Each exam is timed on its own. For a closer look at what the 70% line means in practice, read the CPI passing score guide.
The Seven Job-Duty Areas Behind the Credential
NGWA publishes a DACUM Research Chart for Pump Installers, developed in June 2003, that breaks the occupation into seven duty headings. These headings are useful as a map of what a competent pump installer does, and they shape how many candidates organize their preparation. A caution is warranted: these are job-task competencies, not an official exam blueprint. NGWA does not publish percentage weights in the preparation sources used here, and the headings should not be read as a guaranteed count of domains or an even split of questions across the General, K, and L exams. NGWA's separate 2019 Exam Preparation Success Guide uses six preparation categories and omits the administrative duty, which is another reason to treat the seven headings as a study framework rather than a scoring formula.
Domain 1: Determine Client Needs
Everything starts with understanding what the customer actually requires from the water system.
- Demand and usage expectations for the household or facility
- Existing conditions, constraints, and customer priorities
- Translating a request into technical requirements
Domain 2: Assess Job Site
Site evaluation drives nearly every later decision.
- Well and water source characteristics relevant to pump selection
- Physical access, electrical supply, and safety hazards
- Identifying conditions that complicate or limit an installation
Domain 3: Determine System Component Requirements
This is where sizing and selection knowledge matters, and it is closely tied to the split between Exam K and Exam L.
- Matching pump type and capacity to the flow and pressure requirement
- Selecting pipe, controls, tanks, and electrical components
- Understanding how systems under and over 100 gpm differ in practice
Domain 4: Prepare to Install the Pump
Preparation prevents field errors.
- Verifying materials, tools, and equipment before arriving at the well
- Confirming safety procedures and electrical readiness
- Staging the work to avoid damage and rework
Domain 5: Install Pump System
The core hands-on duty of the occupation.
- Correct installation sequence and component connections
- Electrical wiring, grounding, and protection practices
- Start-up, testing, and verifying that the system performs as designed
Domain 6: Troubleshoot Existing Pump System
Diagnosing a failing system is a distinct skill from installing a new one.
- Systematic fault-finding on performance and pressure complaints
- Recognizing electrical versus mechanical versus hydraulic causes
- Deciding between repair, adjustment, and replacement
Domain 7: Perform Administrative Activities
Professional practice includes the paperwork side of the trade.
- Documentation, record keeping, and customer communication
- Compliance awareness and professional responsibilities
For deeper treatment of each area, the CPI exam domains guide expands on the seven headings and how to think about them.
Eligibility and Application Mechanics
CPI is not an entry-level credential you can pick up straight out of a classroom. NGWA requires a documented track record before certification is granted. To qualify you must:
- Be at least 20 years old.
- Have 24 consecutive months of full-time drilling and/or pump-installation experience.
- Provide two written professional references from people not affiliated with your current employer.
- Complete the application and sign the certification agreement.
- Provide the required affidavit of legal standing.
There is also a timing rule worth marking on your calendar: certification enrollment must be completed within 12 months of passing the qualifying examination. Passing the exams and then letting the paperwork lapse can cost you the result. The full breakdown of prerequisites lives in the CPI requirements guide.
Key Takeaway
Think of the experience and references as the gate and the exams as the proof. Start collecting reference commitments early, because arranging two written references from people outside your current employer can take longer than studying.
What the Exams Cost
The examination fee is US$75 per examination, and it is the same for NGWA members and non-members. Because the minimum route is two exams, the minimum exam-fee total is US$150. That figure is exam fees only. It is not an all-in certification price, and it does not include study materials, travel to a testing center, or retakes. Where older application or FAQ pages mention a generic member discount, the current examination-specific tariff takes precedence.
For a fuller view of what a candidate should budget, including how to think about costs beyond the exams themselves, see the CPI certification cost breakdown. If you are weighing whether the spend makes sense for your career, the CPI ROI analysis covers that question.
Keeping the Credential Current
Certification is not permanent. Annual maintenance requires three things:
- Seven continuing education points (CEPs).
- A renewal fee.
- An affidavit addressing professional standing and required licensure.
Do not translate CEPs into "seven classroom hours." CEPs are a points system, and treating them as equivalent to seat time is a common misreading. 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. Renewal requirements are due December 31.
The currently linked renewal form is titled "2027 NGWA Voluntary Certification Renewal" even though its filename references 2026. It lists CPI renewal at US$50 for members and US$150 for non-members. Because forms and fees can change, treat these figures as what the linked form shows now and verify them when your renewal comes due.
Certification Versus a State License
This is the most frequent source of confusion. CPI is voluntary and individual. Some states license or register water well and pump contractors under their own statutes, with their own fees, exams, and rules. Those requirements are state-specific and are not part of the NGWA credential. For example, a state labor department page describing water well contractor requirements may reference a multiple-choice exam format, but its licensing and registration rules apply only within that state and do not transfer to CPI.
The renewal affidavit's reference to "required licensure" reflects this reality: NGWA expects you to hold whatever license your jurisdiction demands. In practical terms, CPI complements a license where one is required and may stand on its own as a professional credential where none is.
| Aspect | CPI Certification | State License |
|---|---|---|
| Issuer | NGWA | State or local authority |
| Nature | Voluntary, individual | Legal requirement where imposed |
| Rules | Uniform NGWA standards | Vary by jurisdiction |
| Substitutes for the other? | No | No |
Who Benefits From Holding It
The credential is most relevant to people working in residential and commercial water systems: pump installers, well and pump service technicians, drilling-company crew members moving into installation roles, and owners or foremen who want a verifiable way to document their expertise. Employers in the groundwater and water well industry may use certification as a signal when hiring or assigning responsibility, and customers may take it as reassurance about professional standards.
Be realistic about what the credential does and does not promise. It documents experience and knowledge; it does not guarantee a particular wage or job title. If you want to explore the labor-market side, the CPI jobs overview and the CPI salary guide are the right next reads, and you should interpret any earnings discussion with the understanding that pay varies by region, employer, and experience.
Sequencing Your Preparation Around the Duties
Because the exams are closed-book and the duties build on one another, a sensible order follows the job itself. This is a sample sequence rather than an official schedule, and you should adjust the pacing to your own experience.
Client Needs and Job Site
- Review how requirements and site conditions drive system design
- Practice reading a scenario and identifying what information is missing
Component Requirements
- Work sizing and selection logic carefully
- Decide early whether Exam K or Exam L fits your daily work, and study that threshold
Preparation and Installation
- Reinforce installation sequence, electrical safety, and start-up checks
Troubleshooting and Administration
- Drill fault-finding reasoning across electrical, mechanical, and hydraulic causes
- Take timed practice sets at 50 questions in 60 minutes
Timed practice matters here because the pace is fixed at 60 minutes for 50 questions. You can build that rhythm with the CPI practice tests, then use the CPI study guide for a fuller preparation framework and the CPI cheat sheet for a final-review checklist. If you are unsure how demanding the material will feel, read how hard the CPI exam is before you commit to a timeline. Keep in mind that no verified pass-rate figure is assumed here; the CPI pass rate discussion explains what can and cannot be said about outcomes.
Key Takeaway
Do not study the seven duties as seven equal blocks. NGWA publishes no percentage weights in the preparation sources reviewed here, so spend extra time on the areas where your daily work is thinnest, and treat the specialty exam (K or L) as its own subject.
Frequently Asked Questions
CPI stands for Certified Pump Installer, a voluntary individual credential administered by the National Ground Water Association. It is unrelated to other credentials that happen to share the acronym.
At minimum, two: the Water systems general exam plus either Exam K (systems under 100 gpm) or Exam L (systems over 100 gpm). Each has 50 questions, a 60-minute limit, and a 70% passing standard, and the required exams must be passed within one 12-month period.
No. NGWA membership is not required. The exam fee is US$75 per examination for both members and non-members, though renewal pricing on the currently linked form differs between members and non-members.
No. CPI is a voluntary individual certification, not a substitute for any state license. Licensing and registration rules are set by your state or locality and vary.
You must be at least 20 years old with 24 consecutive months of full-time drilling and/or pump-installation experience, plus two written professional references unaffiliated with your current employer, a signed certification agreement, and an affidavit of legal standing.