- What Is the TN-CMCA Certification?
- Who Governs and Administers the Exam
- Exam Format and Scoring
- The 12 Exam Domains
- Eligibility and Preapproval
- Fees and Costs at Each Step
- Scheduling and Delivery Options
- After You Pass: Licensing and Renewal
- Building a Study Plan Around the Domain Weights
- Who Actually Needs This Certification
- Frequently Asked Questions
- The TN-CMCA is a 100-question, open-book, computer-based exam with a 5-hour limit and 73% passing score.
- Prov administers the exam under the Tennessee Board for Licensing Contractors, with a $53 fee per attempt.
- Board preapproval costs $50 and requires three years of plumbing experience or a plumbing/mechanical engineering degree.
- Drain, Waste, and Vent Systems (20%) and Isometrics (18%) are the two heaviest-weighted domains.
What Is the TN-CMCA Certification?
The Tennessee Plumbing (CMC-A) Contractor Examination, commonly shortened to TN-CMCA, is the qualifying exam required for individuals seeking a Plumbing (CMC-A) contractor classification under Tennessee's licensing system. It's a credential tied directly to legal authorization to bid, contract, and perform plumbing work in the state - not a voluntary skills badge. If you're still getting oriented, our companion pieces What Is TN-CMCA? and TN-CMCA Meaning walk through the terminology in more depth, while What Does TN-CMCA Stand For? breaks down the acronym itself.
This article focuses on the mechanics that matter most to a candidate: who runs the exam, what it covers, how much it costs at every stage, and how the content is weighted. For a full walkthrough of eligibility rules, see TN-CMCA Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Who Governs and Administers the Exam
The Tennessee Board for Licensing Contractors is the governing authority for the Plumbing (CMC-A) classification. Actual exam delivery, scheduling, and scoring is handled by Prov, which has administered new exam appointments since July 1, 2026. The bulletin currently in effect is dated July 13, 2026, and it's the authoritative source for procedural details, reference materials, and testing policies.
Exam Format and Scoring
The TN-CMCA exam is open-book and computer-based, consisting of 100 multiple-choice questions. Candidates get a 5-hour time limit, and a score of 73% is required to pass. Because it's open-book, the exam rewards candidates who know how to navigate their references quickly rather than those who have memorized every code section verbatim.
Approved references include:
- 2021 International Plumbing Code
- 2018 or 2021 International Fuel Gas Code
- Mathematics for Plumbers and Pipefitters, 8th Edition
- OSHA 29 CFR Part 1926
- Plumbing Basics for Contractors, 4th Edition (2021)
Exam scores are typically valid for two years, which matters if you're staging your application around Business and Law testing or licensing paperwork. For a granular breakdown of exactly what the 73% threshold means in terms of correct answers, read TN-CMCA Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Because the exam is open-book, spend prep time learning where information lives in each reference - tabbing your IPC and Fuel Gas Code copies can save significant minutes on test day.
The 12 Exam Domains
The TN-CMCA blueprint spans twelve content areas. Two domains carry outsized weight and deserve proportionally more study time:
Domain 11: Drain, Waste, and Vent Systems (20% - largest domain)
This is the single heaviest-weighted domain on the exam. Expect questions on trap arrangements, vent sizing, cleanout placement, and slope requirements pulled from the 2021 International Plumbing Code.
- Master fixture unit calculations and pipe sizing tables
- Know venting configurations (wet vents, common vents, island venting)
Domain 9: Isometrics (18% - second largest)
Isometric drawing interpretation tests your ability to read three-dimensional piping layouts from two-dimensional diagrams - a skill that can't be crammed the night before.
- Practice reading isometric riser diagrams under time pressure
- Cross-reference drawings against DWV and water supply code requirements
The remaining ten domains - General Knowledge, Plumbing Math, Code Requirements, Fixtures and Fittings, Water Heaters, Storm Drainage, Fuel Gas Systems, OSHA Safety, Water Supply and Distribution, and Tools and Installation Practices - round out the remaining question pool. A full breakdown of every domain, including how to sequence your review, is covered in TN-CMCA Exam Domains 2026: Complete Guide to All 12 Content Areas.
| Domain | Relative Weight |
|---|---|
| Drain, Waste, and Vent Systems | Largest (20%) |
| Isometrics | Second-largest (18%) |
| General Knowledge | Standard |
| Plumbing Math | Standard |
| Code Requirements | Standard |
| Fixtures and Fittings | Standard |
| Water Heaters | Standard |
| Storm Drainage | Standard |
| Fuel Gas Systems | Standard |
| OSHA Safety | Standard |
| Water Supply and Distribution | Standard |
| Tools and Installation Practices | Standard |
Eligibility and Preapproval
Before you can even schedule the exam, the Board requires preapproval. This step has its own $50 fee and requires documentation of one of the following:
- At least three years of plumbing experience, or
- A degree in plumbing or mechanical engineering
Beyond preapproval, applicants must also pass the separate Tennessee Business and Law exam and satisfy financial-capacity, reference, liability-insurance, and workers' compensation requirements. None of these are optional add-ons - they're baked into the licensing pathway. If you want the complete list laid out step by step, see TN-CMCA Requirements 2026.
Fees and Costs at Each Step
Budgeting for the TN-CMCA pathway means accounting for several distinct fees, not just the exam itself:
- Board preapproval: $50
- Prov exam fee: $53 per attempt
- Initial contractor application: $250
- License renewal: $200 every two years
These add up to a meaningful investment before you're actively contracting. For a full breakdown of how these fees stack against retake scenarios and renewal cycles, see TN-CMCA Certification Cost 2026: Complete Pricing Breakdown. And if you're weighing whether the time and money are justified, Is the TN-CMCA Certification Worth It? Complete ROI Analysis 2026 covers that question directly.
Scheduling and Delivery Options
Prov offers two delivery formats: in-person at a test center, or remote via Examroom. Both formats give access to the same open-book references, so the choice mostly comes down to personal preference - some candidates focus better in a dedicated test center, while others prefer the flexibility of testing from a controlled home or office environment.
Because preapproval must be finalized first, plan your calendar backward from your target test date. Details on testing windows, blackout periods, and how far in advance to book are covered in TN-CMCA Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
After You Pass: Licensing and Renewal
Passing the exam is a milestone, not the finish line. Your score is generally valid for two years, giving you a window to complete the remaining licensing steps - including the Business and Law exam and the $250 initial application - before the score expires. Once licensed, renewal comes every two years at $200.
Because the timeline between passing and full licensure can stretch out while you gather insurance documentation and references, it's worth tracking deadlines carefully so your exam result doesn't lapse before your application is complete.
Building a Study Plan Around the Domain Weights
A generic study calendar won't serve you well here - the smarter approach is to weight your preparation the same way the exam weights its content. Since Drain, Waste, and Vent Systems and Isometrics together make up a large share of the 100 questions, they deserve the earliest and most repeated review sessions, not an afterthought squeezed in during the final week.
Drain, Waste, and Vent Systems + Code Requirements
- Work through IPC sections on trap, vent, and cleanout requirements
- Practice fixture unit and pipe sizing problems repeatedly
Isometrics + Plumbing Math
- Drill isometric diagram reading under a timer
- Pair math problems with real piping scenarios, not abstract formulas
Remaining Domains
- Cycle through Fixtures, Water Heaters, Storm Drainage, Fuel Gas, OSHA, Water Supply, and Tools
- Run full-length practice sets to build 5-hour stamina
For a complete week-by-week roadmap with specific resource recommendations, see TN-CMCA Study Guide 2026: How to Pass on Your First Attempt. If you want a quick-reference version to keep handy during final review, the TN-CMCA Cheat Sheet 2026: One-Page Review of Must-Know Facts condenses the highest-value facts into one page. You can also sharpen your timing and question familiarity using the practice exams on the main practice test site before test day.
Who Actually Needs This Certification
The TN-CMCA is aimed at individuals pursuing a Plumbing (CMC-A) contractor classification in Tennessee - typically experienced plumbers moving into contracting roles, or those with a plumbing or mechanical engineering degree seeking the credential without the full three-year experience requirement. Contracting firms, subcontracting outfits, and independent operators all rely on licensed CMC-A holders to legally bid and sign off on plumbing work.
If you're evaluating career impact, TN-CMCA Salary Guide 2026: Complete Earnings Analysis and TN-CMCA Jobs explore what the credential opens up on the employment side, while TN-CMCA Training covers preparation resources beyond self-study. For readers still deciding whether to commit to the exam at all, How Hard Is the TN-CMCA Exam? Complete Difficulty Guide 2026 and TN-CMCA Pass Rate 2026: What the Data Shows offer additional context, and What Is A TN-CMCA? and What Does TN-CMCA Mean? can clarify terminology for anyone new to the process. Related overview content also lives at What Is TN-CMCA Certification? and TN-CMCA Certification.
Frequently Asked Questions
The exam has 100 multiple-choice questions with a 5-hour time limit, and you need a 73% score to pass.
Yes. Approved references include the 2021 International Plumbing Code, the 2018 or 2021 International Fuel Gas Code, Mathematics for Plumbers and Pipefitters (8th Edition), OSHA 29 CFR Part 1926, and Plumbing Basics for Contractors (4th Edition, 2021).
Yes. The Tennessee Board for Licensing Contractors requires preapproval, which costs $50 and requires proof of at least three years of plumbing experience or a plumbing/mechanical engineering degree.
Drain, Waste, and Vent Systems is the largest domain at 20%, followed by Isometrics at 18%. The remaining ten domains fill out the rest of the question pool.
Scores are typically valid for two years. After passing, you still need to pass Tennessee Business and Law and meet financial, reference, and insurance requirements before submitting the $250 initial application; licenses then renew every two years for $200.