CO-MP Passing Score 2026: Exactly What You Need to Pass

What Score Do You Actually Need?

If you're scheduling the Colorado Master Plumber License Exam (CO-MP) through PSI Services LLC on behalf of the Colorado State Plumbing Board and DORA, the number that matters most is simple: 70%. According to the June 18, 2026 PSI candidate bulletin, that translates to 84 correct answers out of 120 scored questions, based on overall performance across the exam rather than a minimum score in each individual domain.

That last part is important. Some licensing exams require you to clear a threshold in every content area separately. CO-MP does not work that way - your raw score is calculated across all 120 scored items combined. A weak showing in a smaller domain like Isometric Analysis can still be offset by strong performance in a heavily weighted domain like Sanitary Drainage Systems, as long as your total lands at 84 or above.

How PSI Calculates Your Result

The CO-MP is a computer-based, multiple-choice exam. You'll answer 120 scored questions, and the exam may also include up to 10 unscored (pretest) questions mixed in without being labeled as such. These unscored items exist so PSI can evaluate new questions for future versions of the exam - they don't count toward your 84-question target, but you won't know which ones they are, so every question deserves your full attention.

Because the passing standard is based on overall performance rather than domain-specific cutoffs, your strategy should focus on total correct answers rather than perfecting any single content area. This is one reason candidates benefit from reviewing the full breakdown in the CO-MP Exam Domains 2026: Complete Guide to All 11 Content Areas before building a study plan - knowing which domains carry the most raw points changes how you allocate review time.

Domain Weighting and Why It Matters for 84/120

The official scored-item allocation across the 11 domains is fixed. Here's exactly how the 120 scored questions break down:

Notice that Sanitary Drainage Systems (22 questions) and Vents (20 questions) together account for 42 of the 120 scored questions - more than a third of the entire exam. Mastering these two domains alone gets you within striking distance of the 84-question passing threshold, which is why they deserve disproportionate study time relative to smaller domains like Residential Fire Sprinklers (only 4 questions).

For a fuller walkthrough of what each of the 11 domains actually tests, the CO-MP Exam Domains 2026: Complete Guide to All 11 Content Areas breaks down topic-level detail domain by domain, which pairs directly with the point values above.

Exam Format: Time, Questions, and Pacing

You'll have 270 minutes to answer the 120 scored questions. If your exam session includes the unscored pretest items, you'll receive an additional 30 minutes, bringing your total available time to 300 minutes when applicable. Doing the math, 270 minutes across 120 questions gives you roughly 2.25 minutes per question on average - generous for straightforward code-lookup questions, but tighter for multi-step isometric or sizing problems that require you to trace a drawing or run a calculation.

The exam is delivered in English and Spanish, and approved ESL accommodations include time-and-a-half and a qualifying translation dictionary. If you need either, confirm the accommodation request process with PSI well before your scheduling window closes.

Reference Materials You're Allowed to Use

Unlike open-book trade exams you may have taken before, CO-MP has strict limits on references. PSI supplies a 2021 IPC and 2021 IRC at the terminal - and that's it. You cannot bring your own copies, and even the provided books come with restrictions: no writing in, highlighting, underlining, or indexing is allowed on the PSI-supplied volumes.

Personal reference books and formula sheets of any kind are prohibited. There's no bringing your own annotated code book, no sticky-note tabs, no cheat sheet of formulas. An on-screen calculator is provided within the testing software, so you don't need to bring a physical one.

One detail that trips up experienced Colorado tradespeople: Colorado-specific amendments to the plumbing code are not tested. The exam is based strictly on the base 2021 IPC and IRC language, not local amendment language you may be used to referencing on the job. Building the habit of navigating an unmarked code book quickly - without your usual tabs - is a skill worth practicing before test day, something covered in more depth in the CO-MP Study Guide 2026: How to Pass on Your First Attempt.

Fees, Retakes, and Scheduling Mechanics

The initial CO-MP exam attempt costs $78. If you don't pass and need to retake it, the retake fee is $73. Payment remains valid for one year, so plan your scheduling and any retake within that window to avoid paying again from scratch.

Because the exam is scored as a single combined total against the 84/120 threshold, a near-miss score doesn't tell you which domains sank you unless you review your score report carefully. Use that breakdown to target your retake prep rather than re-studying everything from zero. A detailed look at what the fees, retake costs, and total out-of-pocket investment look like across the whole licensing path is available in the CO-MP Certification Cost 2026: Complete Pricing Breakdown.

Passing Is Not Licensing: What Comes Next

Here's a distinction candidates often miss: passing the CO-MP exam does not, by itself, establish your experience eligibility or grant you a license. The exam is meant to be taken before you apply for licensure - but separately, you also need 8,500 verified practical-experience hours, and critically, you cannot verify your own experience. Someone else - typically a supervising licensed plumber or employer - has to sign off on those hours through the Board's process.

This means a candidate could pass the exam cleanly and still be months or years away from actual licensure if their experience documentation isn't in order. If you're unsure whether your hours and documentation line up with Board expectations, review the full breakdown in CO-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify before you even schedule your exam date.

Once licensed, renewal isn't a one-time formality either. Continuing education requires 8 CE hours per year, totaling 16 hours across the March 1, 2025-February 28, 2027 cycle. First-time licensees by examination are exempt from CE until their first renewal - but plan for it after that, since three-year renewal terms begin March 1, 2027, changing the CE cadence going forward.

Turning the Passing Score Into a Study Target

Once you know the target is 84 correct out of 120, and you know exactly how those 120 questions are distributed, you can build a study calendar that mirrors the exam's actual weighting instead of spreading time evenly across all 11 domains.

Running full-length, timed practice sets on our practice test platform is one of the most direct ways to see whether your pacing and accuracy will actually clear 84/120 under real exam conditions, rather than just under casual review. If you want a sense of how difficult that target feels in practice compared to other trade licensing exams, How Hard Is the CO-MP Exam? Complete Difficulty Guide 2026 walks through the format and content demands in more detail, and CO-MP Pass Rate 2026: What the Data Shows looks at what's publicly known about outcomes.

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