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

The Exact Passing Score

The passing score for the Colorado Journeyman Plumber License Exam is 70 correct scored answers out of 100, which works out to 70%. That number is fixed by PSI Services LLC, the testing provider that administers the exam on behalf of the Colorado State Plumbing Board within DORA's Division of Professions and Occupations. There is no sliding scale, no curve, and no partial credit for reasoning that gets you "close" to a code answer. You either land on 70 correct or you don't.

This is a simpler target than many licensing candidates expect, but simple doesn't mean easy. If you want a deeper breakdown of how difficult the exam actually feels in practice, see How Hard Is the CO-JP Exam? Complete Difficulty Guide 2026. For a data-driven look at outcomes, check CO-JP Pass Rate 2026: What the Data Shows.

Exam Format and Timing

The CO-JP is a computer-based, open-book exam delivered at PSI test centers. The structure breaks down like this:

• 100 scored questions that count toward your passing score of 70
• Up to 10 additional unscored questions used for pretesting future exam content, given a separate 30-minute allowance
• 240 minutes allotted for the 100 scored items
• An on-screen calculator is available, but plumbing formulas are neither supplied nor permitted - you need to know your formulas going in

Because the unscored questions are mixed in without being labeled, you cannot identify which items count and which don't. Treat every question on screen as if it's part of your 70-out-of-100 target. Time management matters here: 240 minutes for 100 questions gives you roughly two and a half minutes per question, which is generous if you're not stopping to search the reference books for every single item.

The Open-Book Reference Rules

The CO-JP is open-book, but the rules around what "open-book" means are strict and specific to this exam:

• PSI supplies the reference books at the testing center - you cannot bring your own copies
• The exam-specific reference list is published in PSI bulletin 11658, revised June 18, 2026, and specifies the 2021 International Plumbing Code (IPC) and 2021 International Residential Code (IRC)
• Writing, highlighting, underlining, or indexing the supplied books is prohibited
• Colorado amendments are not tested - the exam draws from the base IPC/IRC text, not state-specific modifications

Because reference editions can be updated between bulletin revisions, always check the PSI reference list for your booked test date before you buy study books. Purchasing an outdated edition to practice with can actually work against you if code sections have been renumbered or revised.

How the 100 Questions Break Down by Domain

The CO-JP outline covers 11 domains, and PSI's published outline confirms Sanitary Drainage Systems as the largest single domain. For a full walkthrough of every content area with study priorities, see CO-JP Exam Domains 2026: Complete Guide to All 11 Content Areas.

The remaining domains - Water Supply, Vents, Fixtures and Equipment, General Regulations, Traps/Interceptors/Separators, Storm Drainage Systems, Indirect and Special Waste Piping, Residential Fire Sprinklers, and Water Heaters - round out the 100-item exam. None of them can be safely ignored, since a single weak domain can eat into your margin above 70.

Where Points Are Won and Lost

Because the passing bar is a flat 70%, the smartest use of your study time is identifying which domains are most likely to cost you points - not because they're inherently harder, but because they involve interpretation rather than recall. Isometric Analysis and Sanitary Drainage Systems tend to fall into this category, since both require you to apply code logic to a specific scenario rather than just locate a number in a table.

Domains like General Regulations and Water Heaters are often more straightforward lookups if you know your way around the IPC and IRC index. Spend your open-book practice time getting fast at navigating the code for these, and spend your closed-book memory effort on formulas, fixture unit values, and pipe sizing logic that you'll need to apply quickly under the clock.

If You Don't Hit 70: The Retest Path

If your score falls short of 70 correct, you're not locked out permanently. Colorado's process allows retesting through PSI, and the retest fee is $73, slightly lower than the initial $78 exam fee. There's no penalty domain or additional documentation required simply to retest - you schedule again through PSI and sit for the same 100-question, 240-minute format.

What matters most before a retest is diagnosing which domains pulled your score down. If you were close to 70, a handful of missed questions in one or two domains (often Isometric Analysis or Sanitary Drainage Systems, given their complexity and size) is usually the culprit. Review the full cost picture, including retest fees, in CO-JP Certification Cost 2026: Complete Pricing Breakdown.

Targeting 70% Without Overstudying

Because the passing threshold is fixed and known, your prep doesn't need to chase perfection - it needs to reliably clear 70 across all 11 domains with some buffer. A short, focused study sequence works better than an open-ended review schedule.

For a more complete study framework built around this exact structure, see CO-JP Study Guide 2026: How to Pass on Your First Attempt. If you're still confirming eligibility before you even schedule, review CO-JP Requirements 2026: Eligibility, Prerequisites & How to Qualify, since license qualification requires four years and 6,800 hours of documented practical experience. You can also run through realistic scored practice questions at our CO-JP practice test platform to see how close you are to the 70-question threshold before booking.

Passing Is Not Licensing

One detail candidates frequently overlook: passing the CO-JP exam with 70 or more correct answers does not by itself grant a plumbing license. Candidates must pass the examination before filing the DORA license application, and the application still requires proof of the four years and 6,800 hours of qualifying practical experience. Passing the exam is a prerequisite step, not the finish line.

Once licensed, be aware that the renewal cycle is changing - licenses issued or renewed on or after March 1, 2027 move from a two-year renewal cycle to a three-year cycle. Continuing education still requires eight hours annually, including at least four code hours and no more than two safety hours in each 24-month period. None of this affects your passing score, but it's part of the bigger picture of what happens after you clear the 70% bar.

To understand what the credential means for your career trajectory once you're through both the exam and the application process, see Is the CO-JP Certification Worth It? Complete ROI Analysis 2026 and CO-JP Salary Guide 2026: Complete Earnings Analysis. You can also browse our full CO-JP resource hub for exam scheduling and prep tools in one place.

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