CO-MP Pass Rate 2026: What the Data Shows

Why Colorado Doesn't Publish a CO-MP Pass Rate

If you searched for "CO-MP Pass Rate 2026" hoping to find a single published percentage of candidates who clear the Colorado Master Plumber License Exam, you won't find one. The Colorado State Plumbing Board (DORA) and its testing partner, PSI Services LLC, do not release aggregate pass/fail statistics for the Master Plumber (MP) exam. That's a meaningful difference from how some other trade credentials report outcomes, and it means anyone quoting a specific pass-rate figure for this exam is either guessing or importing data from an unrelated program.

What we do have is something arguably more useful for exam preparation: the exact scoring mechanics, the exact question-count breakdown by domain, and the exact format constraints candidates operate under. This article works through that verified data so you can build a realistic picture of difficulty and where your study time is best spent, without relying on invented statistics.

What the Scoring Data Actually Shows

The passing standard is unambiguous: 70%, or 84 out of 120 scored questions, based on overall performance across the exam rather than a minimum score in any single domain. That last detail matters. A candidate who is weak in one smaller domain but strong across the larger ones can still pass, because the board evaluates the total scored result rather than requiring a pass mark in every content area individually.

The exam delivers 120 scored multiple-choice questions in 270 minutes, computer-based through PSI. Up to 10 additional unscored (pretest) questions may appear, with an extra 30 minutes allotted for them. Candidates cannot identify which questions are unscored, so every question needs to be treated as if it counts. For a full breakdown of exactly how the passing threshold is calculated, see CO-MP Passing Score 2026: Exactly What You Need to Pass.

Domain Weighting: Where the Points Live

This is the single most actionable data point in the entire bulletin. The 120 scored questions are distributed across 11 domains, and the distribution is far from even. Two domains - Sanitary Drainage Systems and Vents - together account for 42 of the 120 scored questions, or 35% of the exam.

Sanitary Drainage Systems is the largest single domain at 22 questions, with Vents close behind at 20. Together with Water Supply (16) and Storm Drainage Systems (12), these four domains represent 70 of the 120 scored questions - well over half the exam. Residential Fire Sprinklers, at only 4 questions, is the lightest domain by far, and General Regulations, Traps/Interceptors/Separators, and Indirect and Special Waste Piping each sit at just 6 questions.

For candidates deciding where to spend limited prep time, this allocation is the closest thing to hard performance data the CO-MP offers. A deeper walkthrough of what each domain actually tests is available in CO-MP Exam Domains 2026: Complete Guide to All 11 Content Areas.

Format and Timing Data

The CO-MP is delivered as a computer-based multiple-choice exam at PSI test centers, available in English and Spanish. Candidates get 270 minutes for the 120 scored questions, plus up to 30 additional minutes if unscored pretest questions are included in that particular form. There is no separate written or practical component - every question is scored the same multiple-choice way.

Approved ESL accommodations include time-and-a-half and a qualifying translation dictionary, which candidates should request through the proper channel before scheduling. An on-screen calculator is provided during the exam, so bringing your own is unnecessary and personal formula sheets are not permitted regardless. For a broader sense of how this format compares to the difficulty candidates report, see How Hard Is the CO-MP Exam? Complete Difficulty Guide 2026.

Fee and Retake Mechanics

The initial exam fee is $78; a retake costs $73. Payment is valid for one year, so candidates who don't schedule promptly risk having to pay again. Because retakes cost nearly as much as the initial attempt, walking in unprepared and treating the exam as a "practice run" is an expensive strategy compared to using a structured prep resource beforehand. A full cost breakdown, including how these fees fit into the total licensing path, is covered in CO-MP Certification Cost 2026: Complete Pricing Breakdown.

The Reference Materials Data Point

One of the more concrete pieces of exam-day data: PSI supplies the 2021 IPC and IRC at the testing center, and candidates cannot write in, highlight, underline, or index these books beforehand. Personal reference books and formula sheets are prohibited entirely. Colorado amendments to the model codes are not tested on the CO-MP - the exam draws from the base 2021 IPC and IRC text.

This is a practical data point that changes how you should study: memorizing where information lives inside the standard, unmarked code book layout is more valuable than building a personalized annotated copy, since you won't have access to your own markup on exam day.

Experience Requirement Data

Separate from the exam itself, Master licensure in Colorado requires 8,500 verified practical-experience hours, and applicants cannot verify their own experience - someone else must confirm those hours. Critically, candidates take the examination before applying for the license, and passing the exam does not by itself establish experience eligibility. These are two independent tracks that both need to be satisfied. If you're mapping out your full path to licensure, including how the experience and exam requirements interact, review CO-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Turning This Data Into a Study Priority List

Given the fixed nature of the domain weights, a study schedule built around the question allocation makes more sense than a generic weekly template. The approach below anchors each week to the exam's actual point distribution rather than treating all 11 domains as equally important.

This is not a claim about guaranteed results - it's simply a logical allocation of study time proportional to how the exam itself allocates points. For a more detailed week-by-week plan and technique recommendations, see CO-MP Study Guide 2026: How to Pass on Your First Attempt, and for a condensed reference you can revisit right before test day, check the CO-MP Cheat Sheet 2026: One-Page Review of Must-Know Facts. You can also run full-length timed simulations on our practice test platform to get comfortable with the pacing before your actual appointment.

Renewal and CE Data After You Pass

Passing data doesn't end at the exam - renewal requirements shape how the credential is maintained. Colorado requires 8 continuing education hours each year, totaling 16 hours across the March 1, 2025 to February 28, 2027 cycle. First-time licensees who obtained their license by examination are exempt from CE until their first renewal. Starting March 1, 2027, renewal terms shift to a three-year cycle. If you're weighing whether the ongoing CE commitment and licensing costs make sense for your career, Is the CO-MP Certification Worth It? Complete ROI Analysis 2026 walks through that calculation, and CO-MP Salary Guide 2026: Complete Earnings Analysis looks at earnings context for licensed master plumbers.

Once you're confident on the format, weighting, and renewal mechanics covered here, the most useful next step is timed practice under real exam conditions. You can start building that familiarity on the main practice test site or browse related prep resources like CO-MP Training and CO-MP Jobs to see how the credential connects to hiring in Colorado's plumbing trade.

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