- PSI's CT-P2 exam is 70 scored questions in 150 minutes; 49 correct answers passes.
- Exam fee is $59 per attempt through PSI, separate from the $90 DCP application fee.
- Drain, Waste, and Vent is the single largest domain at 11 questions.
- Isometric Analysis and Developed length combine for nine questions - practice reading pipe diagrams.
Exam Snapshot: The Numbers You Must Memorize
If you only have ten minutes before walking into a PSI testing center, these are the numbers that matter for the Connecticut P-2 Unlimited Journeyperson Plumber License Exam. This is a trade-only exam - P-2 candidates do not sit for the P-1 contractor Business and Law exam, so every minute of your prep should go toward technical plumbing knowledge, not business law.
- Format: Computer-based, open-book
- Scored questions: 70
- Unscored questions: up to 10 additional, mixed in without identification
- Time limit: 150 minutes total (covers both scored and unscored items)
- Passing score: 70%, or 49 out of 70 scored questions
- Bulletin currency: PSI candidate bulletin revised February 4, 2026
Because up to 10 unscored questions are folded invisibly into your 150 minutes, you can't identify which items "count." Treat every question with equal seriousness and pace yourself assuming all 80 are scored. For a deeper walkthrough of what makes this exam genuinely challenging (or not), see How Hard Is the CT-P2 Exam? Complete Difficulty Guide 2026.
Fees, Eligibility, and Registration Mechanics
The Connecticut Department of Consumer Protection (DCP) and the Plumbing and Piping Work Examining Board oversee licensure, while PSI Services LLC administers the actual test. These are two separate transactions with two separate fees, and understanding the sequence prevents wasted time.
- DCP application fee: $90, submitted before you're eligible to schedule
- PSI examination fee: $59 per attempt
- Annual license renewal fee: $120, due each year
DCP approval must happen before PSI scheduling - you cannot register for the exam until your application is approved. Once approved, your eligibility window lasts one year, and you may take the exam as many times as needed within that year (paying the $59 PSI fee each attempt). This is a meaningful safety net: a failed attempt doesn't reset your clock or require a fresh DCP application. For the full cost picture including renewals and continuing education, read CT-P2 Certification Cost 2026: Complete Pricing Breakdown.
Who Qualifies to Sit for the Exam
Eligibility requires either an approved apprenticeship or documented equivalent experience and training. DCP's equivalency pathway specifically requires 8,000 on-the-job hours and 576 classroom hours. If you're unsure which route applies to you, or how to document non-apprenticeship experience, the detailed breakdown at CT-P2 Requirements 2026: Eligibility, Prerequisites & How to Qualify walks through both paths.
Key Takeaway
Submit your DCP application well before you intend to test - approval must be finalized before PSI will let you schedule, and processing isn't instantaneous.
Allowed References and What's in Your Bag
Because this is an open-book exam, knowing exactly which books are permitted - and how they must be prepared - is as important as knowing the plumbing content itself. PSI's approved reference list for CT-P2 includes:
- International Plumbing Code (2015, 2018, or 2021 edition)
- NFPA 54 National Fuel Gas Code or Handbook, 2012
- NFPA 58 Liquefied Petroleum Gas Code, 2014
- OSHA 29 CFR 1926, latest amendments or PSI-listed selections
- Water Processing: Residential, Commercial, Light Industrial, third edition, 2000
- NFPA 56, current edition as listed by PSI
Mathematics for Plumbers and Pipefitters and Plumbing Design and Installation are study-only resources - you can learn from them at home, but you cannot bring them into the testing room. Confusing "recommended reading" with "permitted reference" is a common and avoidable mistake.
How Your Books Must Be Prepared
PSI allows prior highlighting, underlining, annotation, and permanent tabs in your reference books. What's prohibited: question-and-answer notes, loose or attached papers, temporary sticky tabs, and any writing during the exam itself. A silent, nonprinting, nonprogrammable calculator is permitted for developed length and other math-heavy questions. Bring your own approved books - the test center will not supply them.
Domain Weight Cheat Sheet
PSI's published outline splits the 70 scored questions across 16 domains. Knowing the weight of each domain tells you where to spend your limited study hours. For the complete explanation of every domain's content, see CT-P2 Exam Domains 2026: Complete Guide to All 16 Content Areas.
| Domain | Approximate Weight |
|---|---|
| Drain, Waste, and Vent | 11 questions (largest single domain) |
| Isometric Analysis + Developed length (combined) | 9 questions |
| General Plumbing Regulations | Part of remaining outline |
| Gas Systems | Part of remaining outline |
| Cleanouts | Part of remaining outline |
| Fixtures and Equipment | Part of remaining outline |
| Water Heaters | Part of remaining outline |
| Piping, Valves, Controls | Part of remaining outline |
| Water Supply | Part of remaining outline |
| Hangers and Supports | Part of remaining outline |
| Backflow | Part of remaining outline |
| Traps and Interceptors | Part of remaining outline |
| Joints and Connections | Part of remaining outline |
| Safety and Excavation | Part of remaining outline |
| Water Treatment | Part of remaining outline |
Drain, Waste, and Vent alone represents almost one-sixth of the entire scored exam - more than any other single domain. Combined with Isometric Analysis and Developed length, these three areas account for 20 of the 70 scored questions, meaning nearly 29% of your score rides on pipe layout, venting logic, and reading isometric drawings.
High-Yield Topics by Domain
Below are the specific concepts within the heaviest domains that consistently deserve extra study time.
Drain, Waste, and Vent
The largest domain on the exam covers how waste and vent piping is sized, sloped, and connected throughout a system.
- Trap arm distance limits relative to vent connection
- Minimum and maximum slope requirements for horizontal drainage piping
- Vent sizing based on fixture units and developed length
- Common venting configurations for back-to-back fixtures
Isometric Analysis
Questions test your ability to read a plumbing isometric drawing and identify pipe runs, fittings, and fixture connections.
- Tracing waste flow direction through a multi-fixture isometric
- Identifying missing cleanouts or vent connections on a drawing
- Matching fitting symbols to their real-world function
Developed length
This domain is calculation-heavy and directly tied to your calculator.
- Calculating total developed length including fitting equivalents
- Applying developed length to vent and fuel gas pipe sizing
- Cross-referencing NFPA 54 sizing tables against calculated distances
Gas Systems
Fuel gas questions draw heavily on NFPA 54 and NFPA 58, so know how to navigate both codes quickly.
- Pipe sizing tables in NFPA 54 for natural gas branch lines
- LP-gas container clearance and installation rules from NFPA 58
- Shutoff valve placement requirements
Backflow and Water Supply
These domains often overlap in real-world scenarios involving cross-connection control.
- Air gap versus mechanical backflow preventer selection
- Water supply pipe sizing based on fixture demand
- Where backflow protection is required by fixture type
For a more granular look at every remaining domain - including Cleanouts, Hangers and Supports, Traps and Interceptors, Joints and Connections, Safety and Excavation, and Water Treatment - the domain guide linked above breaks each one down individually.
Last-Week Review Plan
In the final stretch before your scheduled PSI appointment, resist the urge to start new material. Instead, cycle through your tabbed references in proportion to domain weight.
Drain, Waste, and Vent + Isometric Analysis
- Rework isometric practice drawings under a timer
- Confirm your IPC tabs cover trap arm and vent sizing tables
Developed length + Gas Systems
- Practice calculator-based sizing problems using NFPA 54 tables
- Verify LP-gas clearance rules from NFPA 58
Remaining domains sweep
- Quick-review Backflow, Water Supply, Fixtures and Equipment, Water Heaters
- Spot-check Safety and Excavation, Joints and Connections, Hangers and Supports
Logistics and light review
- Confirm PSI appointment time and ID requirements
- Repack only approved, properly-tabbed references - no loose notes
This week-by-week weighting mirrors the domain point spread, not generic study advice - Drain, Waste, and Vent and Isometric Analysis get two full days because together they carry more scored points than any other pairing on the outline. For a full-length study plan starting weeks earlier, see CT-P2 Study Guide 2026: How to Pass on Your First Attempt.
After You Pass: Licensing and Renewal Facts
Passing the PSI exam is not the final step - you still need DCP to issue the actual P-2 license, and that license comes with ongoing obligations.
- Scope of work: P-2 Unlimited Journeyperson Plumbers work only as employees of properly licensed contractors - this credential does not authorize independent contracting.
- Expiration: The license expires annually on October 31.
- Continuing education: Five approved CE credit hours are required every two years, due by July 31 of odd-numbered years. Your first renewal cycle is exempt from this requirement.
- Renewal fee: $120 annually.
Understanding this timeline matters when planning your exam date - passing in late fall versus early spring changes how soon your first renewal deadline arrives. See CT-P2 Exam Dates 2026: Testing Windows, Deadlines & Scheduling for scheduling considerations.
If any of the terminology above still feels unfamiliar - DCP, PSI, or the P-2 classification itself - the foundational explainers at What Is CT-P2? and CT-P2 Meaning are good starting points before diving into a full cheat-sheet review. And if you want to gauge readiness against the actual 70-question, 150-minute format described above, practicing under realistic conditions on our CT-P2 practice test platform is the closest simulation you'll find outside the PSI testing center.
FAQ
The exam has 70 scored questions, plus up to 10 unscored questions mixed in. You need 49 correct scored answers, or 70%, to pass. Full details are at CT-P2 Passing Score 2026: Exactly What You Need to Pass.
Yes. Candidates may bring approved reference books including the IPC, NFPA 54, NFPA 58, OSHA 29 CFR 1926, a water processing reference, and NFPA 56. Books may have prior highlighting, underlining, and permanent tabs, but no loose notes or writing during the test.
No. The P-2 Unlimited Journeyperson Plumber classification requires only the trade examination, not the P-1 contractor Business and Law exam.
Your DCP eligibility lasts one year with unlimited attempts during that window. Each retake requires paying the $59 PSI exam fee again, but you don't need to reapply to DCP unless your eligibility year expires.
Expect a $90 DCP application fee, a $59 PSI exam fee per attempt, and a $120 annual renewal fee once licensed. A full cost breakdown is available at CT-P2 Certification Cost 2026: Complete Pricing Breakdown.