100+ Free CO Plumber Practice Questions
Pass your Colorado Journeyman Plumber License Exam exam on the first try — instant access, no signup required.
Loading questions...
Key Facts: CO Plumber Exam
70%
Passing Score
DORA State Plumbing Board
80
Questions
4 hours time limit
$150-$300
Exam Fee
PSI
IPC
Code Basis
Colorado adopts the International Plumbing Code (IPC) with state amendments
Colorado's journeyman plumber exam has approximately a 60% pass rate. The 80-question exam requires 70% to pass and is based on the IPC. Colorado adopts the International Plumbing Code (IPC) with state amendments. The exam is open book..
About the CO Plumber Exam
The Colorado journeyman plumber exam is administered by PSI on behalf of the DORA State Plumbing Board. Colorado plumber exams are open book — candidates may bring approved IPC code books. It tests knowledge of the IPC, drainage systems, water supply, venting, gas piping, and Colorado-specific amendments.
Questions
80 scored questions
Time Limit
4 hours
Passing Score
70%
Exam Fee
$150-$300 (DORA State Plumbing Board)
CO Plumber Exam Content Outline
Drainage, Waste & Vent Systems
IPC drain sizing, fixture units, slope requirements, cleanouts, trap seals, and DWV installation per Colorado amendments
Water Supply & Distribution
Pipe sizing, backflow prevention, cross-connection control, water heaters, pressure regulation, and T&P relief requirements
Venting Systems
Vent sizing, wet venting, circuit venting, air admittance valves, vent termination per the IPC
Gas Piping & Appliances
Gas pipe sizing, BTU calculations, pressure testing, appliance venting, and combustion air requirements
Code Administration & Materials
Permits, inspections, approved materials, joint methods, pipe supports, and Colorado-specific rules
How to Pass the CO Plumber Exam
What You Need to Know
- Passing score: 70%
- Exam length: 80 questions
- Time limit: 4 hours
- Exam fee: $150-$300
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
CO Plumber Study Tips from Top Performers
Frequently Asked Questions
What plumbing code does Colorado use?
Colorado adopts the International Plumbing Code (IPC) with state amendments. The exam is open book.. The DORA State Plumbing Board oversees all licensing requirements. The exam is based on the current adopted IPC edition.
How many questions are on the Colorado plumber exam?
The Colorado journeyman plumber exam has approximately 80 multiple-choice questions with a time limit of 4 hours. A score of 70% is required to pass.
Who administers the Colorado plumber exam?
The exam is administered by PSI on behalf of the DORA State Plumbing Board. You must apply through the agency and schedule your exam through PSI's testing system.
What experience is required for the Colorado journeyman plumber exam?
Completion of plumbing apprenticeship (typically 4 years) or equivalent documented experience. Contact the DORA State Plumbing Board for specific requirements and application procedures.