Arizona Plumbing Residential/Commercial Contractor (CR-37) Exam - Online Practice Questions

Prepare for the Arizona Plumbing Residential/Commercial Contractor (CR-37) exam with online practice questions designed to support focused, trade-specific exam preparation. This product includes 3 months of access, giving you a flexible way to review plumbing systems, drain-waste-vent systems, water supply, backflow, roof drains, storm drainage, fixtures, water heaters, accessibility, fuel gas, septic and sewer, hydronics, fire sprinklers, excavation, pipe trades math, safety, and contractor exam-style questions.

The Arizona CR-37 Plumbing Residential/Commercial Contractor exam is part of the Arizona contractor licensing process for contractors preparing to perform plumbing work in both residential and commercial settings. Candidates preparing for this classification should understand the International Plumbing Code, International Fuel Gas Code, International Mechanical Code, OSHA safety standards, NFPA sprinkler references, wastewater provisions, hydronic heating concepts, pipe trades math, field procedures, and Arizona excavation awareness.

This online practice question product helps turn study time into active review. Reading reference books is important, but practice questions help you apply the material, recognize weak areas, and become more comfortable with contractor exam wording. With 3 months of access, you can study in sections, repeat difficult topics, review missed questions, and continue building confidence before your exam date.

The Arizona Plumbing Residential/Commercial Contractor (CR-37) Exam - Online Practice Questions product is useful for candidates who want a self-paced way to prepare before sitting for the trade exam. It can be used alongside approved reference books, highlighted and tabbed materials, classroom instruction, field experience, or independent study. The goal is to help you prepare with structure instead of reading through plumbing code, fuel gas code, mechanical code, sprinkler standards, wastewater rules, hydronic heating, pipe trades, and safety references without a clear plan.

Plumbing work can include piping, fixtures, appliances, water supply systems, sanitary drainage, venting, indirect waste, traps, interceptors, backflow prevention, storm drainage, fuel gas piping, septic systems, sewer lines, fire sprinkler piping, hydronic systems, excavation, and jobsite safety. Because the CR-37 classification covers both residential and commercial work, candidates should prepare for the full range of plumbing exam topics rather than focusing only on one type of system.

What You Get

• Online Practice Questions: Trade-focused questions designed to support preparation for the Arizona Plumbing Residential/Commercial Contractor (CR-37) exam.
• 3 Months of Access: Study online with 3 months of access so you can review, repeat, and strengthen your preparation over time.
• Plumbing Code Review: Practice content supports review of drain-waste-vent systems, water supply, backflow, fixtures, water heaters, storm drainage, indirect waste, traps, interceptors, septic, sewer, and excavation.
• Fuel Gas and Mechanical Support: Questions help reinforce International Fuel Gas Code and International Mechanical Code topics connected to plumbing, fuel gas piping, appliances, hydronics, and related systems.
• Fire Sprinkler and Hydronic Study Support: Practice helps candidates review NFPA sprinkler standards, hydronic heating concepts, pipe trades information, boiler topics, and field calculations.
• Self-Paced Study Format: Work through questions on your own schedule and return to subjects that need additional review.

Exam Details

The Arizona CR-37 Plumbing Residential/Commercial Contractor trade exam follows the plumbing trade exam structure. The exam includes 100 questions, allows 240 minutes, and requires a minimum passing score of 70%. The exam measures knowledge related to drain-waste-vent systems, indirect waste, water supply, backflow, roof drains and storm drainage, plumbing fixtures, water heaters, accessibility, general plumbing knowledge, specialty plumbing, fuel gas, septic and sewer, hydronics, fire sprinklers, and excavation.

The exam content outline includes DWV systems with 15 items, indirect waste with 4 items, water supply with 12 items, backflow with 5 items, roof drains and storm drainage with 5 items, plumbing fixtures including water heaters and accessibility with 6 items, general knowledge with 8 items, specialty plumbing including interceptors and traps with 5 items, fuel gas with 11 items, septic and sewer with 11 items, hydronics with 6 items, fire sprinklers with 6 items, and excavation with 6 items.

DWV systems, water supply, fuel gas, and septic and sewer are major areas of the exam outline. Candidates should give these subjects consistent study time and become comfortable using the International Plumbing Code, International Fuel Gas Code, and other references. Hydronics and fire sprinklers are also important because the reference list includes Modern Hydronic Heating and NFPA sprinkler standards.

Because the exam has 100 questions and a 240-minute time limit, candidates should prepare for both accuracy and pacing. Some questions may be answered from field knowledge, while others may require quick reference navigation. Online practice questions can help you build a rhythm for reading the question, identifying the subject, choosing the correct reference when needed, and answering efficiently.

Open Book Test

The Arizona Plumbing Residential/Commercial Contractor (CR-37) trade exam is an open-book exam. Candidates are responsible for bringing their own approved references to the examination center. The approved exam-room references include Code of Federal Regulations - 29 CFR Part 1926 (OSHA), International Fuel Gas Code, 2018, International Mechanical Code, 2018, International Plumbing Code, 2018, NFPA 13: Installation of Sprinkler Systems, 2019, NFPA 13D - Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2019, NFPA 13R - Sprinkler Systems for Residential Occupancies up to and Including Four Stories in Height, 2019, and On-site Wastewater Treatment Facility Provisions in Unified Water Quality Permit Rule, Arizona Administrative Code Title 18, Chapter 9, 2006.

The study references used for preparation include Mathematics for Plumbers and Pipefitters, 8th edition; IPT’s Pipe Trades Handbook, Robert A. Lee, 2016; Boiler Operator’s Guide, 5th Edition; Arizona 811 - Arizona Blue Stake Brochure; and Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022. These references support math, pipe trades knowledge, boiler concepts, excavation notification awareness, and hydronic heating preparation, but they are not listed here as exam-room-approved materials.

Open-book testing can help prepared candidates, but it does not replace study. The exam time limit does not allow unlimited searching. Candidates should know where to find plumbing code provisions, fuel gas requirements, mechanical code topics, sprinkler standards, wastewater rules, OSHA safety information, and core plumbing concepts before test day.

Reference materials may be highlighted, underlined, annotated, and indexed before the examination session. References may not be written in during the exam. Additional loose or attached papers are not permitted with approved references. Permanent tabs are allowed. Temporary removable tabs are not allowed. Candidates may use a silent, nonprinting, non-programmable calculator in the examination center.

Licensing Steps

Arizona contractor licensing is handled through the Arizona Registrar of Contractors. Applicants should begin by selecting the correct license classification for the work they plan to perform. For plumbing work in both residential and commercial settings, the relevant classification is CR-37 Plumbing Residential/Commercial.

After selecting the correct classification, candidates should review the examination requirements tied to that license. The CR-37 trade exam is one part of the licensing process. Contractor applicants may also need to complete the Arizona business management or statutes and rules requirement, application requirements, qualifying party requirements, bonding requirements, experience requirements, and other items required by the Arizona Registrar of Contractors.

A practical licensing plan separates exam preparation from application preparation. Exam preparation focuses on plumbing code, fuel gas code, mechanical code, DWV systems, water supply, fixtures, backflow, storm drainage, septic and sewer, hydronics, fire sprinklers, excavation, pipe trades math, and OSHA safety. Application preparation focuses on state forms, business structure, qualifying party information, bond requirements, fees, and supporting documents.

Using online practice questions during the exam preparation phase gives structure to your study time. Questions help reveal which subjects are already familiar and which ones need more review. This makes it easier to use the 3-month access period productively and keeps preparation focused on the subjects most closely tied to the CR-37 plumbing exam outline.

State Requirements

The Arizona Registrar of Contractors issues contractor licenses by classification. Commercial classifications apply to commercial work, residential classifications apply to residential work, and dual classifications may apply when a contractor qualifies for both commercial and residential work. The CR-37 classification is the residential/commercial plumbing contractor classification.

The plumbing classification includes installation, alteration, and repair of plumbing within property lines. This may include piping, fixtures, appliances, water supply systems, pressure vessels and tanks excluding municipal systems, venting and sanitary drainage systems, septic tanks, leaching lines, roof leaders, lawn sprinkler systems, water conditioning equipment, and piping and equipment for swimming pools.

The classification may also include piping for gas, compressed air, vacuum, petroleum, fuel oil, non-potable liquids, hot water heating systems, steam systems within classification limits, water cooling systems excluding refrigerant piping and equipment, and testing and balancing of hydronic systems. Plumbing work may also involve sewer, gas, and water lines to the nearest public supply or disposal system when performed within the limits allowed by the classification.

Residential/commercial plumbing contractors should understand where the classification begins and ends. Work outside the license classification may require another properly licensed contractor. Passing the trade exam is not the same as receiving a license. Applicants are responsible for meeting the full Arizona licensing requirements that apply to the classification, qualifying party, business entity, bond, application, and related state requirements.

Reference Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Used to review federal construction safety standards, including excavation safety, personal protective equipment, ladders, tools, equipment, hazard recognition, material handling, and jobsite safety practices.
• International Fuel Gas Code, 2018
  Used to review fuel gas piping, appliance connections, combustion air, venting, equipment installation, gas pressure, sizing, and safety requirements.
• International Mechanical Code, 2018
  Used to review mechanical system provisions that connect to plumbing work, fuel-burning appliances, hydronic topics, ventilation, piping-related conditions, and mechanical code requirements.
• International Plumbing Code, 2018
  The primary plumbing code reference for DWV systems, water supply, fixtures, traps, interceptors, indirect waste, storm drainage, backflow, water heaters, and plumbing system requirements.
• NFPA 13: Installation of Sprinkler Systems, 2019
  A fire sprinkler standard used to study sprinkler system installation requirements, components, piping, protection methods, and system design concepts for applicable occupancies.
• NFPA 13D - Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2019
  A residential sprinkler standard used to review sprinkler systems for one- and two-family dwellings and manufactured homes.
• NFPA 13R - Sprinkler Systems for Residential Occupancies up to and Including Four Stories in Height, 2019
  A sprinkler standard used to review residential occupancy sprinkler systems up to and including four stories in height.
• On-site Wastewater Treatment Facility Provisions in Unified Water Quality Permit Rule, Arizona Administrative Code Title 18, Chapter 9, 2006
  Used to review Arizona on-site wastewater treatment facility provisions, septic-related requirements, wastewater rules, and related system topics.
• Mathematics for Plumbers and Pipefitters, 8th edition
  A study reference for plumbing and pipefitting math, calculations, formulas, measurements, pipe trades problem solving, and field math preparation.
• IPT’s Pipe Trades Handbook, Robert A. Lee, 2016
  A study reference for pipe trades information, piping materials, fittings, measurements, formulas, valves, field data, and practical piping knowledge.
• Boiler Operator’s Guide, 5th Edition
  A study reference used to review boiler principles, hydronic and steam-related concepts, equipment operation, safety, controls, and heating system awareness.
• Arizona 811 - Arizona Blue Stake Brochure
  A study reference used for excavation notification awareness, underground utility damage prevention, digging safety, and Arizona Blue Stake concepts.
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022
  A study reference for hydronic heating systems, piping layouts, heat transfer, pumps, boilers, controls, system components, and residential or light commercial hydronic design concepts.

Exam Room Approved Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Approved for use during the exam and used for construction safety, excavation, personal protective equipment, tools, access, equipment, and jobsite hazard questions.
• International Fuel Gas Code, 2018
  Approved for use during the exam and used for fuel gas piping, appliances, combustion air, venting, sizing, gas pressure, installation, and fuel gas safety topics.
• International Mechanical Code, 2018
  Approved for use during the exam and used for mechanical provisions connected to plumbing, fuel-burning equipment, ventilation, hydronic topics, and system requirements.
• International Plumbing Code, 2018
  Approved for use during the exam and used for DWV systems, water supply, fixtures, traps, interceptors, indirect waste, storm drainage, backflow, and plumbing code questions.
• NFPA 13: Installation of Sprinkler Systems, 2019
  Approved for use during the exam and used for fire sprinkler system installation requirements, piping, components, and system protection concepts.
• NFPA 13D - Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2019
  Approved for use during the exam and used for residential sprinkler systems serving one- and two-family dwellings and manufactured homes.
• NFPA 13R - Sprinkler Systems for Residential Occupancies up to and Including Four Stories in Height, 2019
  Approved for use during the exam and used for sprinkler systems serving residential occupancies up to and including four stories in height.
• On-site Wastewater Treatment Facility Provisions in Unified Water Quality Permit Rule, Arizona Administrative Code Title 18, Chapter 9, 2006
  Approved for use during the exam and used for Arizona on-site wastewater treatment facility provisions, septic-related requirements, and wastewater system topics.

Test Information and Study Materials

The Arizona CR-37 exam requires preparation across plumbing code, fuel gas, mechanical code, sprinkler standards, wastewater provisions, hydronic systems, excavation, math, and field practices. Candidates should study the full reference list because the exam includes both code-based questions and practical trade knowledge.

Drain-waste-vent preparation should include pipe sizing, vents, traps, cleanouts, horizontal and vertical drainage, fixture connections, slope, drainage fittings, sanitary system layout, and code requirements. DWV is one of the largest exam areas and should be reviewed carefully in the International Plumbing Code.

Water supply and backflow preparation should include potable water distribution, pipe sizing, fixture supply, pressure considerations, protection of the potable water system, backflow prevention devices, cross-connection control, water heaters, valves, and system testing. Candidates should understand both code requirements and practical installation conditions.

Fuel gas preparation should include gas piping, sizing, appliance connections, combustion air, venting, regulators, pressure, shutoff valves, equipment installation, and safety. The International Fuel Gas Code is a key reference for this subject, and candidates should become familiar with its organization before test day.

Fire sprinkler preparation should include the differences between NFPA 13, NFPA 13D, and NFPA 13R applications, sprinkler piping, system components, residential sprinkler concepts, installation conditions, and system protection requirements. Hydronic preparation should include boilers, pumps, piping layouts, heat transfer, controls, expansion tanks, balancing, and system operation.

Septic, sewer, wastewater, and excavation preparation should include sewer connections, on-site wastewater provisions, trenching, backfill, pipe support, safety, Arizona Blue Stake awareness, underground utility protection, and OSHA excavation requirements. Plumbing contractors often perform or coordinate underground work, making excavation safety and utility awareness important.

Online practice questions help candidates move from passive reading to active recall. When you miss a question, use it as a signal for what to review next. Return to the related code book, safety reference, sprinkler standard, wastewater rule, hydronic reference, or pipe trades study material, then practice again until the material becomes more familiar.

For open-book preparation, organize approved references before test day. Highlight important sections, use approved permanent tabs, and practice locating information while answering questions. The goal is not to search every answer from scratch. The goal is to understand the plumbing topics well enough to answer efficiently and use the references when they are most helpful.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Arizona contractor candidates prepare with organized study guidance, trade-focused review, and practice-oriented exam preparation. For the Arizona Plumbing Residential/Commercial Contractor (CR-37) exam, that means supporting your study routine with questions connected to DWV systems, water supply, backflow, fixtures, fuel gas, mechanical code, sprinkler systems, wastewater provisions, septic and sewer, hydronics, excavation, pipe trades math, and OSHA safety.

Many experienced plumbers understand field work but still need support with the testing format. Contractor exams require careful reading, time management, code navigation, and the ability to connect each question to the correct trade concept or approved reference. Online practice questions help you become more comfortable with that process before exam day.

1 Exam Prep helps candidates study with structure instead of guessing what to review next. Practice questions can reveal weak areas, guide reference review, and reinforce the subjects most closely connected to the exam outline. This helps you use your 3-month access period effectively and keeps preparation focused.

For open-book exams, 1 Exam Prep also supports better reference navigation. Approved books are valuable, but they are most helpful when you know how to use them quickly. Practice-based study can help you learn when to use the International Plumbing Code, when to check the International Fuel Gas Code, when to review NFPA sprinkler standards, when to use OSHA, and when to study hydronic or pipe trades topics during preparation.

This product is designed to support confidence through preparation. It does not guarantee a passing score, license approval, or any state outcome. It gives you a practical way to study, review, and strengthen your understanding before taking the Arizona CR-37 Plumbing Residential/Commercial Contractor exam.

FAQ Section

Who is this product for?

This product is for candidates preparing for the Arizona Plumbing Residential/Commercial Contractor (CR-37) trade exam who want online practice questions and 3 months of access for self-paced study.

How long do I get access?

This product includes 3 months of access. During that period, you can work through online practice questions, review missed topics, and continue studying at your own pace.

Is the Arizona CR-37 exam open book?

Yes. The Arizona CR-37 Plumbing Residential/Commercial Contractor trade exam is open book and allows approved references into the examination center.

Which books are allowed into the exam room?

The approved references include OSHA 29 CFR Part 1926, International Fuel Gas Code 2018, International Mechanical Code 2018, International Plumbing Code 2018, NFPA 13 2019, NFPA 13D 2019, NFPA 13R 2019, and Arizona on-site wastewater treatment facility provisions.

Are the math, pipe trades, boiler, Blue Stake, and hydronic references allowed in the exam room?

These references are included as study materials for preparation, but they are not listed here as exam-room-approved materials for the Arizona CR-37 trade exam.

How many questions are on the Arizona CR-37 exam?

The Arizona CR-37 Plumbing trade exam includes 100 questions.

How much time is allowed for the exam?

The exam allows 240 minutes.

What score is needed to pass?

The minimum passing score is 70%.

What subjects are covered on the exam?

The exam covers DWV systems, indirect waste, water supply, backflow, roof drains and storm drainage, plumbing fixtures, water heaters, accessibility, general knowledge, specialty plumbing, fuel gas, septic and sewer, hydronics, fire sprinklers, and excavation.

What is the difference between C-37 and CR-37?

The C-37 classification is commercial, while the CR-37 classification is residential/commercial. The CR-37 path is for contractors preparing to perform plumbing work in both residential and commercial settings within the allowed license scope.

Does this product include physical books?

This product is for online practice questions and includes 3 months of access. Physical books are not listed as included with this product.

Can online practice questions help with an open-book plumbing exam?

Yes. Practice questions can help improve topic recognition, code navigation, timing, reference use, and comfort with plumbing contractor exam wording before test day.