Free practice questions for Arizona's R-37R Residential Plumbing trade exam — 100 questions on the 2018 IPC and IFGC — with a written explanation on every answer, in English, Spanish, and Russian.
8 questions, about 4 minutes. No account needed — pick an answer to see whether it's right and read the explanation, the same explanations you get on every question in the full course.
Practice across the full question bank.
Understand why the correct answer works — not just which letter is right.
Spend more time on the questions you miss.
Practice under exam-style time pressure before exam day.
Every question tells you why the correct answer is correct and defines the terms it uses — so you learn the rule, not just the answer.
Questions are written from scratch against the official codes and agency publications for this exam — never copied from the real exam.
Every question and explanation is fully translated, with the English exam term kept alongside — not a shallow machine translation.
LICENA is a practice tool, not a school. We don't promise a pass — we help you understand the material and walk in prepared.
The full Arizona R-37R course is 500 questions across 5 blocks written to the exam's own references — the 2018 International Plumbing Code, the 2018 International Fuel Gas Code, 29 CFR 1926 Subpart P and EPA's septic materials — every answer cited to its section.
Exam structure, topics, study areas and official resources.
The R-37R Plumbing (Residential) exam is PSI's trade test for Arizona's residential plumbing license: 100 questions, 240 minutes, 70 percent to pass, open book. Its reference list is led by the 2018 International Plumbing Code and the 2018 International Fuel Gas Code, with OSHA's 1926 alongside. Try the free sample above: no sign-up, with a written explanation on every question.
PSI's R-37R content outline (rev. 6/8/23) sets the format — 100 questions, 240 minutes, 70 percent, open book — and its reference list names the 2018 INTERNATIONAL Plumbing Code and the 2018 International Fuel Gas Code. That first word matters: several states test the Uniform Plumbing Code instead, and the two books number everything differently. Study to the exam's own list, tab your books before test day (writing in them is not allowed), and remember code questions are based on the listed 2018 editions, not the newest ones.
Residential plumbing exams live on the DWV-and-supply spine: trap seals of 2 to 4 inches, drainage slope by pipe size from Table 704.1, cleanouts at 100-foot intervals and at the building drain's junction, venting with its roof-termination and frost rules, water-service sizing with its 3/4-inch floor, water heaters with their T&P relief valves discharging through an air gap in the same room, and backflow protection at every cross-connection. The IFGC adds gas pipe sizing, the appliance shutoff valve in the same room within 6 feet, testing and purging, and appliance venting. Expect applied questions — a size, a distance, a slope — more than definitions.
R-37R covers residential plumbing; commercial work requires C-37 or the dual CR-37. Around the pipe itself the exam reaches the jobsite: OSHA's Subpart P excavation rules (protective systems at 5 feet, spoils back 2 feet, egress within 25 feet of lateral travel), and the septic basics EPA publishes — how tanks and drainfields work. Every Arizona license also requires the SRE, AZ ROC's separate open-book law exam; budget for both preparations.
The full LICENA course is 500 questions in five blocks, every answer explained with its IPC or IFGC citation. At 30 questions a day that is under three weeks: a first pass to find what you do not know, a second on the weak blocks, then the timed final mirroring the real 100-question, 240-minute format. Open book rewards navigation — knowing that traps live in Chapter 10, slope in Table 704.1, relief valves in 504 — and drilling builds that map faster than rereading chapters. Pair the bank with the Arizona SRE practice (also required) and our guide to Arizona's contractor exams.
Try the full bank free for 3 days — no card needed. Then $9.99 for your first month and $19.99/month after that if you decide to continue, cancel anytime — far less than the hundreds a trade school costs, and you study on your phone, in your language, whenever you have a few minutes.
Continue Arizona R-37R practice The free sample above stays free. Creating an account is free — no card needed.LICENA gives you practice questions to study with. We are not an accredited school and we do not guarantee that you will pass any exam.
LICENA provides online practice only. Registration, testing and licensing are handled by the Arizona Registrar of Contractors (AZ ROC) and PSI — not by LICENA. LICENA is not affiliated with AZ ROC or PSI.