Virginia Residential Plumber

Virginia Residential Plumber Exam: Complete 2026 Study Guide

The Virginia residential plumber exam is a 50-question, open-book test administered by PSI Exams. Passing it earns you a Residential Plumber Tradesman license — the credential required to legally perform plumbing work on residential structures in Virginia. This guide covers exactly what's on the exam, what references to bring, how to prepare efficiently, and what to expect on test day. If you want to benchmark your readiness right now, start with our free practice exam.

Exam Overview

The Virginia Residential Plumber exam is delivered by PSI at licensed test centers across the state. Here are the core facts:

• Scored questions: 50
• Time limit: 120 minutes
• Passing score: 35 out of 50 (70%)
• Format: Open book — you must bring your own references
• Exam fee: $85 at PSI registration (non-refundable, valid for one year from payment date; the July 2026 bulletin's fee table still lists $100)

A small number of experimental (unscored) questions may also appear — typically around 10% of total questions administered. These do not count toward your score, but you won't be able to identify them during the exam, so treat every question the same.

Before scheduling, you must receive Board approval of your application. Once approved, register through PSI's exam registration page (available 24/7) or call PSI at (855) 340-3910. Full scheduling hours and exam location details are in the official exam bulletin.

Topics Covered on the Virginia Residential Plumber Exam

The exam draws from twelve topic areas. The item counts below reflect their weight on the real exam — this is where to direct your preparation time.

Drainage Waste and Vents (12 items) — The single heaviest topic. Expect questions on drainage fixture unit (DFU) values, horizontal drain slope, cleanout placement, pipe joint methods by material, and vent types including air admittance valves.

Water Supply Systems (8 items) — Covers pipe materials, pressure requirements, pressure-reducing valves, and potable water protection.

Backflow Prevention (6 items) — Cross-connection control, backflow preventer device types, air gap dimensions, vacuum breaker installation heights, and IPC Table 608.1.

Storm Drainage Systems (4 items) — Rainfall rate determination, storm drain sizing, approved pipe materials, roof drain flow calculations, and secondary/emergency drain sizing.

Plumbing Fixtures (4 items) — Minimum fixture counts by occupancy, clearance requirements, accessible fixture standards (ICC A117.1), and shower valve temperature limits.

General Regulations (4 items) — Permit requirements, inspection stages (underground, rough-in, final), testing requirements, and pipe protection from freezing and physical damage.

Interceptors and Traps (4 items) — Trap dimensions, prohibited trap types, trap seal depth, grease interceptor sizing, and oil separator requirements.

Standards of Practice (3 items) — Contractor license classes (A, B, C), prohibited acts, grounds for license denial/suspension/revocation, exemptions, and written contract requirements.

Standards of Conduct (2 items) — Disciplinary grounds, reporting requirements for convictions, prohibition on license transfer, and contract abandonment.

Renewal and Reinstatement (1 item) — License expiration periods, continuing education requirements, renewal fees, and grounds for denial.

Definitions (1 item) — IPC Chapter 2 terminology for drainage, water supply, and venting systems, plus Virginia-specific definitions.

Qualification for Licensure (1 item) — Education and experience requirements for residential plumber, journeyman, and master plumber licensure, including documentation standards.

Sample Questions

The following five questions are drawn from actual exam topic areas. Work through them — but note that the correct answers are not provided here. Take our free practice exam to check your reasoning.

Question 1 — Storm Drainage Systems (Medium)

For what flow rate must the SECONDARY (emergency overflow) drainage be sized? (Figure RS-4)

• A) 59.3 gpm
• B) 88.9 gpm
• C) 134.2 gpm
• D) 118.6 gpm

This tests your ability to read a storm drainage figure and apply the correct sizing formula for emergency overflow systems — a calculation question that rewards knowing exactly where to look in the IPC.

Question 2 — Drainage Waste and Vents (Hard)

You are a plumbing contractor installing a horizontal drain in a commercial building. The drain has a change of horizontal direction of 60 degrees, then another change of 50 degrees occurring 30 feet downstream from the first change. How many cleanouts are required for these two changes of direction?

• A) Two cleanouts — one at each change of direction
• B) One cleanout — installed at the first change of direction, which serves both changes within 40 feet
• C) No cleanout is required for changes of direction less than 90 degrees
• D) Three cleanouts — one at each change plus one at the midpoint

This requires precise knowledge of IPC cleanout spacing rules — not intuition. The answer depends on how the code aggregates directional changes within a given distance.

Question 3 — Renewal and Reinstatement (Easy)

How many hours of continuing education must an individual holding a tradesman license with an electrical designation complete as a condition of renewal or reinstatement?

• A) 1 hour
• B) 3 hours
• C) 8 hours
• D) 16 hours

A regulatory lookup question. The answer is in the Virginia Board for Contractors regulations.

Question 4 — Water Supply Systems (Medium)

According to the International Plumbing Code, what is the maximum developed length allowed from a 2-inch fixture trap to its protecting vent fitting, assuming a slope of ¼ inch per foot?

• A) 6 feet
• B) 5 feet
• C) 8 feet
• D) 12 feet

Tests your ability to use the IPC trap arm length table — you need to locate the correct table, find the 2-inch row, and read the ¼-inch slope column accurately.

Question 5 — Drainage Waste and Vents (Hard)

Using the printed formula, what is the TRUE OFFSET of the rolling offset? (Figure PR-4)

• A) 8-15/16 in
• B) 6 in
• C) 8 in
• D) 12 in

A geometry-based calculation requiring you to apply a rolling offset formula from a figure. Speed matters here — you need to locate the figure and formula without burning excess time.

What Types of Questions to Expect

Our question pool contains 320 practice questions distributed across all twelve exam topics. Here's what each area tests and how many practice questions we've built for it:

• Drainage Waste and Vents (90 practice questions): DFU values, drain slope compliance, cleanout placement and clearance, pipe joint methods by material (ABS, PVC, cast iron, copper), and vent type identification. Expect calculation and code-lookup questions.
• Water Supply Systems (65 practice questions): Pipe material standards, water service installation, pressure calculations, PRV selection, and potable water protection rules.
• Backflow Prevention (30 practice questions): Device type identification, hazard classification, air gap minimums, vacuum breaker installation heights, and Table 608.1 lookups.
• Plumbing Fixtures (28 practice questions): Minimum fixture counts by occupancy, clearance and spacing requirements, accessible fixture standards, and shower valve temperature limits.
• General Regulations (28 practice questions): Permit application procedures, code official authority, inspection stage sequencing, and system testing requirements.
• Standards of Practice (14 practice questions): License class distinctions (A, B, C), prohibited acts, grounds for denial or revocation, exemptions, and written contract rules.
• Interceptors and Traps (20 practice questions): Trap arm dimensions, prohibited trap configurations, trap seal depth, grease interceptor capacity sizing, and oil separator locations.
• Storm Drainage Systems (22 practice questions): Rainfall intensity data, pipe sizing tables, approved materials, roof drain flow rate equations, and secondary drain sizing.
• Standards of Conduct (8 practice questions): Disciplinary grounds, reporting obligations for convictions and suspensions, and contract abandonment rules.
• Renewal and Reinstatement (5 practice questions): Expiration schedules, CE hour requirements, renewal fees, and denial grounds.
• Definitions (5 practice questions): IPC Chapter 2 terminology — drainage, supply, and venting system terms — plus Virginia-specific plumbing definitions.
• Qualification for Licensure (5 practice questions): Experience and education thresholds for residential plumber, journeyman, and master plumber designations.

Required Study Materials

The Virginia Residential Plumber exam is open book, and the approved references are specified by the Board. You must bring your own — they are not provided at the test site.

Required References:

1. IPC 2021 — International Plumbing Code, 2021 Edition: This is the primary technical reference for the exam. The majority of scored questions — covering drainage, venting, water supply, backflow prevention, storm drainage, fixtures, interceptors, and traps — come directly from this code. Familiarity with its table structure and index is essential.

2. Virginia Board for Contractors, Individual License and Certification Regulations: Required for all tradesman examinations. This covers Standards of Practice, Standards of Conduct, Renewal, and Qualification for Licensure. Available from the Virginia DPOR state licensing website.

Recommended Study Supplies:

1. Redi-Tag Permanent White Tabs: Adhesive laser-printable tabs that let you create a custom index in your IPC. Each pack includes 375 tabs (25 per sheet, 15 sheets). Tab every major table — DFU values, trap arm lengths, backflow preventer types, storm drain sizing — so you can locate them in seconds during the exam.

2. Sharpie Highlighters: A 12-pack in assorted fluorescent colors. Color-code your references by topic — for example, yellow for drainage tables, pink for backflow requirements. The chisel tip works well for both broad highlighting and underlining specific code text. Note: highlighting and underlining are permitted in your exam references; writing in them is not.

Study Tips for the PSI Residential Plumber Exam Virginia

Tab and highlight before anything else. On an open-book exam, the candidates who pass fastest are the ones who can locate any table or section in under ten seconds. Buy the IPC 2021, tab every major table, and drill your index navigation until it's automatic. That retrieval speed is the real skill being tested.

Use a two-pass strategy during the exam. Work through all 50 questions once: answer the ones you know confidently, and flag the ones you're unsure about. Return to flagged questions on your second pass. Our practice platform supports bookmarking questions for review — the same workflow you'll use on test day. Don't let a single difficult question consume five minutes of your 120-minute limit.

Allow three to six weeks of structured preparation. Use the official exam bulletin as your topic roadmap. Prioritize Drainage Waste and Vents (12 items) and Water Supply Systems (8 items) first — they represent 40% of the scored exam. Aim for consistent 80%+ scores on practice tests before scheduling; that margin gives you a buffer above the 70% passing threshold.

Practice under timed conditions. Clock anxiety is real. Running timed practice exams builds pacing discipline so the 120-minute limit feels familiar, not urgent, on test day.

Frequently Asked Questions

How many questions are on the Virginia Residential Plumber exam?
The exam contains 50 scored questions. A small number of experimental (unscored) questions — typically around 10% of total questions administered — may also appear. These do not affect your score.

How long do I have to complete the exam?
You have 120 minutes.

What is the passing score?
You must answer 35 of 50 scored questions correctly (70%).

How much does the exam cost?
The fee is $85 when you register through PSI's system; the July 2026 bulletin's fee table still lists $100. It is non-refundable, non-transferable, and valid for one year from the payment date.

How do I register?
Register online at the exam registration page (available 24/7) or call PSI at (855) 340-3910. Phone hours: Monday–Friday 7:30 am–10:00 pm ET; Saturday–Sunday 9:00 am–5:30 pm ET. You must have Board approval before scheduling.

Is the exam open book?
Yes. You must bring your own references — none are provided. Highlighting, underlining, and permanent tabs are permitted. Writing in references and loose or unbound papers are not permitted.

What references are allowed?
The approved technical reference is the IPC 2021. You should also bring the Virginia Board for Contractors Individual License and Certification Regulations.

What ID do I need?
One valid, government-issued photo ID with your signature — driver's license, passport, military ID, or state identification card. The name must match your registration exactly.

How soon can I retake the exam if I fail?
You cannot retest on the same day. Depending on availability, retesting may be possible within two business days.

What if I need to cancel or reschedule?
You may cancel or reschedule without losing your fee if PSI receives notice at least two days before your scheduled appointment. Contact PSI by phone or through the PSI website — voicemail and email are not accepted for cancellations.

Start Preparing Today

The Virginia Residential Plumber exam is achievable with structured preparation and a well-tabbed IPC. Candidates who practice under timed, exam-like conditions consistently score higher. Begin with our free practice exam — no account required — to gauge your baseline. When you're ready for full-length, timed simulation with topic-by-topic score breakdowns, the full practice exam mirrors the real test exactly: 50 questions, 120 minutes, same topic weighting. Good preparation is methodical. Start now.