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100+ Free NRPP RMI Practice Questions

Pass your NRPP Radon Mitigation Installer (RMI) Certification Exam exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: NRPP RMI Exam

95

Exam questions (85 scored + 10 unscored trial items) since Oct 1, 2024

NRPP

2 hours

Time limit on the live remote-proctored Certiverse exam

NRPP

30%

Exam weight of the Implement Mitigation Installation domain, the largest

NRPP RMI blueprint

$125

Exam fee, plus a $250 initial certification fee

NRPP

2 years

Certification cycle, renewed with 8 continuing-education credits

NRPP

4

Maximum exam attempts per 12-month period, with 30-day waits between attempts

NRPP

2023

Edition year of the ANSI/AARST SGM-SF and MAH standards the exam references

AARST Standards

The NRPP RMI exam certifies entry-level radon mitigation installers who work under a Certified Radon Mitigation Specialist in the same company. You get 2 hours for 95 multiple-choice questions; 85 count toward your score and 10 are unscored trial items. The blueprint weights six job domains: implementing the mitigation installation is heaviest at 30% (sub-slab and sub-membrane depressurization, fan and vent piping, sealing, labeling), followed by identifying radon entry points (17%), post-installation tasks such as manometer setup, verification, and documentation (17%), jobsite safety covering electrical work, ladders, confined crawlspaces, and silica dust (15%), client communication (14%), and ethics (7%). Questions reference ANSI/AARST SGM-SF-2023 and MAH-2023, which the Certiverse platform provides during the exam. The exam costs $125 with a $250 initial certification fee, allows 4 attempts per 12 months with 30-day waits, and the credential renews every 2 years with 8 CE credits. Several licensing states do not accept the RMI, so check state rules first.

Sample NRPP RMI Practice Questions

Try these sample questions to test your NRPP RMI exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An RMI arrives at an occupied home to install a sub-slab depressurization system designed by the supervising Radon Mitigation Specialist. Before starting any work, what should the installer review with the client?
A.The results of the client's most recent medical checkup
B.The scope of work, the areas of the home the crew will need to access, and the expected work schedule
C.The detailed pressure field extension data from the diagnostic visit
D.The chemical composition of the soil beneath the foundation
Explanation: Good client communication starts with confirming the scope of work, access areas, and schedule so the occupants know what to expect; this is part of the RMI exam's 'communicate with client' domain (about 14% of the test).
2Under ANSI/AARST SGM-SF-2023, what must the contractor provide to the client at the completion of a radon mitigation installation?
A.A notarized affidavit filed with the county recorder
B.A copy of the supervising specialist's certification exam score report
C.An information package labeled 'Radon Mitigation Information' (or similar) covering operation, maintenance, and monitoring of the system
D.A lifetime warranty certificate covering all future radon levels
Explanation: SGM-SF-2023 requires an information package, labeled 'Radon Mitigation Information' or similar wording, that prominently includes the essentials for operation, maintenance, and monitoring (OM&M), attached to the system in a visible location or otherwise provided to the client.
3While demonstrating the new system, the installer shows the client the u-tube manometer on the vent pipe. Which condition should the installer explain indicates the fan is operating and creating suction?
A.The colored fluid columns rest at unequal heights
B.The colored fluid columns rest at exactly equal heights
C.The fluid has completely drained out of the tube
D.The fluid bubbles continuously while the fan runs
Explanation: A u-tube manometer measures the pressure difference in the vent pipe; when the fan is running and pulling a vacuum, the fluid columns are displaced to unequal heights. Equal levels mean no pressure difference, i.e., the fan is off or has failed.
4A client asks what they should do if, months after installation, the manometer fluid levels become equal. What is the correct guidance?
A.Add more fluid to the manometer until the columns separate again
B.Open the basement windows to ventilate until the gauge recovers
C.Remove and clean the fan impeller themselves
D.Contact the mitigation contractor because the fan has likely stopped working and needs service
Explanation: Equal manometer levels mean the system has lost suction, which almost always indicates fan failure or a major blockage; the client should call the mitigation contractor for service rather than attempt repairs.
5After a successful mitigation, how often does the U.S. EPA recommend the home be retested for radon under normal conditions?
A.Every 6 months
B.At least every 2 years
C.Every 10 years
D.Only when the home is sold
Explanation: EPA guidance, echoed in the OM&M instructions required by SGM-SF-2023, is to retest mitigated homes at least every two years, and also after significant building or HVAC changes, to confirm the system is still performing.
6A client asks whether they can switch the radon fan off at night to save electricity. What is the correct response?
A.Yes, radon levels are always lower at night, so nighttime shutdowns are safe
B.Yes, as long as the fan runs at least 8 hours per day
C.No, an active soil depressurization fan is designed to run continuously; turning it off allows radon to re-enter the home
D.No, because restarting the fan voids the manufacturer's warranty
Explanation: ASD systems only control radon while the fan maintains a negative pressure field under the slab or membrane; the fan must run continuously. Typical radon fans draw modest power, so operating cost is low.
7During the final walkthrough, a client asks the installer to guarantee the system will bring the home to zero radon. What is the most professional and accurate response?
A.Promise zero radon, since modern fans remove all soil gas
B.Explain that no system can eliminate radon entirely; the goal is to reduce levels below the EPA action level of 4.0 pCi/L and as low as reasonably achievable
C.Decline to discuss expected results because predictions are the client's responsibility
D.Tell the client radon guarantees are illegal in every state
Explanation: Radon occurs naturally outdoors (ambient air averages roughly 0.4 pCi/L), so zero is impossible. Honest communication is to state the system targets levels below 4.0 pCi/L, ideally lower, verified by a post-mitigation test.
8While installing the system, the installer discovers that the planned vent pipe route is blocked by ductwork that was not visible during the design visit. The client suggests an alternate route through a bedroom closet. What should the RMI do?
A.Consult the supervising Radon Mitigation Specialist before deviating from the designed routing
B.Follow the client's suggestion immediately since the client owns the home
C.Abandon the job and refund the client
D.Install the pipe with a horizontal low spot to bypass the ductwork
Explanation: An RMI works under the general supervision of a certified RMS in the same company; significant design changes, such as rerouting the vent stack, must be cleared with the supervising specialist who is responsible for the system design.
9A client asks roughly how much electricity the new radon fan will use. Which answer reflects typical in-line radon fans used in single-family ASD systems?
A.About the same as a central air conditioner
B.About the same as an electric water heater
C.Roughly 1,500 to 2,000 watts of continuous draw
D.Roughly 20 to 90 watts of continuous draw, comparable to a light bulb
Explanation: Common residential radon fans draw on the order of 20-90 watts depending on the model, so continuous operation typically costs only a few dollars per month, a key point for honest client communication about operating costs.
10Before drilling through the basement slab, what should the installer communicate to the occupants about the work environment?
A.Occupants must vacate the home for 72 hours after drilling
B.There will be temporary noise and dust, the crew will use dust controls, and children and pets should be kept clear of the work area
C.The home's electricity will be shut off for the entire day
D.Nothing, because describing hazards unnecessarily alarms clients
Explanation: Professional communication includes warning occupants about noise and dust from coring or hammer-drilling, describing the dust controls the crew will use, and asking that children and pets stay out of the work area for safety.

About the NRPP RMI Exam

The NRPP Radon Mitigation Installer (RMI) is the entry-level national credential for staff who install radon (soil depressurization) systems in residences while working under the general supervision of a Certified Radon Mitigation Specialist within the same company. The exam contains 95 multiple-choice questions (85 scored plus 10 unscored trial items) delivered in 2 hours through Certiverse live remote proctoring. Content is built on the ANSI/AARST SGM-SF-2023 soil gas mitigation standard and the MAH-2023 measurement protocol, both of which candidates can access inside the exam platform. Certification renews on a 2-year cycle with 8 continuing-education credits. Note that some licensing states (including CA, CO, FL, IL, OH, and PA) may not accept this credential, so candidates should verify state requirements.

Questions

95 scored questions

Time Limit

2 hours

Passing Score

Not published (criterion-referenced passing point on 85 scored questions)

Exam Fee

$125 exam; $250 initial certification fee (National Radon Proficiency Program (NRPP) / AARST-Indoor Environments Association, delivered via Certiverse live online proctoring)

NRPP RMI Exam Content Outline

30%

Implement Mitigation Installation

Sub-slab and sub-membrane depressurization installation: coring and suction pits, airtight slab sealing, sump and drain-tile suction with gasketed lids, fan placement outside occupiable space, Schedule 40 PVC piping sloped to drain condensate, discharge at least 12 inches above the roof and 10 feet from openings, and 'Radon Reduction System' labels at each floor level plus marked disconnects and breakers per SGM-SF-2023.

17%

Identify Radon Entry Points

Radon fundamentals (radium decay source, 3.8-day half-life, lung cancer risk, 4.0 pCi/L EPA action level), pressure-driven soil-gas entry and stack effect, and recognizing entry routes: floor-wall cove joints, slab cracks and control joints, sump pits, untrapped floor drains, utility penetrations, hollow CMU walls, and exposed crawlspace soil.

17%

Post-Installation Tasks

Installing and baselining the u-tube manometer, verifying pressure field extension with smoke and micromanometer readings at test holes, checking combustion appliance drafting after startup, assembling the OM&M information package, and coordinating post-mitigation testing no sooner than 24 hours after continuous operation and initiated within 30 days.

15%

Jobsite Safety

Locating embedded utilities before slab coring, OSHA silica controls (50 ug/m3 PEL, wet methods or shrouded HEPA extraction), GFCI protection and de-energizing circuits, extension ladder rules (4:1 angle, 3 feet above the landing, three-point contact), confined crawlspace entry with PPE and check-ins, plus asbestos, rodent-dropping, heat, and noise hazards.

14%

Communicate with the Client

Pre-job briefings on scope, schedule, noise, and dust; explaining continuous fan operation, electricity cost, and how to read the manometer; delivering the Radon Mitigation Information package; setting honest expectations against the 4.0 pCi/L target; and advising retesting at least every 2 years and after building changes.

7%

Ethics & Professional Conduct

Practicing within the RMI scope under general RMS supervision in the same company, truthful credential representation (no 'EPA-certified' claims), disclosing conflicts of interest when the installer also tests, protecting client confidentiality, and refusing to falsify measurement results or documentation.

How to Pass the NRPP RMI Exam

What You Need to Know

  • Passing score: Not published (criterion-referenced passing point on 85 scored questions)
  • Exam length: 95 questions
  • Time limit: 2 hours
  • Exam fee: $125 exam; $250 initial certification fee

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

NRPP RMI Study Tips from Top Performers

1Memorize the SGM-SF-2023 discharge rules: at least 12 inches above the roof surface and at least 10 feet from windows, doors, operable skylights, and air intakes into conditioned space, including openings of adjacent buildings.
2Know the fan-location logic cold: fans go in attics, garages not below occupiable rooms, or outdoors, because a leak on the positive-pressure side must never discharge soil gas into occupiable space.
3Drill the labeling set: 'Radon Reduction System' pipe labels at each floor level, 'Radon Fan - Do Not Turn Off/Unplug' on the disconnect, and 'Radon' on the circuit breaker, plus the system label with installer contact and install date.
4For post-installation, remember the testing timeline: start no sooner than 24 hours after continuous operation, initiate within 30 days, run short-term tests at least 48 hours under closed-building conditions that begin 12 hours before the test.
5Tie safety answers to specific OSHA values: 50 ug/m3 silica PEL with wet or HEPA-shrouded drilling, 4:1 ladder angle with 3 feet of rail extension, GFCI protection for portable tools, and verified de-energization before wiring work.
6Review the radon basics that anchor the entry-points domain: radium-226 decay source, 3.8-day half-life, alpha-emitting progeny causing lung cancer, the 4.0 pCi/L EPA action level, and stack-effect-driven entry.

Frequently Asked Questions

How many questions are on the NRPP RMI exam?

Since October 1, 2024 the exam has 95 multiple-choice questions: 85 scored items worth 1 point each plus 10 unscored trial questions being evaluated for future use. You have 2 hours to complete it.

What standards is the RMI exam based on?

The exam references ANSI/AARST SGM-SF-2023 (Soil Gas Mitigation Standards for Existing Homes) and MAH-2023 (the protocol for measuring radon in homes). Candidates are given access to both standards within the Certiverse exam platform during the test.

Can a certified RMI install radon systems independently?

No. The RMI is an entry-level credential that requires working under the general supervision of a Certified Radon Mitigation Specialist (RMS) within the same company. System design and diagnostics remain the RMS's responsibility.

How much does the NRPP RMI certification cost?

The exam fee is $125 and the initial certification fee is $250. Certification renews on a 2-year cycle, which requires 8 continuing-education credits plus renewal fees.

Is the RMI credential accepted in every state?

No. Some licensing states may not accept the RMI exam, including California, Colorado, Florida, Iowa, Illinois, Kansas, Maine, Nebraska, Ohio, Pennsylvania, and Minnesota. Check your state radon program's licensing requirements before scheduling.

How is the RMI exam delivered?

Through Certiverse live online proctoring. You present government-issued photo ID, complete a 360-degree room scan, and test under continuous proctor observation. You must schedule within 30 days of purchasing the exam.

What happens if I fail the RMI exam?

You must wait 30 days between attempts, and you are limited to 4 attempts in any 12-month period. Results are provided when you finish, so you will know your domain-level performance for retake studying.

What is the heaviest topic on the RMI exam?

Implementing the mitigation installation, at 30% of the exam. It covers sub-slab and sub-membrane depressurization, fan and vent piping installation, sealing entry routes, and the SGM-SF-2023 labeling requirements.