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How to Choose a Radon Mitigation Company in Greenville, SC
This guide explains how to choose a radon mitigation company in Greenville, SC. It uses EPA's contractor checklist and the national certification programs' own published requirements. It does not rank or recommend specific companies. Use it to compare any bids you get, including ours.
Step 1: Know what the certifications mean
SC DES recommends hiring a mitigation contractor certified by one of the two national programs. EPA's Consumer's Guide adds that, where a state doesn't regulate radon services, you should ask whether the contractor holds a proficiency or certification credential and follows industry consensus standards.
| AARST-NRPP Radon Mitigation Specialist | NRSB Radon Reduction Specialist (RRS) | |
|---|---|---|
| Who runs it | National Radon Proficiency Program, run by AARST (American Association of Radon Scientists and Technologists) | National Radon Safety Board |
| Training | 32-hour course (revalidated program, 2026) | 16-hour measurement course plus 24-hour mitigation course, or a combined 40-hour course |
| Exam | 160-item exam | 125 multiple-choice questions, 70% to pass |
| Other | Hands-on field experience; code of ethics and QA/QM attestation | Submits copies of customer guarantees/warranties |
| Keeping it | Recertify every 2 years with 24 hours of continuing education, including a 4-hour review of the mitigation standard | 8 continuing-education credits per renewal year |
Requirements change. Check the current rules on nrpp.info and nrsb.org.
NRPP also has a separate Mitigation Installer credential. Under the 2026 changes, installers put in systems designed by a supervising Radon Mitigation Specialist. If an installer comes to your home, it's fair to ask who designed the system.
How to verify: ask for the credential name and ID number, then look it up with the certifying program (NRPP has a professional search on nrpp.info). EPA notes private programs usually issue a photo ID card showing the credential and its expiration date.
Step 2: Get more than one estimate
Both EPA and SC DES suggest getting estimates from more than one contractor. EPA also suggests asking for references and calling some of them, and checking with your state radon office or consumer protection office.
Step 3: Ask EPA's questions
- Will you provide references or photos, plus before-and-after radon results from past jobs?
- Can you explain what the work involves, how long it takes and exactly how the system will work?
- Do you charge for diagnostic tests? EPA notes many contractors give free estimates but may charge for diagnostics.
- Did you inspect the home's structure before giving the estimate?
- Did you review my radon test results and whether proper test procedures were followed?
Step 4: Check what the proposal includes
EPA's checklist asks whether each proposal includes:
- Proof of state certification or a professional proficiency/certification credential
- Proof of liability insurance, bonding and any licenses required locally
- Diagnostic testing before design and installation
- A warning device that tells you if the system stops working (such as a manometer or alarm)
- Testing after installation
- A guarantee to reduce radon to 4 pCi/L or below, and for how long
On cost, EPA cautions that a cheaper system may cost more to run and maintain, and that material quality affects how long a system lasts. For typical price ranges, see radon mitigation cost in Upstate SC.
Step 5: Read the contract
EPA says to get a written contract before work starts and make sure it matches the proposal. It should include:
- Total cost, including taxes and permit fees, plus any deposit and when payment is due
- How long the work will take
- An agreement to get necessary permits and follow building codes
- A statement of liability insurance, bonding and insurance against injury or property damage
- Responsibility for damage and cleanup
- Details of any radon-reduction guarantee and of hardware warranties
- Whether warranties or guarantees transfer if you sell the home
- What you're expected to do before work begins
Step 6: Verify the result
SC DES says the contractor should arrange a short-term test between 24 hours and 30 days after the system starts, and SC DES can supply a post-mitigation kit on request. Retest at least every two years. The system type should match your foundation, whether that's a basement, slab or crawlspace. For background, see how radon mitigation systems work.
Ready for a quote?
Learn about radon mitigation in the Upstate. When you call, ask us the same questions above.
References: EPA, A Consumer's Guide to Radon Reduction (2016); SC DES Radon Program; AARST, The Radon Reporter, April 2026 (NRPP certification changes); National Radon Safety Board, certification requirements; NRPP.
Radon services in Greenville
Quick answers
What does NRPP certification mean?
NRPP is the National Radon Proficiency Program run by AARST. A Radon Mitigation Specialist under its current program completes a 32-hour course, passes a 160-item exam, completes a hands-on field activity, agrees to a code of ethics, and recertifies every two years with 24 hours of continuing education.
Does South Carolina require radon contractors to be certified?
SC DES recommends hiring a mitigation contractor certified by AARST's NRPP or the National Radon Safety Board (NRSB). Check with the SC DES Radon Program (1-800-768-0362) for current state requirements.
More radon guides
- Is Radon a Problem in Greenville County, SC?
- How to Test Your Greenville Home for Radon
- What Radon Mitigation Typically Costs in Upstate SC
- Radon Tests When Buying or Selling a Home in Greenville
- Radon Health Risks: What Upstate Homeowners Should Know
- What Radon Levels Mean: The EPA 4 pCi/L Action Level Explained
- Radon in Crawlspace Homes: Testing and Fixes That Work