Statewide Ohio Realtor Resources
Ohio Real Estate Radon Resources
Statewide radon testing and mitigation support for Ohio realtors, brokers, and MLS members. Closing-timeline turnarounds, Ohio Real Estate Seller Disclosure Law (Ohio Rev. Code § 5302.30 (Residential Property Disclosure Form)) compliance, Ohio Admin. Code Chapter 3701-69 ODH-certified partner contractors, and Bright MLS + West Penn MLS coverage across 14 Ohio metros.
Ohio Radon Disclosure Law for Real Estate Transactions
The Ohio Residential Property Disclosure Act (Ohio Rev. Code § 5302.30 (Residential Property Disclosure Form)), Section 6, governs Residential Real Estate Disclosure. Sellers are required to disclose known radon test results and the presence of any installed radon mitigation system to buyers as part of the standard Ohio Residential Property Disclosure Form. While Ohio does not legally mandate pre-sale testing, the Ohio Association of REALTORS (OAR), Columbus REALTORS, the Cleveland Area Board of REALTORS, the Cincinnati Area Board of REALTORS, and the Dayton Area Board of REALTORS all recommend radon testing as standard real estate transaction practice — particularly in uranium-bearing Devonian Ohio Shale counties where elevated readings are essentially expected.
Key disclosure requirements under Ohio law:
- If radon testing has been performed at the property, the seller must disclose the date and result.
- If a radon mitigation system is installed, the seller must disclose the installation date, the certified installer, and any recent verification testing.
- Sellers cannot legally withhold radon information they possess about the property under 68 Pa. C.S. § 7304.
- The penalty for failing to disclose known radon issues includes potential rescission of the sale, actual damages, and attorney's fees under 68 Pa. C.S. § 7311.
- All radon mitigation work performed in OH must be executed by a contractor certified under Ohio Admin. Code Chapter 3701-69 by the ODH Bureau of Environmental Health and Radiation Protection — installation by an uncertified party is a violation of the Ohio Radon Licensing Act and may void the disclosure.
The Ohio Association of REALTORS recommends including a radon contingency clause in every OAR Standard Agreement for the Sale of Real Estate, allowing buyers to: (1) conduct radon testing during the inspection period, (2) require seller mitigation if results exceed 4 pCi/L, (3) negotiate cost responsibility, and (4) terminate the agreement if mitigation cannot be completed within the closing timeline.
ALA Risk Framework · Use in disclosure conversations
Source: American Lung Association Healthcare Provider Decision Support Tool (2024) + EPA A Citizen's Guide to Radon (EPA 402/K-12/002). Smoker-radon risk is multiplicative (~9× non-smoker risk at each exposure level) due to synergistic effect between tobacco-related lung damage and alpha-particle radiation from radon decay products.
The American Lung Association Risk Framework — A Realtor's Disclosure Tool
Ohio's Real Estate Seller Disclosure Law (Ohio Rev. Code § 5302.30 (Residential Property Disclosure Form)) requires disclosure of known radon results — but the legal floor is only half the story. The American Lung Association (ALA) maintains the most-cited residential radon risk framework in the United States, and Ohio realtors who can speak to ALA's risk model in a disclosure conversation move buyers from "should I worry?" to "let's address it" faster than any other tool.
ALA Lifetime Lung Cancer Risk by Radon Exposure
The ALA Healthcare Provider Decision Support Tool (2024) models lifetime lung cancer risk from chronic radon exposure for both non-smokers and current smokers, by radon level. The data below — sourced from ALA + EPA — is the framework realtors can cite when a buyer asks "is 4 pCi/L really that bad?"
| Indoor radon (pCi/L) | Never-smoker lifetime risk | Smoker lifetime risk | ALA / EPA recommendation |
|---|---|---|---|
| 1.3 (US avg) | ~2 in 1,000 | ~20 in 1,000 | No action required |
| 2.0 | ~4 in 1,000 | ~32 in 1,000 | Consider mitigation (esp. smokers / children) |
| 4.0 (EPA action level) | ~7 in 1,000 | ~62 in 1,000 | Mitigate — install active radon system |
| 8.6 (Ohio state avg) | ~15 in 1,000 | ~125 in 1,000 | Urgent mitigation |
| 10.0 | ~18 in 1,000 | ~150 in 1,000 | Urgent mitigation; consider interim ventilation |
| 20.0+ | ~36+ in 1,000 | ~260+ in 1,000 | Emergency mitigation; limit time in affected levels |
How to frame a radon disclosure conversation with a buyer or seller
The ALA framework gives realtors a defensible, third-party-authority script for radon-disclosure conversations. Three usage patterns:
- For sellers with elevated test results: "Ohio Rev. Code § 5302.30 (Residential Property Disclosure Form) requires you to disclose this reading. The ALA risk model says a never-smoker at this level has [X in 1,000] lifetime lung cancer risk attributable to radon, and the EPA recommends mitigation. Pre-listing mitigation typically costs $800-$2,500 (Cleveland/Cincinnati Metros $1,000-$2,000) and converts the disclosure from a sale-killer to a sale-accelerator — verified-mitigated homes close faster and at full price."
- For buyers facing an elevated inspection result: "This is a routine Ohio transaction issue. The ALA framework places a 4.0 pCi/L home at 7-in-1,000 lifetime risk for non-smokers, and the EPA recommends mitigation as soon as practical. We have NRPP + ODH-certified partner contractors (Ohio Admin. Code Chapter 3701-69) who can install + verify within the 7-14 day window most contingencies allow. Most Ohio sellers cover this cost."
- For sellers considering whether to pre-test before listing: "Ohio ranks 4th-highest nationally for indoor radon (state average 4.7 pCi/L). The ALA framework predicts ~1 in 3 Ohio homes will test elevated — and in uranium-bearing Devonian Ohio Shale counties (Cuyahoga, Summit, Mahoning, Stark, Richland) that ratio is significantly higher due to the underlying black shale geology. Pre-testing surfaces the issue under your control rather than under buyer-side closing pressure — a pre-mitigated home with verified post-test documentation typically closes faster and at higher price than a home with an elevated test result mid-transaction."
ALA radon resources: lung.org/radon · ALA Ohio: lung.org/pa · EPA A Citizen's Guide to Radon: epa.gov/radon
Ohio Real Estate Radon Transaction Timeline
Standard Ohio transaction timeline from initial test through verified post-mitigation result, designed to fit within most OAR Standard Agreement inspection contingency windows.
| Day | Step | Who | Duration |
|---|---|---|---|
| Day 0 | CRM deployed at property during home inspection | ODH-certified measurement provider | Instantaneous |
| Day 2-4 | Test retrieval + result reporting | ODH-certified measurement provider | 48-96 hr test period |
| Day 4 | Result review — elevated (>4 pCi/L) triggers mitigation | Realtor + buyer + seller | 1 day |
| Day 5-7 | On-site assessment by NRPP + ODH-certified mitigator | Partner contractor | 1-2 hr visit |
| Day 7-9 | Written quote provided + cost negotiation | Realtor + buyer + seller | 2-3 days |
| Day 9-12 | Mitigation system installed | Partner contractor | 4-8 hours on-site |
| Day 13-16 | Post-mitigation verification test (independent measurement provider) | Partner contractor | 48-96 hr test |
| Day 16 | Verification result + final documentation | Partner contractor | 1 day |
| Day 16+ | Closing proceeds with verified mitigation | Closing agent | Per contract |
Services We Provide to Ohio Realtors
- Pre-listing radon testing — Recommend to sellers before MLS listing to surface and mitigate radon issues upfront. Especially valuable in uranium-bearing Devonian Ohio Shale counties (Berks, Lehigh, Northampton, Bucks, Montgomery, Chester) where elevated readings are essentially expected.
- Pre-purchase radon testing — Buyer-side testing during inspection contingency period. CRM-based for transaction-grade documentation.
- Closing-timeline mitigation — Expedited 7-14 day install + verification turnaround. Designed for active OAR Standard Agreement transactions.
- Existing system verification — Confirms a previously-installed radon mitigation system is still maintaining indoor radon below 4 pCi/L. Standard practice for transfers of homes with existing systems, particularly those installed pre-2018 (fan-replacement window).
- FHA / USDA / VA loan compliance documentation — Test reports and verification documentation in lender-acceptable formats.
- New construction RRNC consulting — Ohio builder coordination on Radon-Resistant New Construction features per ASTM E1465 and Ohio Residential Code recommendations.
- Multi-property portfolio testing — Ohio property managers, REITs, and rental portfolio owners.
Ohio MLS & Association Coverage Areas
Ohio Radon Experts partner network serves the major Ohio MLS regions and member associations:
- Greater Philadelphia Association of REALTORS (GPAR) — Bright MLS — Philadelphia, Bucks, Chester, Delaware, Montgomery counties
- Realtors Association of Metropolitan Pittsburgh (RAMP) — West Penn MLS — Pittsburgh, Allegheny, Washington, Westmoreland, Beaver counties
- Greater Lehigh Valley REALTORS — Bright MLS — Allentown, Bethlehem, Easton, Lehigh + Northampton counties
- Berks-Schuylkill Realtors — Reading, Pottstown, Berks + Schuylkill counties (uranium-bearing Devonian Ohio Shale epicenter)
- Greater Scranton Board of REALTORS — Scranton, Lackawanna County
- Greater Wilkes-Barre Association of REALTORS — Wilkes-Barre, Luzerne + Wyoming counties
- Greater Columbus Association of REALTORS — Columbus, Dauphin + Cumberland + Perry counties
- Lancaster County Association of REALTORS — Lancaster, Lancaster County
- Realtors Association of York and Adams Counties (RAYAC) — York, Adams counties
- Lebanon County Association of REALTORS — Lebanon, Lebanon County
- Centre County Association of REALTORS — State College, Centre County
- Blair County Association of REALTORS — Altoona, Blair County
- Greater Erie Board of REALTORS — Erie, Erie County
Statewide partner contractor coverage available for properties outside the 14 directly-served metros. All partners certified under Ohio Admin. Code Chapter 3701-69.
Realtor FAQ
Ohio Real Estate Radon Questions Realtors Ask
Frequently Asked Questions
Does Ohio law require radon testing before a home sale?
Ohio does not legally mandate pre-sale radon testing, BUT the Ohio Residential Property Disclosure Act (Ohio Rev. Code § 5302.30 (Residential Property Disclosure Form)) requires sellers to disclose any KNOWN radon test results and any installed radon mitigation systems to buyers. Section 6 of the Ohio Residential Property Disclosure Form addresses radon disclosure specifically. In practice, most Ohio real estate transactions now include a radon contingency clause in the Standard Agreement for the Sale of Real Estate, and the Ohio Association of REALTORS (OAR) recommends testing as standard practice given Ohio's elevated nationally-ranked indoor radon levels and the uranium-bearing Devonian Ohio Shale geology that drives elevated readings across Northeast Ohio.
What is the standard radon testing protocol for Ohio real estate transactions?
For real estate transactions, EPA recommends a short-term test (48-96 hours) using either a charcoal canister or a continuous radon monitor (CRM) under closed-house conditions. The CRM method is preferred for Ohio transactions because it provides hour-by-hour readings that can detect tampering (windows opened during the test) and supplies a defensible time-stamped result for closing documentation. Ohio Radon Experts partner contractors use AARST-NRPP-certified Femto-TECH and Sun Nuclear CRMs for all transaction testing, and every measurement provider on our network holds active ODH Bureau of Environmental Health and Radiation Protection certification under Ohio Admin. Code Chapter 3701-69.
If a radon test comes back elevated, can mitigation be completed before closing?
Yes. Standard Ohio real estate transaction radon mitigation timeline: Day 0 — test result received (elevated, >4 pCi/L); Day 1-3 — partner contractor on-site assessment; Day 3-5 — written quote provided; Day 5-7 — buyer/seller agreement on cost responsibility; Day 7-10 — mitigation system installed (typically 4-8 hours of on-site work by a ODH-certified mitigator); Day 11-14 — post-mitigation verification test conducted by an independent measurement provider; Day 14 — final report ready for closing documentation. The full cycle typically takes 7-14 days, fitting within most Ohio Standard Agreement inspection contingency windows.
Who typically pays for radon mitigation in a Ohio real estate transaction?
Ohio Association of REALTORS guidance and partner contractor data suggest roughly 60% of radon mitigations in OH transactions are seller-paid, 30% are negotiated cost-share or credit-at-closing arrangements, and 10% are buyer-paid. The OAR Standard Agreement for the Sale of Real Estate does not mandate which party pays — this is negotiated between buyer and seller after an elevated test result. Many Ohio listing agents in uranium-bearing Ohio Shale counties (Cuyahoga, Summit, Mahoning, Stark, Richland, Belmont) now recommend pre-listing radon testing so sellers can either mitigate proactively or price-adjust before listing, avoiding mid-transaction disputes in the geology zones where elevated results are essentially expected.
Are FHA loans different on radon requirements in Ohio?
HUD Handbook 4000.1 does not require radon testing for FHA-backed loans as of 2026, but HUD strongly encourages radon testing on all FHA-insured properties. Some FHA underwriters in high-radon states (Ohio ranks 4th-highest nationally per recent data, with ~1 in 3 homes elevated per ODH) request radon test results during underwriting, and many Ohio FHA lenders include radon testing as part of standard inspection requirements — particularly on properties in EPA Zone 1 counties. USDA Rural Development loans similarly encourage testing. VA loans do not require radon testing but VA appraisers may flag elevated radon as a property condition issue. New construction homes built under the Ohio Residential Code commonly include radon-resistant construction (RRNC) features per ASTM E1465 standards.
Can radon testing be done at the same time as a home inspection?
Yes, and this is the standard Ohio practice. Most Ohio home inspectors place a continuous radon monitor (CRM) during the inspection and retrieve it 48-96 hours later when they return for the final inspection report walkthrough. Some inspectors hold their own ODH measurement certification under Ohio Admin. Code Chapter 3701-69; others coordinate with ODH-certified measurement partners like the Ohio Radon Experts network. Coordinating testing with inspection compresses the transaction timeline and is the default workflow for most Columbus, Cleveland, Cincinnati, and Dayton metro transactions.
Does an existing radon mitigation system need to be tested before transfer of ownership?
Best practice — yes. Ohio Association of REALTORS recommends post-mitigation verification testing whenever a home with an existing radon system changes ownership. This confirms the system is functional and currently maintaining indoor radon below the EPA action level of 4 pCi/L. Many Ohio real estate transactions include verification testing of existing systems as a buyer-protection step — particularly important in OH because radon fan motors are rated for ~8 years of service and pre-2018 systems may be on their second or third fan. If the seller cannot produce documentation of the original mitigation install plus biannual verification testing, buyers commonly request a current verification test as a condition of closing.
Ohio MLS — how should radon mitigation be disclosed in listing notes?
Ohio MLS listings should disclose: (1) Whether radon testing has been performed and the date + result, (2) Whether a radon mitigation system is installed and the installation date + the ODH-certified mitigator who installed it, (3) Date of the most recent post-mitigation verification test and the result. MLS Now (covers Cleveland metro and most of Northeast Ohio), Columbus REALTORS MLS, and Cincinnati MLS both include radon disclosure fields. The Ohio Association of REALTORS has issued guidance encouraging full radon disclosure on all Ohio MLS listings. Sellers who have proactively tested and mitigated typically command faster offers and higher closing prices because radon uncertainty is removed from buyer negotiations.
How does Ohio Radon Experts work with real estate agents?
Ohio Radon Experts is a lead-routing service that connects realtors and their clients with NRPP-certified AND ODH-certified partner contractors statewide. Realtors can request testing or mitigation services directly through our contact form or by calling our routing line. Standard turnaround: response within 4 business hours, on-site visit within 2-7 days, post-mitigation verification testing included. We do not pay referral fees — Ohio law and Ohio Real Estate Commission rules prohibit paying real estate licensees for unlicensed work referrals. We do provide expedited closing-timeline scheduling at no premium for licensed Ohio realtors working under OAR, Columbus REALTORS, Cleveland Area Board of REALTORS, Cincinnati Area Board of REALTORS, and other Ohio member boards.
Ohio Realtor? Set Up a Direct Partnership Line.
Realtors get expedited routing, transaction-grade documentation, and direct ODH-certified partner contractor access for every Ohio listing. Call (614) 259-7858 or submit a quote request.