Homeowners in Dayton, Ohio often assume a mold company needs a state mold license, the way an electrician needs one. It doesn't, because Ohio has no such license. That surprises people, and it changes what you should check before you hire anyone.
This guide walks through the Ohio and City of Dayton rules that do apply to mold problems, and what you can actually verify. It is general information, not legal advice.
The rule of thumb. Ohio issues no mold-specific license, Public Health - Dayton & Montgomery County does not regulate mold, and Ohio has no state license for residential general contractors. Check insurance, registrations, complaint history and the contract instead.
Does Ohio have a mold law?
Not in the sense most people mean. No Ohio statute sets a mold limit for homes or licenses mold inspectors or remediators. Public Health - Dayton & Montgomery County says it does not provide regulatory oversight for mold in a home, rental property or business, that there are no regulations about acceptable indoor mold levels, and that it cannot make a building owner clean up mold.
That does not make mold work a free-for-all. Ohio's consumer protection laws, landlord-tenant law, seller disclosure rules, asbestos and lead licensing, and local building codes all touch a mold job.
Do mold companies need a license in Ohio?
There is no Ohio mold license to ask for. The Ohio Construction Industry Licensing Board licenses commercial, electrical, HVAC, hydronics, plumbing and refrigeration contractors, and Montgomery County notes that state licensing is not required for general contractors or for contractors doing only 1, 2 or 3 family residential work.
The City of Dayton registers electrical, plumbing, warm-air heating and pipe-laying contractors. There is no City registration category for mold, restoration or general remodeling. In Dayton rentals, unoccupied homes that will be rented, and doubles or duplexes, plumbing, electrical and HVAC work must be done by a City-registered contractor, even if the owner lives in one unit.
So when a company says it is "licensed" for mold, ask what license, issued by whom. A private training certificate is fine to have, but it is not an Ohio license.
What you can actually check
| What to check | When it matters |
|---|---|
| Certificate of insurance (general liability) | Every job |
| Ohio Secretary of State business registration | Every job |
| Complaint history with the Ohio Attorney General and BBB | Every job |
| City of Dayton registration (electrical, plumbing, warm-air heating, pipe-laying) | When the job includes that trade work; required for it in Dayton rentals |
| Ohio EPA asbestos license | When suspect materials test positive for asbestos |
| Ohio Department of Health lead license | Lead inspection, risk assessment or abatement |
| EPA Lead-Safe Certified Firm | Paid work that disturbs paint in a pre-1978 home |
| Private mold certifications | Optional extra, not a legal requirement |
Asbestos and lead in older Dayton, Ohio homes
The median home in the city of Dayton was built in 1951, and 85.4% of homes predate 1980 (ACS 2024). Mold tear-out in homes that age can disturb pipe insulation, floor tile and mastic, or old ceiling texture. Ask whether suspect materials will be tested before demolition.
Ohio's asbestos program now sits with Ohio EPA, not the Ohio Department of Health, and larger asbestos abatement projects require an Ohio EPA-licensed contractor. Lead inspection and abatement licenses come from the Ohio Department of Health. EPA's Lead-Safe rule covers paid renovation and painting work that disturbs paint in pre-1978 homes. Treat these as questions to ask, not as a reason every job needs testing.
Contracts and door-to-door sales
Ohio's Consumer Sales Practices Act bars unfair and deceptive acts in consumer sales. Its Home Solicitation Sales Act matters most for mold work, because estimates often happen at your kitchen table:
- For a sale made at your home, you generally have until midnight of the third business day to cancel (ORC 1345.22).
- The contract should include a notice of your right to cancel.
- An emergency waiver of that right must be your own handwritten, dated and signed statement describing the emergency. Be wary of a pre-printed waiver.
- Get a written contract and itemized estimate, avoid large deposits and checks made out to individuals, and report problems to the Ohio Attorney General.
After the 2019 Memorial Day tornadoes, the Attorney General pursued storm-repair cases in the Dayton area where homeowners paid and got little or no work. The same rules protect you after a flooded basement. See hiring a mold remediation company in Ohio.
Permits for mold-related work
Cleaning and small tear-out usually need no permit. Plumbing, electrical, HVAC, structural, roofing and storm-damage repairs generally do. Dayton does not require a permit for every mold job, whatever you may read online. Check with City of Dayton Building Inspection or your city's building department; Kettering and other suburbs run their own permit offices.
Renters and landlords
Ohio landlords must keep rentals fit and habitable and keep plumbing and HVAC working (ORC 5321.04). If they don't, Ohio law lets tenants give written notice and, if the problem isn't fixed within a reasonable time or 30 days, whichever is sooner, deposit rent with the court instead of the landlord, if they are current on rent (ORC 5321.07). Some small landlords and student housing are excluded.
This is general information, not legal advice; contact Legal Aid of Western Ohio or an Ohio attorney. Dayton tenants can also contact City of Dayton Housing Inspection about housing conditions. More in Ohio renters' mold rights and on our rental and tenant mold page.
Selling a house with past mold
The Ohio Residential Property Disclosure Form asks about water intrusion and moisture in the basement or crawl space, moisture damage from flooding, seepage, condensation, ice dams, sewer backups and leaks, and whether the home was ever inspected for mold by a qualified inspector. Keep inspection reports, remediation invoices and clearance results, and talk with your agent or attorney about the form.
Insurance is a contract question, not a mold law
No Ohio law requires a homeowners policy to cover mold. Mold is usually covered only after a covered, sudden water loss. Seepage, sump failure and sewer backup usually need a separate endorsement, and flood needs a separate flood policy, typically with a 30-day wait. Read your own policy and ask your agent.
Frequently asked questions
Does Ohio have a mold law?
Ohio has no statute that sets mold limits or licenses mold work. Public Health - Dayton & Montgomery County says there are no regulations regarding the existence of mold. Other Ohio laws still apply: landlord habitability duties (ORC 5321.04), consumer protection and home solicitation rules, seller disclosure, asbestos and lead licensing, and building permits for related repairs.
Do mold remediation companies need a license in Ohio?
Ohio issues no mold-specific license, and there is no state license for residential general contractors. The City of Dayton registers only electrical, plumbing, warm-air heating and pipe-laying contractors. So check insurance, City registration for any trade work, Ohio EPA asbestos licensing if asbestos is involved, and complaint history instead of asking for a mold license.
Do I need a permit to remove mold in Dayton, Ohio?
Cleaning and small tear-out usually need no permit. Plumbing, electrical, HVAC, structural, roofing and storm-damage repairs generally do. Dayton does not require a permit for all mold removal. Ask your contractor to check with City of Dayton Building Inspection, or with your own city's building department if you live in a suburb.
Can a renter in Ohio stop paying rent because of mold?
Ohio law does not let tenants simply stop paying. Under ORC 5321.07, a tenant who is current on rent and gave written notice may deposit rent with the court if the problem isn't fixed within a reasonable time or 30 days, whichever is sooner. There are exclusions. This is general information, not legal advice; contact Legal Aid of Western Ohio or an Ohio attorney.
Want quotes you can check against this list? Describe your mold problem once and independent Miami Valley companies can reply, or call (937) 466-8339. Then compare their scopes with the mold remediation cost guide and our mold removal page.