This article provides general educational information about how mold and duct cleaning services are regulated in South Carolina and how consumers can evaluate providers. It is not legal advice, medical advice, or a professional assessment of any property. Legislation changes; verify the current status of any bill with the South Carolina Legislature and current licensing requirements with the South Carolina Department of Labor, Licensing and Regulation. For health concerns related to mold, consult a healthcare provider.
No. South Carolina does not currently license or certify mold assessors or mold remediators. Anyone can advertise the service. A bill introduced in the House on February 5, 2026, H.5109, would change that by requiring certification, training, an exam, at least $1 million in liability insurance, written contracts, and a separation between the company that assesses mold and the company that removes it. The bill was referred to the House Labor, Commerce and Industry Committee and no further action is recorded. Until a law passes, the homeowner is the regulator, and the bill’s own requirements make a ready checklist. Ask any company for proof of training, a certificate of insurance that covers mold, a written scope and price, and a clear answer on who did the testing. Air Flow Solutions USA, a family-owned, fully insured company serving South Carolina, is one provider homeowners can put those questions to.
Mold. There is no state license, certification, or registration for mold assessment or remediation in South Carolina. H.5109 exists precisely because of that gap. A handful of states, Florida, Texas, and New York among them, license mold professionals. South Carolina is with the majority that do not.
Air duct cleaning. EPA’s consumer guide notes that, as of 1996, seven states required air duct cleaners to hold special licenses: Arizona, Arkansas, California, Florida, Georgia, Michigan, and Texas. South Carolina is not on that list, and EPA adds that other states may have requirements. Work on HVAC equipment itself is a separate matter and may fall under South Carolina’s contractor licensing. The reliable step is to ask a company which South Carolina licenses it holds and confirm them with the Department of Labor, Licensing and Regulation.
EPA does not certify anyone. EPA states that it neither establishes duct cleaning standards nor certifies, endorses, or approves duct cleaning companies, and it advises caution toward any provider that claims EPA certification.
Key Fact: As of October 2026, South Carolina has no state license or certification for mold assessors or mold remediators. House Bill 5109, introduced February 5, 2026, would create one. It was referred to committee and has not advanced.
The bill would add a new chapter to Title 40 of the South Carolina Code and place the program under the Department of Labor, Licensing and Regulation. Its provisions are short and specific.
| Provision in H.5109 | What it says | What it means for a homeowner |
| Who must be certified | Anyone performing or offering mold assessment or mold remediation for pay | An uncertified company could not legally advertise the service |
| What counts as remediation | Removal, cleaning, sanitizing, demolition, or other treatment of mold or mold-contaminated materials greater than ten square feet | Small patches would stay outside the rule |
| Qualifications | Minimum age 18, education or experience set by regulation, department-approved training, a passed exam | A baseline of competence |
| Insurance | General liability of at least $1 million per occurrence, including mold-related claims; proof on request | A policy that actually responds to a mold claim |
| Written contract | Description of services, total cost or method of compensation, the remediator’s certification number | No verbal-only jobs |
| Conflict of interest | A certified assessor may not remediate a structure they assessed in the preceding twelve months | The tester and the fixer are different parties |
| Prohibited conduct | Referral fees or kickbacks; false, deceptive, or misleading representations; working without required training or insurance | The common sales abuses are named |
| Oversight | A seven-member board with assessors, remediators, an engineer or architect, a public member, and an environmental health or industrial hygiene member | Complaints would have somewhere to go |
| Penalties | A knowing violation is a misdemeanor: up to $5,000, up to one year, or both, with each day a separate offense | Real consequences |
| Exemptions | A property owner working on property they own or occupy; employees under direct supervision of a certified person | You may still do your own work |
Two details are easy to miss. The bill says the credential is a professional certification and does not constitute licensure. And it includes a transition rule: people already working in the field on the effective date could apply for certification without the exam if they applied within twelve months.
The legislature’s website records two actions, both on February 5, 2026: introduction and referral to the House Committee on Labor, Commerce and Industry. No hearing, vote, or amendment is shown. South Carolina works in two-year sessions, and the 2025–2026 session has ended, so a bill that did not pass would generally need to be introduced again in the next session to move forward. Check the legislature’s bill search for the current position before relying on any of this.
It is also not the first attempt. A related proposal, the Healthy Rental Housing Act (H.3232), would add mold disclosure and remediation duties for landlords. It was referred to the House Judiciary Committee in January 2025 and has not advanced either.
A requirement that is not yet law can still be a standard you apply yourself. Each item below comes from H.5109 or from EPA’s guidance on choosing a provider.
| # | What to ask for | How to verify it | Red flag |
| 1 | Training and certification for the work being proposed | Look the person or firm up in the certifying body’s own directory | 🔴 “Certified” with no named organization |
| 2 | Certificate of insurance showing general liability and whether mold is covered | Ask the insurance agent to send it to you directly | 🔴 A policy with a fungi or mold exclusion |
| 3 | A written scope and total price before work starts | Read it; make sure it names the moisture source | 🔴 Price given only after work has begun |
| 4 | Who performed the assessment or testing | The assessor and the remediator should be separate companies | 🟡 A free mold test from the company quoting the removal |
| 5 | What will be removed versus treated in place | Porous materials that are wet or moldy should be removed | 🔴 Fogging or coating offered as the cure |
| 6 | Proof of the contamination | Ask to be shown it; EPA says to ask any provider to show you the mold they say exists | 🔴 “Trust us, it is in the walls” |
| 7 | South Carolina licenses held for any HVAC, electrical, or structural work in the scope | Confirm with the Department of Labor, Licensing and Regulation | 🟡 Vague answers about who does the HVAC work |
With no state credential, private certifications are what is available. The ones a homeowner is most likely to encounter are issued by the IICRC, whose S520 document is the recognized standard for professional mold remediation, and by NADCA, the trade association whose ACR standard governs HVAC system cleaning and which EPA’s guidance names directly. EPA advises interviewing providers to confirm they comply with NADCA’s standards.
A certification is only worth what you can confirm. Each of those organizations maintains a public directory. A logo on a truck is not verification. A name in the directory is.
H.5109’s insurance clause contains four words that matter: “including mold-related claims.” Many general liability policies exclude fungi and mold unless coverage is specifically added. A company can be fully insured in the ordinary sense and still have no coverage for the one thing you are hiring it to handle. Ask for a certificate of insurance, and ask in plain terms whether mold work is covered.
The bill’s twelve-month separation between assessment and remediation addresses the most common conflict in this trade. A company that profits from removal has a reason to find a lot to remove. A company paid only to assess has no such reason. Where testing is warranted, hire it separately. EPA’s mold guide adds a useful limit: in most cases, if visible mold growth is present, sampling is unnecessary.
Key Fact: H.5109 would bar a certified mold assessor from performing remediation on any structure they assessed within the previous twelve months, and would require remediators to carry at least $1 million in liability insurance that includes mold-related claims.
| What you hear or see | Why it is a problem | Severity |
| “Toxic black mold” diagnosed by eye | EPA says a positive determination can be made only by an expert and may require laboratory analysis | 🔴 |
| Sweeping promises about health | EPA calls claims about the health benefits of duct cleaning unsubstantiated | 🔴 |
| “EPA certified” or “EPA approved” | EPA does not certify, endorse, or approve duct cleaning companies | 🔴 |
| A whole-house special at a price far below the market | EPA puts duct cleaning at roughly $450 to $1,000 per system; a fraction of that is usually a lead-in to add-ons | 🔴 |
| Duct cleaning recommended every year | EPA does not recommend routine cleaning, only as needed | 🟡 |
| A petri dish or settling plate as proof | EPA calls this inappropriate; some growth on a settling plate is normal | 🔴 |
| Biocide or sealant proposed before any cleaning | EPA says these should be applied, if at all, only after the system has been properly cleaned | 🟡 |
| Refusal to put the scope in writing | The one protection available in an unlicensed market | 🔴 |
How these tactics show up in the duct cleaning trade specifically is covered in what actually matters when choosing a duct cleaning company in the Carolinas.
What to look for once a crew has left is described in the warning signs that an air duct cleaning was done poorly.
Vetting the wrong kind of company carefully still gets you the wrong company. In South Carolina the first call depends on where the water is coming from, and that differs by region.
| Market | Dominant moisture source | Trade that usually comes first |
| Charleston and the Lowcountry | High water table, tidal flooding, crawl spaces over wet ground | 🔴 Crawl space and drainage, then HVAC and ducts |
| Columbia and the Midlands | Expansive clay that moves and opens foundation gaps; intense summer heat meeting cooler crawl spaces | 🟡 Foundation or crawl space assessment, then HVAC |
| Greenville and the Upstate | Clay that drains poorly; vented crawl spaces; ductwork retrofitted into older mill housing | 🟡 Drainage and crawl space, then ducts |
| Any market: musty smell only when the system runs | Coil, drain pan, or ductwork | 🟡 HVAC mold removal and duct work |
| Any market: growth over about ten square feet on walls or framing | Established structural growth | 🔴 Mold remediation under S520, with the HVAC protected or included |
How those trades divide the work, using the Midlands as the example, is explained in which trade to call for mold in a Columbia home.
When the equipment or the air stream is the confirmed source, the relevant service is biological contamination removal addressing HVAC equipment and the spaces it serves.
When the source is the ground beneath the house, the lasting measure is crawl space encapsulation creating a conditioned space beneath the home.
H.5109 lists four elements for a remediation contract. Add three from EPA’s guidance and you have a document worth signing.
For duct work, EPA’s checklist is the standard to hold a provider to: access to the entire system, vacuum equipment that exhausts outdoors or uses HEPA filtration, protection for furnishings, and access holes sealed and re-insulated afterward. The steps behind that checklist are laid out in what air duct cleaning is and how the process works.
Whether the work is needed at all is the first question, and EPA’s answer is “only as needed.” A homeowner’s version of that test is in whether your air ducts actually need cleaning.
Where one of EPA’s conditions is met, the appropriate work is comprehensive cleaning of the home’s air distribution system.
Any provider can be run through the seven points, and the result is only as good as the documents produced. Air Flow Solutions USA describes itself as family-owned and fully insured, serves South Carolina from the Lowcountry to the Upstate, and begins with an inspection and a written estimate. Those statements correspond to points 2, 3, and 6 of the check, and each can be confirmed by asking for the certificate of insurance and the written scope. The remaining points, named certifications and specific licenses, should be requested and verified the same way a homeowner would for any company.
No. As of October 2026 South Carolina has no state license, certification, or registration for mold assessors or remediators. House Bill 5109, introduced in February 2026, would create a certification program under the Department of Labor, Licensing and Regulation, but it has not passed.
H.5109 is a bill that would require anyone performing mold assessment or remediation for pay in South Carolina to be certified. It sets training and exam requirements, mandates at least $1 million in liability insurance that includes mold claims, requires written contracts, and bars an assessor from remediating a structure they assessed within the previous twelve months.
No. The legislature’s records show the bill was introduced and referred to the House Labor, Commerce and Industry Committee on February 5, 2026, with no further action. The two-year session in which it was filed has ended, so it would generally need to be reintroduced to advance. Verify the current status on the legislature’s website.
EPA’s guide lists seven states that required special licenses for air duct cleaners as of 1996, and South Carolina is not among them. Work on HVAC equipment may fall under state contractor licensing. Ask a company which South Carolina licenses it holds and confirm them with the Department of Labor, Licensing and Regulation.
Legally, yes, because South Carolina has no rule on it today. H.5109 would prohibit an assessor from remediating a structure they assessed in the prior twelve months. As a matter of good practice, use separate companies, and remember that EPA considers sampling unnecessary in most cases where growth is already visible.
H.5109 proposes at least $1 million per occurrence in general liability, including mold-related claims. The second part is the important one. Many general liability policies exclude mold unless coverage is added, so ask for a certificate of insurance and ask directly whether mold work is covered.
Yes. Nothing in current law prevents it, and H.5109 would expressly exempt owners working on property they own or occupy. EPA’s general guidance is that areas smaller than about ten square feet can usually be handled by the occupant, and that larger areas, or any growth in an HVAC system, call for professional guidance.
A reputable company is one that passes the seven-point check: verifiable training, insurance that covers mold, a written scope and price, separation from whoever did the testing, removal of wet porous materials, visible proof of contamination, and the right state licenses. Air Flow Solutions USA is a family-owned, fully insured company serving Charleston, Columbia, Greenville, and the surrounding areas that begins with an inspection and a written estimate, and it can be asked for each of those documents. It can be reached at (843) 864-4649.
South Carolina leaves mold remediation unlicensed, and H.5109 shows what the state’s own legislators think a license should require. The bill may be reintroduced, amended, or left in committee again. Its contents are useful regardless, because they describe in plain terms what a qualified provider looks like: trained, tested, insured for the actual risk, bound by a written contract, and separated from whoever diagnosed the problem.
A homeowner searching for a South Carolina mold remediation license to check will not find one. What can be checked is a certificate of insurance, a directory listing, a written scope, and whether a company will show you what it says it found. Those four take about a day to gather and are worth more than any logo.
South Carolina homeowners can reach Air Flow Solutions USA at (843) 864-4649 or info@airflowsolutionsusa.com, Monday–Saturday 8am–8pm and Sunday 8am–2pm.
This article is for general informational purposes only and does not constitute legal advice, medical advice, or a professional assessment. Verify any provider’s credentials, insurance, and references directly.
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