Montana's Mold Disclosure Act: What Sellers, Buyers and Landlords Should Know
Montana is one of a handful of states with a statute specifically about disclosing mold in real estate transactions and rentals. It is short, it is often overlooked, and it comes up constantly in a market like Bozeman's, where the median home value is near $688,000 and roughly a third of the housing stock is rental. This post explains, in plain terms, what the law says and what it means for you. It is general information, not legal advice. For questions about your specific transaction or lease, talk to a Montana attorney.
What is the Montana Mold Disclosure Act?
Montana law (MCA 70-16-703), commonly called the Mold Disclosure Act, requires a seller or landlord who knows that a building has had mold to disclose that knowledge to the buyer or tenant. It also requires disclosure of any mold testing that has been done, the results of that testing, and any mitigation or remediation that followed. The statute is in Title 70, Chapter 16, Part 7 of the Montana Code Annotated, alongside other property-disclosure rules.
The key word in the law is "knows." The Act is not a requirement to test every property for mold before selling or renting it, and it does not require a seller or landlord to go looking for mold they have no reason to suspect. It is a requirement to be honest about what you already know.
What exactly has to be disclosed?
Under Montana law (MCA 70-16-703), a seller or landlord with knowledge of mold should disclose:
- That the building has, or has had, mold.
- Any mold testing or inspection that has been performed, and who did it.
- The results of that testing.
- Any mitigation or remediation that was done in response, including what was done and by whom.
In practice, this means that if you had a basement remediated after a burst pipe in 2023, you should expect to disclose that, along with the inspection report and the remediation invoice, when you sell or rent the home. That is one reason we provide a written scope before every job and a written summary afterward: the paperwork becomes part of the property's history.
What is the optional disclosure form, and why does it matter?
The Act describes a standard mold disclosure statement that a seller or landlord may provide. When the seller or landlord provides this disclosure, the statute grants immunity from liability for mold-related claims arising from conditions the seller or landlord did not know about. In plain English: if you are honest about what you know and you give the buyer or tenant the standard notice, you are protected from being sued later over mold you genuinely had no knowledge of. Montana real estate forms used by licensed agents typically include this disclosure as a routine attachment, which is why most Gallatin Valley buyers see it in their closing packet without noticing.
The exact wording of the form, how it must be delivered, and how the immunity applies in a given dispute are legal questions. Please confirm the current statute and consult an attorney or your real estate professional.
What does this mean if I am selling a home in Bozeman?
Three practical steps. First, be honest on the property disclosure statement about any mold you have seen, tested for or remediated, even if it was years ago and fully resolved. A documented, professionally remediated problem is far less alarming to a buyer than an undisclosed one discovered during inspection. Second, keep your paperwork: inspection reports, lab results, the remediation scope and invoice, and any clearance test. Third, if you suspect mold but have not confirmed it, consider a professional inspection before listing. Knowing what you are dealing with lets you fix it on your own timeline rather than during a tense inspection period.
What does this mean if I am buying?
Read the mold disclosure, and ask questions if it is blank or vague. Montana requires no license for mold remediation contractors, so "it was remediated" can mean anything from a full containment job to a handyman with a spray bottle. Ask for the scope of work and any post-remediation testing. In this climate, pay particular attention to attics on north-facing roofs (ice dams), crawl spaces and basements (snowmelt), and bathrooms without exhaust fans. A general home inspector will flag visible mold; if there are water stains, a musty smell, or a history of leaks, a dedicated mold inspection with moisture readings and sampling, typically $300 to $700, is a reasonable add-on. Keep in mind that the seller's immunity under the Act covers mold they did not know about, which means the burden of discovering hidden problems often falls on the buyer's inspection period.
Buying a home in Bozeman, Belgrade or Livingston? If the disclosure mentions prior mold or water damage, ask for the written scope and any clearance test results. If the seller cannot produce them, an independent inspection before closing is inexpensive insurance compared to a $4,000 basement remediation after you move in.
What does this mean if I am a landlord?
The Act applies to landlords as well as sellers. If you know a unit has had mold, you should disclose it to prospective tenants, along with any testing and remediation history. Beyond disclosure, Montana's residential landlord-tenant law separately requires landlords to keep rental units fit and habitable, and mold caused by leaks, failed ventilation or building defects generally falls on the landlord to address. Mold caused by a tenant's own conduct, such as never running the bath fan or drying laundry indoors with windows closed, is a more complicated question. Either way, responding quickly, documenting the cause, and fixing the moisture source is the approach that protects everyone. Our rental property mold service is built for Bozeman landlords and property managers, including those with MSU student units, and we can provide the written documentation the Act contemplates.
What does this mean if I am a tenant?
You should receive a mold disclosure when you sign a lease. If you find mold during your tenancy, report it to the landlord in writing, with photos and the date. Keep running the bath fan and keep humidity down so the cause is clearly not your conduct. If the landlord does not respond, Montana's landlord-tenant statutes describe remedies, and a tenant advocacy group or attorney can explain them. We do not give legal advice, but we are happy to inspect and document the problem for either party.
Does the Act require mold testing?
No. Nothing in MCA 70-16-703 requires anyone to test for mold. It requires disclosure of testing that has already been done. That said, testing is sometimes the only way to resolve a dispute between a buyer and seller or a landlord and tenant, which is why we offer optional third-party clearance testing after remediation. Learn more on our cost page.
Whether you are listing a home, buying one, or managing a rental, knowing the condition of the property is better than guessing. Request a free quote or call Call (727) 300-6656 for an inspection or remediation estimate anywhere in the Gallatin Valley. For legal questions about the Mold Disclosure Act, please consult a Montana attorney.