What are a landlord's responsibilities for mold?

There is no federal mold limit

The EPA has not set federal limits for mold, so there is no number a sample can be compared to. It says that when mold is visible, sampling is usually unnecessary, and that the key to mold control is moisture control: clean the mold and fix the water problem, or it comes back (EPA, Brief Guide to Mold).

That shifts where the legal duty comes from. In most states a mold problem is handled under the general warranty of habitability, which we cover in how quickly landlords must make repairs. A few states name mold directly.

Virginia and Washington name mold directly

Virginia Code 55.1-1220(A)(5) requires the landlord to maintain the premises to prevent moisture from building up and mold from growing, to respond promptly to tenant notices, and, where there is visible evidence of mold, to promptly remediate it and reinspect to confirm no visible mold remains. The landlord must also give the tenant a summary of information related to the remediation (Va. Code 55.1-1220). The statute says promptly; it does not set a number of days.

Virginia also folds mold into move-in. The written move-in inspection report must say whether there is visible evidence of mold in readily accessible interior areas. A statement of no visible mold stands unless the tenant objects in writing within five days. If mold is disclosed, the tenant may end the tenancy before moving in, or stay, and the landlord must promptly remediate (Va. Code 55.1-1215).

Washington requires landlords to give tenants information about the health hazards of indoor mold that is provided or approved by the state department of health, at the time the lease or rental agreement is signed (RCW 59.18.060).

When the tenant is the cause

Mold from a roof leak, a failed pipe or a broken exhaust fan is the owner's job. Mold from a tenant who never runs the bathroom fan, dries laundry indoors or ignores a leak they did not report is harder. Most habitability laws exclude conditions the tenant caused, but you still need to find and fix any building cause first, because a tenant habit rarely explains everything.

• Check for a water source before blaming anyone: plumbing, roof, windows, condensation on cold exterior walls.
• Check that bathroom and kitchen exhaust fans work and actually vent outside.
• The EPA suggests keeping indoor relative humidity below 60 percent, ideally between 30 and 50 percent, and notes an inexpensive meter can measure it (EPA). A reading during your visit is useful evidence.
• If the cause is tenant behavior, put it in writing with specific, polite steps, and recheck in a few weeks.

Cleaning it up: do it yourself or hire out

The EPA's cleanup guidance sets a practical size line. A moldy area of about 10 square feet or less, roughly a 3 foot by 3 foot patch, can usually be handled in-house. Larger growth or heavy water damage calls for the EPA's guide for larger buildings and usually a contractor. Hard surfaces get scrubbed with detergent and water and dried; porous items like ceiling tiles and carpet may need to be thrown away; and paint applied over moldy surfaces is likely to peel (EPA, Mold Cleanup in Your Home).

The EPA also says to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth (EPA). That window is the most useful number in this whole topic: if every leak report is dried out within two days, most mold problems never start.

Example a made-up 30 unit building gets a leak report from unit 4C. Option one: a plumber fixes the supply line the same day ($240) and the porter runs fans for two days, so total cost is $240. Option two: the leak sits for a week, mold appears on 40 square feet of drywall, and the owner pays the plumber ($240) plus a mold contractor ($1,900) plus drywall and paint ($650), for $2,790. Speed is the cheap part.

A mold response checklist

1. Treat every leak and every mold report as urgent. Start drying within a day.
2. Find and fix the moisture source before cleaning.
3. Size the area. About 10 square feet or less: clean in-house following EPA guidance. Larger: hire a contractor.
4. Do not run an HVAC system you suspect is contaminated; the EPA warns it can spread mold.
5. Write down what you found, what you did and the photos before and after.
6. Reinspect after a few weeks. Virginia requires reinspection; it is good practice everywhere.

Where DoorKeeping fits

DoorKeeping records what a leak or mold job costs in that property's own books, so repairs stay separate from improvements when your tax preparer looks at them, and every contractor payment waits for your approval. Log each leak report as a work order on its unit, with photos kept in the property's documents. DoorKeeping gives no legal advice; check your state's rules and talk to your attorney about a specific dispute.

Sources

1. EPA, A Brief Guide to Mold, Moisture and Your Home, read Oct 29, 2026
2. EPA, Mold Cleanup in Your Home, read Oct 29, 2026
3. Code of Virginia 55.1-1220, Landlord to maintain fit premises, read Oct 29, 2026
4. Code of Virginia 55.1-1215, Move-in inspection, mold disclosure, read Oct 29, 2026
5. Revised Code of Washington 59.18.060, Landlord duties, read Oct 29, 2026

Questions

Does a landlord have to test for mold?

Usually not. The EPA says sampling is generally unnecessary when mold is visible and there are no federal mold limits to compare results to. Fixing the moisture and cleaning the mold is what matters.

How fast must a landlord fix mold?

Most laws say promptly or within a reasonable time. Virginia requires prompt remediation of visible mold and a reinspection afterward. The EPA advises drying water damage within 24 to 48 hours.

Can I clean mold myself as a landlord?

For an area of about 10 square feet or less, the EPA says you can usually do it yourself. Larger areas or heavy water damage call for a contractor.