A landlord who finds mold in a rental property should act on two things at once: fix the water problem that caused it, and have the affected materials assessed and remediated properly. There is no federal EPA “action level” for mold, so the standard the industry works to is IICRC S520 — find and stop the moisture source, contain the area, remove or clean affected materials, and document the work. Environmental Services of America (ES America) assesses and remediates mold across Georgia, South Carolina, and Alabama. Call (404) 994-6006.
Last updated July 2026 · By D.K.H.
Mold in a rental is a moisture problem before it is a mold problem, and it is a documentation problem right behind that. Tenants report a smell or a stain; the landlord needs to respond quickly, fix the actual cause, and be able to show what was done. Here is how a professional handles it — and where landlords most often go wrong.
Is a landlord responsible for mold in a rental property?
Responsibility usually follows the cause, and the cause is almost always water. Landlord–tenant obligations vary by state and by lease, so this is not legal advice — but practically, mold growth is a symptom of a leak, a roof or plumbing failure, poor drainage, an HVAC condensation issue, or ventilation that can’t keep up. Those building-condition items generally sit with the property owner. What sits with the tenant is timely reporting and reasonable use (running the bath fan, not blocking vents, not letting a spill sit for a week). The practical takeaway for an owner: treat a mold report as a habitability and building-maintenance issue, respond in writing, and keep records of every step.
Is there a legal limit for mold in a rental?
No — the EPA has not set a federal action level or exposure standard for mold, and there is no number that says “this unit passes.” That surprises a lot of owners who expect a pass/fail lab result. What exists instead is a widely used industry standard of care: ANSI/IICRC S520, the standard for professional mold remediation. It defines conditions (normal fungal ecology versus settled spores versus actual growth), and it makes the goal clear: remove the growth and correct the moisture that fed it, rather than chase a number. That standard — plus your documentation — is what a professional job is measured against.
What should a landlord do first when a tenant reports mold?
Stop the water, then look at the materials. In order:
- Respond in writing and date it. Acknowledge the report, schedule the assessment.
- Find the moisture source. A visible patch on drywall is the end of the story, not the beginning — the leak may be a floor above or inside the wall.
- Don’t paint or bleach over it. Coating growth hides it, doesn’t kill what’s inside porous material, and destroys evidence of the original condition.
- Don’t let untrained staff tear it out. Ripping out moldy drywall without containment spreads spores through the unit and into shared HVAC.
- Get an assessment — inspection, moisture mapping, and sampling where warranted — so the scope of work is based on findings, not guesswork.
- Keep the paper. Assessment report, scope, invoices, post-remediation verification. This is the record that protects you later.
What does professional mold remediation in a rental look like?
Professional remediation follows the S520 sequence: identify and stop the moisture source, contain the work area (plastic containment, negative air pressure, HEPA filtration) so spores don’t travel into the rest of the unit, remove porous materials that can’t be cleaned (drywall, carpet, insulation), HEPA-vacuum and clean the remaining surfaces and structure, dry the assembly, and then verify visually and, where appropriate, by post-remediation testing. The unit is returned dry and clean, and the owner gets documentation of the scope and the result. See mold remediation for the service, and mold testing for the assessment step that defines the scope.
Can I just have my maintenance crew handle it?
It depends entirely on the size and the cause. A small patch of surface growth on a non-porous surface from a one-time spill is maintenance. Growth on drywall, growth that keeps coming back, growth from an unresolved leak, growth inside a wall or under flooring, or anything spanning a meaningful area is not a mop-and-bucket job — it needs containment, or you turn one contaminated room into a contaminated unit. A useful rule of thumb for an owner: if you cannot say with confidence where the water came from and that it has stopped, you are not ready to clean anything yet.
Why ES America?
Environmental Services of America (ES America) has extensive environmental remediation experience across Georgia, South Carolina, and Alabama, and works to the ANSI/IICRC S520 standard for mold remediation — assessment first, moisture source corrected, containment, documented scope, verification at the end. Because ES America also handles asbestos and lead, an older rental where the water damage sits next to pre-1980 materials doesn’t turn into three separate contractors and three separate schedules. ES America is insured $1M/$3M.
FAQ
Does a landlord have to pay for mold remediation?
Cost responsibility depends on state law, the lease, and what caused the moisture — this isn’t legal advice. In practice, mold caused by a building condition (a leak, roof, plumbing, or ventilation failure) is an owner repair, while damage from tenant misuse may be treated differently.
Do I need mold testing, or can we just remove it?
If growth is visible and the cause is known, testing isn’t always required to justify remediation — but assessment defines the scope, finds hidden moisture, and gives you a documented before-and-after. For a rental, that documentation is usually worth having.
How long does mold remediation take in an apartment?
It depends on the size of the affected area, whether materials must be removed, and how long drying takes — a small contained area may be days, while a larger job with structural drying and rebuild takes longer. ES America gives a timeline after assessing the unit, not before.
Do tenants have to move out during remediation?
Not always. Containment and negative air pressure are designed to isolate the work area so the rest of the unit stays usable. Whether occupants relocate depends on the size of the affected area, which rooms are involved, and the occupants’ circumstances.
Mold reported in a unit you own? Stop the water, don’t paint over it, and call Environmental Services of America at (404) 994-6006 for a mold assessment and documented remediation anywhere in Georgia, South Carolina, or Alabama. Request a quote online anytime.
By D.K.H. · Environmental Services of America (ES America) · Last updated July 2026