Mold after a leak in a rental: the first 48 hours decide the bill
Why the first 24 to 48 hours after a leak decide whether a rental gets mold, what to throw away, when to call a pro and what to log on the work order.
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A leak under a sink is a plumbing job. The same leak, left wet for a week, becomes a mold job, a drywall job and an unhappy tenant. The difference is mostly time. The U.S. EPA says water-damaged areas and items should be dried within 24 to 48 hours to prevent mold growth, so the clock that matters starts when the water is found, not when the plumber arrives.
Hour zero: stop the water and write it down
- Ask the tenant to shut off the water at the fixture or the main, and to keep clear of any outlet or light near the water
- Write down when the leak was reported and when the water was shut off
- Ask for photos of the wet area: the floor, the cabinet base and any stain on the wall or ceiling
- Book the plumber for the source and, if materials are soaked, someone to dry them out
The EPA also asks renters to report all plumbing leaks and moisture problems to their building owner or manager right away. Make that easy. A tenant who can text a photo at 10:00 PM ET reports the drip on the day it starts, not the day the cabinet floor gives way.
Day one and two: dry it, then check it
Fixing the pipe does not dry the cabinet. Open doors, pull out what is stored underneath, run fans or a dehumidifier and remove anything soaked that can’t be dried. The EPA is direct about the order: if you clean up mold but don’t fix the water problem, the mold will most likely come back.
Small patch or a professional?
| What you find | What the EPA guidance points to |
|---|---|
| Mold on a hard surface, smaller than about 10 square feet | Usually a cleanup your own team or vendor can handle |
| Mold over a larger area, or after heavy water damage | Its guidance for larger buildings, or a professional with that experience |
| Mold that keeps coming back in the same spot | A water problem that was not fixed. Find the source first |
The EPA’s cleanup page adds three cases where a professional is the safer call whatever the size: when the water was sewage or otherwise contaminated, when anyone in the home has health concerns, and when the heating and cooling system may be contaminated. In that last case, don’t run the system, because it could spread mold through the building. If you hire a contractor, the EPA suggests checking references and asking them to follow its remediation guidance or the guidelines of a professional body such as the IICRC.
What can be cleaned, and what has to go
Hard surfaces can usually be scrubbed with detergent and water and dried completely. Porous materials are harder. The EPA notes that ceiling tiles and carpet may have to be thrown away if they become moldy, because mold fills the spaces in them. The New York State Department of Health puts it more firmly: porous materials with extensive mold growth, such as drywall, carpeting, paper and ceiling tiles, should be discarded, and so should any wet material that can’t be cleaned and dried thoroughly.
Two shortcuts make it worse. Painting or caulking over mold doesn’t work: the EPA says to clean and dry the surface first, because paint over mold is likely to peel. And bleach is rarely the answer on its own. The New York guidance says bleach may not be necessary where an area can be kept dry, because mold can’t grow without moisture.
Do you need a mold test?
Usually not. The New York State Department of Health says mold testing is not recommended, nor required by any regulatory agency, and that there is no state or federal standard for mold in homes. Testing can cost more than cleaning up and fixing the water problem, and knowing the kind of mold doesn’t change what to do. Spend the money on the plumber and the drying instead, and keep the photos.
When the tenant says it keeps coming back
Mold that returns in the same spot is a water problem that wasn’t fixed. In bathrooms, the EPA says more ventilation, from a fan or an open window, and more frequent cleaning usually keep mold to a minimum. Anywhere else, look for the source: a slow leak behind a wall, a roof or window leak, or condensation on a cold pipe. The New York guidance tells tenants to ask the landlord to inspect and repair persistent mold or water damage, and to call the local code enforcement office if it isn’t fixed. A second report deserves a second visit, not a reminder to clean.
What goes on the work order
| Field | What to record | Why it matters |
|---|---|---|
| Reported | The time the tenant reported the leak, and how | Many state repair clocks start at notice |
| Water off | When the water was shut off, and by whom | Shows how fast the damage was stopped |
| Source | What leaked, who fixed it and when | Mold comes back if the source isn’t fixed |
| Drying | When drying started and when it was checked dry | The EPA’s 24 to 48 hour window |
| Mold found | Where, on what material and roughly how many square feet | Decides cleanup in-house or a professional |
| Removed | Any drywall, carpet or ceiling tile thrown away | The owner sees it on the invoice |
| Photos | Before, during and after, with the date | Answers questions from the owner or an insurer |
| Confirmed | The tenant’s confirmation that the area is dry and clean | Closes the loop before the work order closes |
That record answers the owner’s first question, what happened and when, and it is the timeline you would want if anyone asks later. The work order template has a field for each of these, and explaining an emergency repair to an owner shows how to turn them into the owner’s message. Your state may also set how fast a repair has to start after notice: see repair timelines by state.
Where Now Ours fits
Ours answers tenants at any hour in your company’s name, asks the safety questions you set and asks for photos. It offers the job to your technicians first, then your vendors, books the visit and keeps the work order open until the tenant confirms the fix, or the vendor or technician marks it done with a photo or note. Every message is recorded on the case with the time.
Sources
- U.S. EPA, A brief guide to mold, moisture and your home: drying within 24 to 48 hours, fixing the water problem first, the 10 square foot guide and reporting leaks to the building owner or manager. Checked October 21, 2026.
- U.S. EPA, Mold cleanup in your home: contaminated water, HVAC systems, porous materials, painting over mold and bathroom ventilation. Checked October 21, 2026.
- New York State Department of Health, Mold and your home: what you need to know: discarding porous materials, testing, bleach and what renters can ask for. Checked October 21, 2026.