Mold after a flood or hurricane: the 72-hour, 2-week and 60-day plan

Why does mold follow every flood?

Floods soak a house faster than it can dry. Mold spores are already present in every home, and EPA says they begin growing when they land on wet surfaces. EPA’s guidance is to dry water-damaged areas and items within 24 to 48 hours to prevent growth. After a flood, that is rarely possible for the whole house.

EPA’s flood fact sheet says “when things remain wet for more than two days, they usually get moldy.” The federal Homeowner’s and Renter’s Guide to Mold Cleanup After Disasters, written by EPA, CDC, FEMA, HUD and NIH after Hurricane Sandy, goes further. If you were not able to dry your home and belongings within 24 to 48 hours, “you should assume you have mold growth.”

Floodwater also brings its own problems. EPA warns it “may have carried sewage or chemicals into your home.” That is why flood cleanup is treated differently from a clean-water pipe leak, and why porous materials soaked by floodwater usually have to go.

The plan below breaks recovery into three stages: the first 72 hours, the first two weeks and the first 60 days. The stages are a planning frame. The deadlines inside them come from the agencies cited. For the emergency steps alone, see what to do after a flood. For mold basics, start at the mold hub.

Stage 1, the first 72 hours: what do you do first?

The first three days are about safety, documentation and getting water and wet materials out.

Before you go in

1. Return only when officials say it is safe. Federal guidance says wait until professionals confirm no structural, electrical or other hazards.
2. Check for downed power lines and gas leaks. Make sure electricity and gas are off (EPA disaster guide).
3. Look for sagging ceilings or floors before you walk under or on them.
4. Put on at least an N95 respirator, goggles and protective gloves. For long work, such as tearing out drywall, the federal guide recommends a half-face or full-face respirator.
5. Keep children out. The federal guide says children should not take part in disaster cleanup.

Once inside

6. Contact your insurers and photograph the home and belongings before cleanup (EPA disaster guide).
7. Remove standing water with a wet vacuum.
8. Open doors and windows, closets, cabinets and the attic access to move air.
9. When power is safe, run fans and dehumidifiers. Stop using fans in any area where mold has started, because they may spread it.
10. Start pulling out wet carpet, pads, mattresses and upholstered furniture. Photograph them first.

Run any generator outside, at least 20 feet from the house, and never in a garage (EPA disaster guide).

Stage 2, days 4 to 14: how do you clean and dry the house?

By the end of the first week, the goal is a house stripped of wet porous materials and actively drying.

Remove what cannot be saved. The federal disaster guide says to “throw away anything that was wet with flood water and can’t be cleaned and dried completely within 24 to 48 hours.” In practice that usually means:

Clean what stays. Federal guidance says clean with water and a detergent, remove all mold you can see and dry right away. Do not mix cleaning products. Never mix bleach and ammonia. EPA does not recommend bleach as a routine practice.

Keep drying. Wall cavities, subfloors and framing take time. Use a moisture meter to track progress. The Florida Department of Health in Volusia County notes that dehumidifiers only work under closed indoor conditions, so close up the house when they run.

See flood cleanup for a room-by-room walkthrough and mold on drywall for how much wall to cut.

Stage 3, through day 60: claims, remediation and rebuilding

File the paperwork. If you have NFIP flood insurance, FEMA says to submit your proof of loss form “within 60 days after the date of loss.” Ask your flood insurer about the deadline for your claim and what documentation they need. Homeowners claims for wind and rain damage follow your policy and state law. See the Florida rules below.

Hire for the work you cannot do. Large areas of mold, contaminated ductwork and soaked wall systems are professional jobs. EPA says to hire for areas over about 10 square feet or when the damage came from contaminated water. The federal disaster guide suggests professionals affiliated with or certified by NEHA, AIHA, IICRC or ACAC. Your state may also license mold work.

Confirm cleanup before you close walls. The federal guide says you are not done if you still see or smell mold, and that “a careful inspection of the work area for completion of the cleanup and absence of mold-related odors is usually appropriate.” Sampling is not usually recommended, but surface sampling can help confirm an area was adequately cleaned (EPA). See clearance testing.

Rebuild only when it is dry. New drywall over wet studs traps moisture and invites mold back. Check readings before insulation and wallboard go up.

How do you know if hidden mold is growing weeks later?

Mold after a flood often shows up after the obvious cleanup is done. The federal disaster guide notes mold “may also be hidden under or behind items like carpet, cushions, or walls.” Watch for these signs in the weeks after:

• A musty smell that returns, especially when the house is closed up.
• Stains or spots on walls you did not remove.
• Warped flooring or soft spots in subfloors.
• Mold on furniture or stored items you kept.
• Worsening asthma or allergy symptoms at home. The federal guide says health problems that get worse when you return home may mean mold remains.

If the heating and cooling system took on water, or the ducts ran through a flooded crawl space or garage, have it inspected before you run it. EPA says do not run a system you suspect is contaminated. See mold in HVAC. For more clues, see signs of mold.

What is different after a hurricane in Florida?

Florida adds licensing, claim timing and climate to the usual flood steps.

Hire licensed mold contractors. Florida licenses mold assessors and remediators through the Department of Business and Professional Regulation (DBPR). After Hurricane Ian, the Florida Department of Health in Volusia County advised residents to hire contractors licensed by the state or county and to check the DBPR license search under “Mold Related Services.” Florida law also bars a mold assessor from remediating a property it assessed within 12 months (Florida Statutes 468.8419), with a narrow exception for certain licensed contractors.

Know the claim clock. Under Florida Statutes 627.70132, a property insurance claim is barred unless notice is given to the insurer within 1 year after the date of loss. A supplemental claim has 18 months. For hurricanes, the date of loss is the date the hurricane made landfall. Your policy may require faster notice, so read it.

Plan for humidity. Florida’s warm, humid air works against drying. EPA’s prevention guidance says to increase ventilation when outdoor air is cold and dry, and to dehumidify when outdoor air is warm and humid. Once power is safe, run dehumidifiers with the house closed up, and use air conditioning to help keep indoor humidity below 60 percent (EPA).

Skip the test. The Florida Department of Health does not recommend mold testing or sampling to see if you have a mold problem.

What Hurricane Isaias means for Panhandle homes

Hurricane Isaias made landfall near Destin, Florida, around 8:30 p.m. CDT on October 9, 2026, as a Category 2 hurricane with maximum sustained winds of 105 mph, according to the National Weather Service in Mobile/Pensacola. The NWS reports widespread rainfall of 5 to 8 inches across parts of the western Florida Panhandle, with a peak of 11.65 inches near Mary Esther, plus storm surge flooding along the Okaloosa County coast.

For homes that took on water, the 24-to-48-hour drying window has passed. Follow the federal advice to assume mold where materials stayed wet, and move through Stages 2 and 3 above. Under Florida Statutes 627.70132, the date of loss for Isaias claims is the landfall date. Our Hurricane Isaias page tracks event-specific resources.

How do you avoid scams during flood recovery?

Demand for cleanup crews spikes after every storm, and so do bad actors. Before you sign:

• In Florida, verify the mold license on the DBPR site and check that the remediator is not also the company that assessed the job.
• Get a written scope and price before work starts.
• Be wary of large upfront payments and pressure to sign the same day.
• Read any assignment of benefits or direction-to-pay form carefully before signing. Ask your insurer or an attorney if you are unsure.

See storm chaser scams for red flags and FEMA disaster assistance if your county has a federal declaration.