Mold Guides
7 Signs You Need Mold Remediation in a Florida Home
A small patch of mold in a shower corner is a cleaning job. Mold that is large, wet, inside the air conditioning, or back after scrubbing is a different job. These are seven signs that a Florida cleanup has become a case for professional remediation, with the sources behind each one.
How do I know if I have mold in my house?
Mold usually shows itself by sight or smell: visible spots in any color, or a musty odor near a place that stayed wet. The EPA says sampling is usually unnecessary when growth is visible, and the CDC says you should remove mold you see or smell without first identifying the type.
Check ceilings under bathrooms and roof lines, the wall behind a toilet or washer, closets on exterior walls, and the area around air conditioning vents, especially after a leak, a storm, or a stretch without power. Hidden growth after a leak is covered in our guide tosigns of hidden water damage and mold. This page starts one step later: you have found mold and need to decide how big a response it calls for.
Seven Signs the Job Is Beyond a DIY Cleanup
No single sign proves a house is unsafe. Each marks a point where the EPA, the CDC, or Florida law stops treating mold as a household chore.
The mold covers more than about 10 square feet
The EPA says that if the moldy area is less than about 10 square feet, roughly a 3 foot by 3 foot patch, you can in most cases handle the job yourself. A lot of water damage, or growth over 10 square feet, moves the job to its guide for larger remediation. Florida law uses the same line: s. 468.8411 defines mold assessment and mold remediation by reference to mold growth of greater than 10 square feet, and the state licenses that work. A standard 4 foot by 8 foot sheet of drywall is already 32 square feet.
The air conditioning system is involved
The EPA says not to run the HVAC system if you know or suspect it is contaminated with mold, because it could spread mold throughout the building. Florida air conditioners run for much of the year, so a problem there can reach every room. Growth at a vent, mold around the air handler, or a musty smell whenever the system starts are reasons to get qualified help quickly. For ducts, the EPA points to its guidance on whether to have air ducts cleaned.
The water behind it was sewage or floodwater
The EPA says that if sewage or other contaminated water caused the damage, you should call in a professional with experience in buildings damaged by contaminated water. In Lee County that means sewage backups and storm surge or floodwater, such as the surge Hurricane Ian pushed up the Caloosahatchee River in 2022. OurFort Myers water damage guide covers the surge figures and the repair side.
The mold comes back after you clean it
The EPA says a cleanup is not finished until the moisture problem is completely fixed, and that visible mold and moldy odors should be gone. Growth that keeps returning means the source is still there or the material cannot be cleaned. Typical hidden sources are a plumbing leak in a wall, a roof or window leak, and a clogged air conditioner condensate line. A bathroom that stays damp is the exception: the EPA suggests more ventilation and more frequent cleaning there.
The mold is in drywall, ceiling tile, carpet, or other absorbent material
The EPA says porous materials such as ceiling tiles and carpet may have to be thrown away if they become moldy, because mold can grow into them and may be difficult or impossible to remove completely. The EPA also says killing mold is not enough, since dead mold may still cause allergic reactions. It must be removed, which is where cleanup becomes remediation.
Someone in the home has symptoms or belongs to an at-risk group
Symptoms alone do not show that mold is the cause, and this page cannot diagnose anyone. The Florida Department of Health names babies and children, elderly persons, people with chronic respiratory conditions, allergies, or asthma, and people with weakened immune systems as groups of special concern, and says to consult a medical doctor if you feel your health is affected. Ask a doctor, not a website.
Wet materials stayed wet for more than 48 hours
The EPA says to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth, and the Florida Department of Health says common molds can take hold when water stands for even 24 hours. Florida humidity makes that harder, and after a hurricane the power may be out. If drywall or carpet stayed wet past two days, assume growth may have started. Seehow long water damage takes to dry out.
Is it worth doing a mold inspection?
Sometimes. The Florida Department of Health does not recommend testing to learn whether you have a mold problem, and the EPA says sampling is usually unnecessary when growth is visible. An assessment can make sense when moisture is hidden, the area is greater than 10 square feet, or you want an independent check after cleanup.
The EPA says surface sampling may be useful to determine whether an area has been adequately cleaned or remediated, which is the second use of an assessor: confirming the job is done.
In Florida an assessment is a regulated service. The Department of Business and Professional Regulation licenses mold assessors and mold remediators, and applicants must pass an approved written exam. Under s. 468.8411, an assessment includes physical sampling and a detailed evaluation of building history and inspection data about mold growth of greater than 10 square feet. Check the license before you pay.
The rule most homeowners miss is in s. 468.8419: a mold assessor, or the assessor's company, may not perform or offer to perform mold remediation on a structure it assessed within the last 12 months. The statute makes an exception for a certified contractor classified as a Division I contractor, and it bars an assessor from accepting or offering compensation for referring business. The company that tells you how big the problem is should not be paid more when the answer is bigger. OurFort Myers mold remediation guide walks through the rule, and the page on mold remediation cost in Floridacovers the money side.
Is black mold common in Florida?
Florida humidity makes damp conditions common, but no source cited here counts how often Stachybotrys chartarum, the species called black mold, appears in homes. Color alone does not identify a species or a risk. The CDC says all molds should be treated the same for health risk and removal.
The name black mold usually refers to Stachybotrys chartarum, which the CDC describes as a greenish-black mold that grows on high-cellulose material such as fiberboard, gypsum board, and paper and needs constant moisture. That is why a dark spot on wet drywall paper gets the label. But the label is not a test: the EPA notes that molds come in many colors, and the CDC says you do not need to know the type of mold to remove it.
The CDC says that if Stachybotrys chartarum or other molds are found in a building they should be removed. The Florida Department of Health adds that the effects of certain so-called toxic molds are not well understood and that all indoor mold growth should be removed promptly, no matter what type. So color does not change the plan: fix the moisture, remove the growth, and let the size of the area decide whether it is a DIY job.
What To Do Next
If two or more of these signs apply, stop disturbing the area, find and stop the moisture source, and take dated photos before anything is cleaned or removed. Then check licenses before you sign, using the steps in our mold remediation guide. Two companion guides cover what usually comes next:what actually kills mold and what only hides it, andthe difference between mold removal and mold remediation.
Frequently Asked Questions
Can I clean up mold myself in a Florida home?
Often yes, when the area is small. The EPA says that if the moldy area is less than about 10 square feet, you can in most cases handle the job yourself. It says to call in a professional when the damage came from sewage or other contaminated water, and not to run the HVAC system if you know or suspect it is contaminated with mold.
Does bleach get rid of mold?
The EPA does not recommend chlorine bleach or other biocides as a routine step in mold cleanup, and says killing mold is not enough because dead mold may still cause allergic reactions. The mold has to be removed and the moisture problem fixed. The EPA also warns never to mix chlorine bleach with cleaners that contain ammonia.
Who is allowed to remove mold in Florida?
Florida licenses mold assessors and mold remediators through the Department of Business and Professional Regulation. Under s. 468.8411, the statutory definitions of both services apply to mold growth of greater than 10 square feet. Check any license with the department before you sign.
Can the same company inspect my home and remove the mold?
Generally no. Section 468.8419 bars a mold assessor, or the assessor's company, from performing or offering to perform mold remediation on a structure that it assessed within the last 12 months. The exception is a certified contractor classified as a Division I contractor.
Should I see a doctor if I think mold is affecting my health?
The Florida Department of Health says people with special health concerns should consult a medical doctor if they feel their health is affected by indoor mold, and the EPA says to consult a health professional before starting cleanup if you have health concerns. Symptoms alone do not show that mold is the cause.
How quickly can mold start growing after water damage?
The Florida Department of Health says common molds can take hold when water stands for even 24 hours. The EPA says to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth.
Last reviewed by the Canal City Restoration editorial team.