Molds are fungi that can be found everywhere, and exposure can cause allergic responses in sensitive individuals including symptoms such as sneezing, runny nose, red eyes, and skin rash. They reproduce by means of spores that are invisible to the naked eye and float through outdoor and indoor air. These fungi can grow on almost any substance where moisture is present. Molds can grow on ceilings, walls, under sinks, drywall, ductwork, furniture, and wood, among other materials. When there is a lot of moisture present, high humidity, and temperatures are above 65°F, mold spores become active and start to grow rapidly. There are many types of mold, and none of them will grow without water or moisture. Outdoors, molds can break down dead organic matter, such as fallen leaves and dead trees. There is no practical way to eliminate all mold and mold spores in the indoor environment. The key to controlling indoor mold growth is controlling the moisture source.
NOTE: VDH does not have the capability to provide environmental testing or remediation for mold problems, or provide legal advice. Concerned citizens are advised to follow the practical advice given on this site, refer to additional resources, and if necessary, consult an environmental specialist.
General Information
Those who are more likely than others to develop symptoms from mold exposure include young children, the elderly, pregnant women, and people with asthma or other respiratory diseases. People with suppressed immune systems (e.g. HIV/AIDs infection, organ transplant patients, chemotherapy patients) should avoid heavy mold infestations. If possible, susceptible individuals should not live in buildings where mold is growing, and should consult their family physician if symptoms develop or persist.
Black Mold
School Mold Reporting
Mold Remediation in Schools
For Help With Mold
The Virginia Residential Landlord and Tenant Act (Sections 55.1-1200 through 55.1-1262 of the Code of Virginia) establishes the rights and obligations of residential landlords and tenants in the Commonwealth, but only the courts can enforce those rights and obligations. As of July 1, 2026, Section 55.1-1259 authorizes a city or county to bring action on behalf of tenants when a landlord fails to maintain a dwelling in a fit and habitable condition. For more information and to review the Act, please click on Virginia Residential Landlord and Tenant Act.
Homeowners
Commercial Buildings
Tourist Lodgings
Mold Remediation and Inspection
Mold Cleanup and Prevention
- Fix leaks promptly, eliminate sources of moisture, and clean up the mold
- Clean and dry or wet building materials and furnishings within 24-48 hours of a flood or leak
- Use air conditioners and/or dehumidifiers
- Inspect and repair the ventilation system
- Reduce humidity at (try to achieve 30 to 60 percent)
- Use exhaust fans to circulate indoor moisture (from cooking, dish-washing, showering) to the outdoors; and remove carpeting in areas of excess moisture (from cooking, sinks, bathtubs and showers)
- Add insulation to reduce the potential for condensation on cold surfaces (i.e., windows, piping, exterior walls, roof, or floors)
Clean-up
Clean-up After a Flood