What Is the Epa's Guidance on Mold in Homes?

The Environmental Protection Agency's key message is that you cannot control mold without controlling moisture. Mold spores are everywhere, but they only grow where there is water or persistent dampness. The EPA advises that the most critical step is to find and fix the source of water or high humidity. Without this, any mold cleanup will be temporary, as the mold will return. This applies to leaks from plumbing, roofs, or foundations, as well as condensation from poor ventilation.

• Find and repair all plumbing leaks immediately.
• Dry any wet areas within 24 to 48 hours.
• Reduce indoor humidity with proper ventilation or dehumidifiers.
• Vent moisture-generating appliances, like dryers, to the outside.
• Clean and repair roof gutters to prevent water intrusion.
• Ensure the ground slopes away from your home's foundation.

For larger mold problems, or if mold returns after cleaning, the EPA recommends hiring a qualified mold assessment and remediation professional. This is also advised if the mold is in your HVAC system, if there is extensive water damage, or if you have health concerns. A professional has the equipment and training to contain the area and remove mold safely without spreading it. They can also perform testing to identify the mold type and the full extent of the contamination, which guides the proper cleanup method.

If you have water damage from a leak or flood, following EPA guidance means acting fast to prevent mold. This starts with removing standing water and wet materials. Then, you need thorough drying of the structure, which often requires professional-grade equipment like air movers and dehumidifiers. Moisture mapping can identify hidden dampness in walls or floors. The goal is to return the indoor humidity to normal levels, typically below 60 percent, to make the environment inhospitable for new mold growth.

• Extract all standing water promptly using pumps or wet vacuums.
• Remove and discard porous materials that cannot be dried quickly.
• Use fans and dehumidifiers to dry the remaining structure completely.
• Monitor humidity levels with a moisture meter to confirm dryness.
• Consider a professional inspection to ensure no hidden moisture remains.
• Keep the area well-ventilated during and after the drying process.