Nearly Half Of US Homes Harbor Hidden Mold, But Americans Underestimate Problem, Survey Finds

Nearly one in four Americans worry their homes may be unsafe for their health, with mold emerging as a hidden threat in far more households than many realize.

A new survey of 2,000 U.S. adults found that while most respondents believed American homes were largely “up to code” (80%), the reality is more concerning. Homeowners were more likely than renters to believe their homes were safe (86% vs. 73%). When asked to estimate how widespread mold is, respondents put the number at 37% of homes, and 43% thought it was even lower.

In fact, federal health officials say mold is present in nearly half of U.S. homes — 47%, according to the National Institute for Occupational Safety and Health.

The survey, conducted by Talker Research for Rainbow Restoration, revealed a gap between perception and reality. While 77% of respondents said they had never experienced mold in their own homes, many admitted seeing telltale signs such as water stains (21%), peeling paint (20%) and musty odors (19%). A quarter reported spotting two of the most common types: stachybotrys chartarum (25%) and alternaria (23%).

Despite 76% of respondents feeling confident they could recognize mold, only 25% could correctly identify the most common types. And 39% admitted they do not inspect their homes annually, even though moisture-prone areas like bathrooms (63%), basements (44%) and kitchens are most at risk.

“Mold thrives in damp and poorly ventilated areas in a home. Areas highly susceptible to mold growth are bathrooms, kitchens and basements, as well as around any windows or doors,” said Josh Miller, president of Rainbow Restoration, a Neighborly company. “Mold can cause serious health problems if left untreated, so its important to be aware of indicators your home may be infected. This includes smelling a musty odor in a room with no clear cause, noticeable signs of water damage like peeling paint or damp surfaces, as well as seeing visible traces of mold around walls and corners of the home.”

The survey also highlighted gaps in public understanding of mold-related health risks. Many recognized symptoms like coughing (44%), wheezing (39%) and sneezing (36%), but few associated mold exposure with less obvious problems such as hair loss (8%), abdominal or muscle pain (9%), or ringing in the ears (5%).

Emergency preparedness plans often overlook mold. Just 7% of respondents said they consider it a top concern, though 18% discovered mold in their homes after experiencing a natural disaster within the past year.

“Mold growth is a side-effect of natural disasters, such as extreme flooding and torrential rains. It can spread rapidly if untreated and owners should take immediate action if they experience any kind of water damage,” Miller said. “While 49% of respondents said they would immediately call in a professional for mold concerns, 40% would try to handle it themselves. DIY mold removal methods are ineffective and the only way to remediate the problem is by working with trained professionals who can safely eliminate the mold completely and prevent it from returning.”