What's Your Home's Mold Risk?
Enter your ZIP code for a free, instant mold risk report based on local climate data, housing age, and rainfall patterns.
What Affects Your Home's Mold Risk?
Humidity
Mold thrives above 60% relative humidity. Areas with consistently high humidity face year-round risk, especially in enclosed spaces like basements and crawl spaces.
Rainfall
Heavy annual rainfall increases the chance of water intrusion through foundations, roofs, and windows. Areas with 35+ inches annually see significantly more mold issues.
Home Age
Older homes often have weaker moisture barriers, outdated ventilation, and aging plumbing. Homes built before 1980 are especially vulnerable to hidden mold growth.
Frequently Asked Questions
How accurate is this risk score?
Our score is based on NOAA climate data (humidity and rainfall averages) and US Census housing data (median construction year). It reflects your area's general environmental risk — not the condition of your specific home. A professional inspection is the only way to confirm actual mold presence.
What should I do if my score is high?
A high score means your local climate makes mold growth more likely. Consider a professional inspection, especially if your home is older, has a basement or crawl space, or has experienced any water damage. Take our free assessment for a personalized recommendation.
Does a low score mean I'm safe?
Not necessarily. Even in dry climates, water leaks, poor ventilation, or flood events can create mold conditions. A low score means your area's baseline risk is lower — but no home is immune.
Where does your data come from?
Humidity and rainfall data comes from NOAA Climate Normals and the Open-Meteo historical weather API. Housing age data comes from US Census American Community Survey estimates. Cost ranges are based on industry data for each metro area.