Official 2026 Data Sources: NOAA • EPA • Census Bureau

National Mold Index

The central database for environmental toxicity, remediation standards, and biological risk assessment.

↓ Locate Your State

State Risk Map

Select your state to view granular ZIP-code humidity data, rainfall history, and housing risk scores.

Low Risk (<3.0)

Moderate (3.0-5.9)

High (6.0-7.9)

Severe (>8.0)

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

Warning: Hidden Mold Risk

Water damage is often invisible inside wall cavities. Check your state data above first, then use our audit tool to check your specific property address.

Start by Selecting Your State ↑