Publication Date: 
Sunday, April 1, 2018

Soil vapor intrusion is caused when the fumes from underground naturally-occurring and anthropogenic chemicals migrate inside a building. A number of states have enacted laws, regulations, and/or policy standards concerning the soil vapor intrusion pathway for chemicals that can migrate from contaminated soils and groundwater into indoor air from the subsurface. These measures are designed to protect the public’s health, and in some cases worker safety, although the method of regulation and the standards set vary from state to state.

This map identifies and displays a cross-sectinal dataset of key features of how states address the volatilization of chemicals of concern from subsurface soils to indoor air during the soil vapor intrusion pathway across all 50 states and the District of Columbia as of August 1, 2017.