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Wisconsin Department of Health Services

Chemical Vapor Intrusion and Residential Indoor Air

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Guidance for Environmental Consultants and Contractors

Sites with volatile organic compound (VOC) contamination are potential public health hazards.  Contact with contaminated soil and the contamination of drinking water are widely recognized pathways of exposure.  One commonly overlooked pathway involves VOC movement from groundwater or soil into nearby building foundations, and then into the indoor air that people breathe.  This pathway is commonly known as chemical vapor intrusion.

The Wisconsin Division of Public Health (DPH), Department of Health Services (DHS) has developed guidance for environmental consultants and contractors addressing chemical vapor intrusion questions.  Basic vapor intrusion concepts are reviewed in an effort to develop a simplified, pragmatic approach to addressing this exposure pathway.  DHS guidance is intended to compliment regulations and policies of cleanup programs in the Department of Natural Resources (DNR) and Department of Safety and Professional Services.

Additional Resources


Last Revised:  November 16, 2012