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Vapor Intrusion

Water Boards’ Vapor Intrusion (VI) Webpage

This webpage provides a central point where information is communicated to the public regarding vapor intrusion (VI). This webpage provides general information about VI including workshops and modules, links to VI guidance documents, announcements for the proposed VI amendment and current Water Board events, and links to other VI resources.

The Water Boards’ VI Team is a group of technical and support staff within the State Water Board Divisions of Water Quality and the Regional Water Quality Control Boards.

The Water Boards’ VI Team supports the California Environmental Protection Agency Vapor Intrusion Workgroup (Department of Toxic Substances Control, Office of Environmental Health Hazard Assessment, and California Water Boards’) vapor intrusion efforts.

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- Toxic vapors in indoor air can come from multiple sources – underground contamination, consumer products or outdoor air. Vapors can travel between soil particles and reach ground surface.

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