Event detail icon
Comment Period

Draft Guidance for Evaluating Vapor Intrusion in Washington: Investigation and Remedial Action

open for public comment

Nov. 23, 2021 - Dec. 20, 2021, 11:59 p.m.

Vapor intrusion can pose a threat to people's health. You're invited to comment on updated guidance that helps cleanup project managers, consultants, and potentially liable persons assess if vapor intrusion might pose a threat to people and indoor air.   

When volatile hazardous substances such as gasoline or solvents are released into the environment, they can contaminate soil and groundwater and form chemical vapors. The process by which these chemical vapors migrate into indoor air is called vapor intrusion. When it occurs, there's the potential for people to be exposed if there are occupied buildings in the vicinity of the contamination, or if buildings are constructed in the area in the future.

Read the draft guidance.

Comment online icon

Comment online

Questions icon


Mark Gordon, P.E.
Environmental Engineer

To request ADA accommodation, contact Ecology's ADA Coordinator by email at ecyadacoordinator@ecy.wa.gov, or call 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). More about our accessibility services.