Welcome to the Association of Vapor Intrusion Professionals

AVIP is a community of professionals dedicated to advancing the industry and science of vapor intrusion. The purpose of this association is to promote the establishment of accepted and recognized best practices for vapor intrusion professionals, provide contextual knowledge, and serve as a resource of information for the general public.

Available now: "Mastering the EPA Vapor Intrusion Screening Level (VISL) Calculator"

We are excited to announce the release of our next course, created in collaboration with CERTI, titled, "Mastering the EPA Vapor Intrusion Screening Level (VISL) Calculator." The course is available through this link. 

AVIP members receive a 10% discount on these courses. Click this link for the member discount code.

AVIP 2027 – We're Heading to Anaheim, California!

October 3–6, 2027 | Anaheim, California

What an incredible conference we had in Orlando!

A heartfelt thank you to everyone who helped make AVIP's 5th Annual Vapor Intrusion Conference such a tremendous success!

From outstanding technical presentations and interactive workshops to hands-on VI Labs, engaging discussions, and valuable networking opportunities, this year's conference was a wonderful reminder of what makes our vapor intrusion community so special.

To our attendees, presenters, sponsors, exhibitors, volunteers, and everyone who shared their knowledge, enthusiasm, and support — we truly appreciate you!

Anaheim, Here We Come!

We're already looking forward to bringing everyone together again for the 6th Annual AVIP Vapor Intrusion Conference, October 3–6, 2027, in Anaheim, California!

And while we're still working on the exciting details for next year's event, there's one thing you can do right now!

Reserve Your Hotel Room Early!

Our conference hotel sold out quickly in 2026, so don't wait to secure your accommodations for Anaheim!

BOOK YOUR AVIP 2027 HOTEL ROOM

Stay tuned for registration information, program announcements, and more details in the coming months.

Thank you for being part of the AVIP community. We can't wait to see you in Anaheim!

#AVIPCA27

AVIP Best Practices

The Association of Vapor Intrusion Professionals (AVIP) is working in collaboration with a variety of stakeholders (e. g., regulators, environmental consultants, mitigation specialists, insurance providers, academia, laboratories, attorneys, etc.,) to develop a series of peer-reviewed best practice documents for the vapor intrusion industry.

The Benefits of Membership

  • Increased Visibility in the Industry 
  • Searchable Profile - "Find a Professional"
  • A Voice in standards of practice for federal and state regulations
  • VI Community 
  • Access to updated Regulations and Standards 
  • State and Local Government Contact Information for VI
  • Training
  • Certification
  • Search for VI Vendors/Suppliers
  • Discount on AVIP Conferences
  • Discount on All Training
  • Networking Events
  • Member Events
  • Locate a Member
  • Sign up for Alerts
  • Use of the Approved AVIP Logo Badge for Members and Sponsors
Join now!

What Is Vapor Intrusion?

Vapor intrusion occurs when there is a migration of vapor-forming chemicals from any subsurface source into an overlying building. Recognition of soil vapor intrusion to buildings and other enclosed spaces occurred in the 1980s with concerns over radon intrusion. Subsequently, there was an increasing awareness that anthropogenic chemicals (e.g., petroleum hydrocarbons and chlorinated solvents) in soil, groundwater, and sewers and drainlines could also pose threats to indoor air quality via the vapor intrusion pathway.

Vapor-forming chemicals may include:

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