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CalEPA Vapor Intrusion Workgroup's 2026 Public Workshop Series

Vapor Intrusion: The Complete Picture from Fundamentals to Redevelopment - Working Together (5 Workshops)

The California Environmental Protection Agency (CalEPA) Vapor Intrusion Workgroup (CalEPA VI Workgroup or Workgroup) is pleased to host five virtual public workshops to share and gain input on CalEPA's efforts to address vapor intrusion at contaminated sites from February through June 2026. The CalEPA VI Workgroup is a multi-agency workgroup consisting of the Department of Toxic Substances Control (DTSC), the State Water Resources Control Board (State Water Board), the Regional Water Quality Control Boards, and the Office of Environmental Health Hazard Assessment (OEHHA) that serves as a technical and regulatory resource for addressing contaminated sites impacted by vapor intrusion across California.

The five upcoming workshops will cover a wide range of topics, including providing introductory training on vapor intrusion, taking a deep dive into vapor intrusion in the community and collaborative engagement, and technical presentations and discussions on a holistic approach to managing vapor intrusion sites. The technical sessions will cover development of conceptual site models, paths to closure, collective decision-making, and vapor intrusion data in GeoTracker and EnviroStor.

2026 Vapor Intrusion Workshop Series
(final dates are subject to change)

  1. Vapor Intrusion Cleanup Case Basics Training – Feb 12, 2026
  2. Vapor Intrusion in the Community – Feb 25, 2026
  3. Vapor Intrusion Holistic Approach Part 1: Conceptual Site Model and Best Practices – March 10, 2026
  4. Vapor Intrusion Holistic Approach Part 2: Conceptual Site Model to Paths to Closure and Collective Decision-Making – May 2026
  5. Vapor Intrusion Data – June 2026

Please register for each workshop you wish to attend using the separate Zoom links provided below.

All five workshops will be held virtually on the Zoom platform with no physical location. All workshops will be recorded and links to the recordings will be posted online.

Registration

Workshop 1 – Vapor Intrusion Cleanup Case Basics Training
February 12, 2026
10:00 a.m. – 12:00 p.m. PST
Via Video and Teleconference Only (Zoom)
No Physical Meeting Location
Workshop will be recorded.

Zoom registration is required:

Vapor Intrusion Cleanup Case Basic Registration

Workshop 2 – Vapor Intrusion in the Community
February 25, 2026
1:00 p.m. to 3:30 p.m. PST
Via Video and Teleconference Only (Zoom)
No Physical Meeting Location
Workshop will be recorded.

Zoom registration is required:
Vapor Intrusion in the Community

New! Workshop 3 – Vapor Intrusion Holistic Approach Part 1: Conceptual Site Model and Best Practices
March 10, 2026
9:00 a.m. to 11:30 a.m. PST
Via Video and Teleconference Only (Zoom)
No Physical Meeting Location
Workshop will be recorded.

Zoom registration is required:
Registration link for Vapor Intrusion Holistic Approach Part 1

Past CalEPA Vapor Intrusion Workshops

CalEPA Vapor Intrusion Workgroup’s Public Workshop Series - Kickoff Workshop