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For information on vapor intrusion, contact:
Alyssa Sellwood
Remediation & Redevelopment Program

Vapor intrusion resources for environmental professionals

Screening for the vapor intrusion pathway must be conducted at every contaminated site in Wisconsin. This page provides resources to help environmental consultants screen the vapor pathway, assess vapor risk and, where necessary, investigate and mitigate vapor intrusion at specific buildings. General information about vapor intrusion for property owners, tenants and the general public is available on the vapor intrusion page.

Community outreach

Community outreach

An effective outreach strategy that anticipates the needs and concerns of affected property owners and the community at large is important when vapor intrusion is involved. When citizens are well-informed about the issues surrounding a site, their questions and concerns can be more effectively addressed. Early two-way communication is essential for a successful investigation and mitigation effort. The following model letters and fact sheets are available for use with your outreach communications.

Template/model letters

The DNR created template letters to help environmental professionals communicate vapor intrusion investigations with affected property owners in plain, easily understood languauge. Because of the complex nature of vapor intrusion investigations, it is not possible to create a template letter for every situation. These template letters are yours to use as you see fit, in whole or in part.

Request for access to sample
Sample results
Request to install mitigation system

DNR fact sheets

These fact sheets are intended to help environmental consultants and responsible parties communicate critical information about the vapor intrusion pathway to affected property owners. The fact sheets can be used in conjunction with template letters or as stand-alone documents.  When planning an outreach strategy, decide which fact sheets and other tools best support the information you want to communicate to neighbors and other interested parties.


Guidance on addressing vapor intrusion

Vapor migration is a contaminant pathway that needs to be evaluated like other pathways. Its evaluation is required by NR 716.11(5)(a), (b), (g) and (h), Wis. Adm. Code.

DNR guidance
Supplemental resources
EPA guidance

Please note that the vapor screening levels found in the “Tables” section of EPA's 2002 guidance are out of date. To determine Wisconsin's vapor action levels for indoor air and vapor risk screening levels for sub-slab, soil gases and groundwater, please see the “screening levels” tab on this page.

DHS guidance
ITRC guidance

Screening levels

Quick look-up table of Indoor Vapor Action Levels (VALs) and Vapor Risk Screening Levels (VRSL)

Indoor air vapor action levels (VALs) are based on U.S. EPA's Regional Screening Level Tables [exit DNR], applying a 1 x 10-5 excess lifetime cancer risk or HI -1. The Quick Look-Up Table below is for VOCs frequently encountered on remediation sites. This table is updated semi-annually.

The Quick Look-up Table for VALs and VRSL [PDF] provides:

  • indoor air VALs for VOCs frequently encountered on remediation sites;
  • sub-slab vapor risk screening levels (VRLS) for three building categories (residential, small commercial and large commercial/industrial for these common VOCs);
  • a formula for converting from ppbv to mg/m3;
  • links and formula for determining VALs for other VOCs;
  • attenuation factors for four screening media (crawl space, sub-slab, soil gas and groundwater); and
  • a formula for calculating VRSLs for any VOC using VALs and attenuation factors.

Please note: Two look-up tables were previously provided on this page. These tables have been merged into one document in the December 2015 revision. The content of the two previous tables is preserved in this single revised version.

Using EPA's Vapor Intrusion Screening Level Calculator to Determine DNR VALs

The U.S. EPA Vapor Intrusion Screening Level Calculator (VISL) and VISL User Guide [exit DNR] can be used to calculate DNR VALs for compounds not listed in the Quick Look-up Table. The user can use the drop-down check box beside the chemical name (listed alphabetically) to adjust the compounds viewed on the worksheet. The user should adjust the default target risk to 1x10-5 and choose the risk scenario (residential or commercial). The calculator will then provide the target indoor concentrations for the carcinogenic and non-carcinogenic endpoints. The DNR VAL is equal to the lesser of the two values.


DNR webinar trainings

The Remediation and Redevelopment Program provides web and teleconference-based training sessions that cover a variety of technical and policy issues.  Visit the RR Program training library to access the presentations and find vapor intrusion related topics.

2014 Vapor Intrusion Outreach "Toolkit"

Anticipating the needs and concerns of affected property owners and the community at large is critically important whenever vapor intrusion is involved. Clear and effective communication with them should be one of the goals of any outreach plan. To help with those efforts, DNR created a comprehensive toolkit of vapor intrusion communication materials to increase the consistency and effectiveness of communications between responsible parties and the public.

2011 Vapor Intrusion Issues in Wisconsin - FET Webinars

In March 2011, staff from the RR Program participated in two Federation of Environmental Technologists (FET) webinars about vapor intrusion issues in Wisconsin. The agenda, PowerPoint presentation slides and videos of the presentations are available below.

PowerPoint slides
Video presentations

Other resources


Naval Facilities Engineering Command (NAVFAC)
American Petroleum Institute
Electric Power Reserach Institute (EPRI)


Interstate Technology & Regulatory Council (ITRC)
Strategic Environmental Research and Development Program (SERDP) and Environmental Security Technology Certification Program (ESTCP)



If you have general questions, contact either Alyssa Sellwood (608-266-3084) or a regional vapor intrusion expert from the table below.

For site specific questions please contact a DNR regional project manager. To determine which project manager you should contact, please see the RR Program's regional map [PDF].

Regional vapor intrusion experts
DNR Region Contact Person Telephone Number
Northern Phil Richard 715-762-1352
Northeast Jennifer Borski 920-424-7887
South Central Denise Nettesheim 608-275-3209
Southeast Nancy Ryan 414-263-8533
West Central Tom Hvizdak 715-421-7850
Last revised: Friday December 18 2015