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EPA's Region 6 Office

Serving: Arkansas, Louisiana, New Mexico, Oklahoma, Texas, and 66 Tribal Nations

Regional Screening Levels

(Formerly HHMSSL - Human Health Medium-Specific Screening Levels)

Welcome to the Region 6 Regional Screening Level (RSL) website.  The downloadable tables were developed jointly with DOE's Oak Ridge National Laboratory (ORNL) under an Interagency Agreement as an update of the EPA Region 3 RBC Table, Region 6 HHMSSL Table and the Region 9 PRG Table.  Regions 3, 6, and 9 have historically published screening values on the internet and worked together to develop a consensus based approach to developing a screening table. In addition to the updated RSL tables, a Screening Level Calculator is included to assist in calculating site-specific screening levels.   Please check with your program before using the calculator to determine its appropriateness for your situation and/or site.

The tables were not generated to represent action levels or cleanup levels but rather as technical tools. The responsibility of their use and relevance to site-specific circumstances becomes the responsibility of the person recommending their use and the user of the table. To ensure proper use of the RSL tables and the Screening Level Calculator, please review the User's Guide, Equations, What's New and Frequently Asked Questions (FAQs) .

You will need the free Adobe Reader to view some of the files on this page.
See EPA's PDF page to learn more.

Traditional Tables
TR=1E-06 and THQ=1.0

New Tables
TR=1E-06 and THQ=0.1

(TR=1E-06 THQ=1.0)
(TR=1E-06 THQ=1.0)
(TR=1E-06 THQ=0.1)
(TR=1E-06 THQ=0.1)
Summary Table
Residential Soil Supporting
Industrial Soil Supporting
Residential Air Supporting
Industrial Air Supporting
Residential Tapwater Supporting
Residential Soil to Groundwater
Chemical-specific Parameters
Composite Table

For assistance/questions on RSLs, please use the contact us page.

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