Regional Screening Levels Archive

U.S. EPA's Regional Screening Levels show concentrations of toxic chemicals in various media (air, water, soil) that, if exceeded, might prompt additional investigation of a chemical release. The name "regional" derives from the fact that similar but differing versions of tables were originally published by three different EPA Regions (3, 6, and 9). At some point the regions consolidated their tables into what is in effect a national table, but the term "regional" remains for reasons I don't understand.

This is a large but incomplete archive of regional screening levels tables published by U.S. EPA, along with a few of the antecedent Region 3, 6, and 9 tables. Only the most recent are available on U.S. EPA's website; they remove the previous version when posting the latest. New versions appear sporadically so that, for example, no new tables appeared in 2025; other years generally see one or two updates, generally in the spring or fall, though sometimes a set of corrected tables appears. It can be very confusing. Anyway, what's posted here is for reference and historical purposes; make of it what you will.

Technical note: These tables use a hazard quotient of 1; I do have some versions that use a hazard quotient of 0.1 as preferred by some states and EPA risk assessors, and may post them if there seems to be any interest. Also: There is a lot of material here and I've likely messed up some of it. If you discover an issue, please let me know. Thanks.

2024 (November)

  Summary Table [pdf] [Excel]
  Residential Soil [pdf] [Excel]
  Commercial Soil [pdf] [Excel]
  Migration to Groundwater [pdf] [Excel]
  Residential Tap Water [pdf] [Excel]
  Residential Air [pdf] [Excel]
  Commercial Air [pdf] [Excel]
  Chemical Parameters [pdf] [Excel]
  Exposure Parameters [pdf] [Excel]
  Subchronic Toxicity Values [pdf] [Excel]
  User's Guide [pdf] [Word]

2024 (May)

  Summary Table [pdf] [Excel]   Residential Soil [pdf] [Excel]
  Commercial Soil [pdf] [Excel]
  Migration to Groundwater [pdf] [Excel]
  Residential Tap Water [pdf] [Excel]
  Residential Air [pdf] [Excel]
  Commercial Air [pdf] [Excel]
  Chemical Parameters [pdf] [Excel]

2023 (November)

2023 (May)

2022 (November)

2021 (November)

2020 (November)

2019 (November)

  Summary Table [pdf] [Excel]   Residential Soil [pdf] [Excel]
  Commercial Soil [pdf] [Excel]
  Residential Tap Water [pdf] [Excel]
  Residential Air [pdf] [Excel]
  Commercial Air [pdf] [Excel]
  Chemical Parameters [pdf] [Excel]

2018 (November)

2017 (November)

  Summary Table [pdf] [Excel]   Residential Soil [pdf] [Excel]
  Commercial Soil [pdf] [Excel]
  Migration to Groundwater [pdf] [Excel]
  Residential Tap Water [pdf] [Excel]
  Residential Air [pdf] [Excel]
  Commercial Air [pdf] [Excel]
  Chemical Parameters [pdf] [Excel]

2017 (June)

2016 (May)

2015 (November)

2015 (January)

  Summary Table [pdf] [Excel]   Residential Soil [pdf] [Excel]
  Commercial Soil [pdf] [Excel]
  Migration to Groundwater [pdf] [Excel]
  Residential Tap Water [pdf] [Excel]
  Residential Air [pdf] [Excel]
  Commercial Air [pdf] [Excel]
  Chemical Parameters [pdf] [Excel]

2014 (November)

  Summary Table [pdf] [Excel]   Residential Soil [pdf] [Excel]
  Commercial Soil [pdf] [Excel]
  Migration to Groundwater [pdf] [Excel]
  Residential Tap Water [pdf] [Excel]
  Residential Air [pdf] [Excel]
  Commercial Air [pdf] [Excel]
  Chemical Parameters [pdf] [Excel]

2014 (May)

2013 (November)

2013 (May)

2012 (November)

2012 (April)

2011 (November)

2011 (June)

2010 (November)

Summary Table [pdf]

Region 3 Tables

  2008 [pdf]
  2003 [pdf]
  2001 [pdf]
  1999 [pdf]

Region 6 Tables

  2008 [pdf]
  2003 [pdf]
  2002 [pdf]
  2000 [pdf]
  1999 [pdf]

Region 9 Tables

  2004 [pdf]
  2002 [pdf]
  2000 [pdf]

Thank you for visiting ecoindiana.net. I hope you found it useful.
Mike Habeck