Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
Regional Screening Levels (Formerly PRGs)
Regional Screening Level Resources
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Screening Levels for Chemical Contaminants
The Region 9 PRGs have been harmonized with similar risk-based screening levels used by Regions 3 and 6 into a single table: "Regional Screening Levels (RSL) for Chemical Contaminants at Superfund Sites." These updated screening levels, along with a detailed user's guide and supplementary tables, can be accessed directly on-line or downloaded to your own computer. In addition, the web site contains a Screening Level Calculator to assist in calculating site-specific screening levels.
RSL Tables (Last updated November 2013)
The screening level (RSL) tables are available for download in Excel and PDF formats. These tables are considered ready for use. The tables contain both RSL calculations and the toxicity values that were used. For additional information please see the resources box at the the upper-right of this page.
TR=1E-06 and THQ=1.0
TR=1E-06 and THQ=0.1
|Residential Soil to Groundwater|
|Chemical Specific Parameters|
|Composite Table (Every Table)|
NOTE: The 2004 version of the Region 9 PRG Table will remain at this web site in case users need to reference this historical document. However, the 2004 Table should no longer be used for contaminant screening of environmental media because it has been replaced with the more current Table above.
Region 9 PRGs 2004 Table (PDF) (16pp, 962 K)
User's Guide/Technical Background Document (PDF) (29pp, 284 K)
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