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Contact Superfund, Pacific Southwest

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Regional Screening Levels (Formerly PRGs)

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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.

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
Industrial Soil
Residential Air
Industrial Air
Residential Tapwaters
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NOTE: The 2004 version of the Region 9 PRG Table will remain at this web site in case users need to reference this historical document.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.

Information at this link provided for reference purposes only Region 9 PRGs 2004 Table (PDF) (16pp, 962 K)

Information at this link provided for reference purposes only User's Guide/Technical Background Document (PDF) (29pp, 284 K)

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