Skip to Search
Skip to Main Content
Main Content


News & Publications


Godfrey & Kahn Updates


Press Room


New Homeland Security Regulations May Require G&K Clients to Submit a 'Top Screen' Assessment of Chemicals Present at Their Facilities Early This Fall

July 06, 2007

New regulations released by the Department of Homeland Security (DHS) will require any facility that possesses any chemicals determined by the department to be “chemicals of interest,” in a quantity at or above a “screened threshold quantity” (SQT), to submit an assessment referred to in the regulations as a “top screen.” This requirement is likely to apply to a broad spectrum of facilities, including facilities that do not consider themselves to be “chemical facilities,” much less to be “high-risk chemical facilities.” Therefore, Godfrey & Kahn clients are advised to carefully determine whether they are required to submit a top screen analysis in accordance with these new regulations.

Top Screen Requirement Applies to a Broad Spectrum of Facilities
A list of chemicals of interest and an SQT for each chemical is provided in Appendix A to the new regulations. Appendix A currently includes more than 300 chemicals of interest. Further, many of these chemicals have a very low SQT. For example, possessing nitrous oxide or phosphorous in “any amount” triggers the top screen requirement. With such low thresholds for such a wide variety of chemicals, it is likely that many facilities will be required to submit a top screen assessment. Accordingly, DHS is in the process of developing a web-based tool referred to as the Chemical Security Assessment Tool (CSAT) for collecting top screen assessments and other reporting requirements of the new regulation.

In order to complete the top screen assessment, facilities will first be required to register to use CSAT, designate facility personnel to prepare, submit, and authorize the top screen and provide general information about the facility such as location, type, owner/operator, and number of employees. The top screen assessment consists of questions regarding the types and quantities of chemicals on the facility site, questions about risk potential and economic loss, locations of chemical storage areas including the main storage area (area of highest quantity), topography of the facility (urban or rural), and full production capacity. CSAT will provide on-screen help, answers to frequently asked questions, and a helpdesk.

According to the regulations, facilities are to complete the top screen within 60 days of the adoption of Appendix A, which is expected to be finalized in early July 2007. Detailed directions for accessing CSAT and completing the top screen are available on the DHS website.

Top Screen Is the First Phase of Comprehensive Security Regulations
The top screen assessment is only the first phase of the comprehensive security requirements imposed on high-risk chemical facilities under the new regulations. The purpose of the top screen assessment is to determine whether a facility is a high-risk chemical facility. Facilities that are determined by DHS to be high-risk chemical facilities will then be required to complete and submit a security vulnerability assessment (SVA). As part of the SVA, high-risk chemical facilities must identify security threats and conduct a risk assessment particular to that facility and identify potential countermeasures. The requirements for the SVA are set forth in the regulations and all SVAs are subject to DHS approval.

Based on the SVA, DHS will assign the facility to one of four risk-based tiers. The specific factors upon which DHS will base this decision are considered to be sensitive, anti-terrorism information, and will not be made available to the public.

Once a high-risk facility has been assigned a risk tier, the facility must develop and implement a site security plan. The site security plan must address all of the vulnerabilities identified in the SVA. In addition, DHS will promulgate risk-based performance standards for each risk tier. Each facility’s site security plan must address the performance standards for the applicable risk tier. Site security plans are subject to DHS approval, which is based on an inspection and audit of the facility by the DHS.

G&K Clients Should Identify and Quantify Chemicals of Interest at Their Facilities
DHS is developing guidance materials for the implementation of much of the new regulations, including performance standards for each risk tier. In the meantime, it is important for facilities to determine whether they are required to conduct a top screen assessment by identifying any chemicals of interest in quantities above the SQT for that chemical. Considering the low threshold for many of these chemicals and the spectrum of chemicals included in Appendix A, all facilities should investigate their chemical inventory, even if they would not consider themselves a high-risk chemical facility.

Please contact Kevin Boyle (414-287-9428 or or Arthur Harrington (414-287-9414 or if you would like to learn more about these requirements.

Related Attorneys

Please wait while we gather your results.


Get practical insights on COVID-19 legal issues for your business.

Visit Resource Center

Media Contact 

If you have a media request or need an attorney with particular knowledge for comment, please contact Kyle Mondy, Marketing & Communications Manager, at 414.287.9481 or


Subscribe today to receive firm newsletters and blogs, client updates, seminar announcements, and more according to your preferences and areas of interest.


For more information on this topic, or to learn how Godfrey & Kahn can help, contact our COVID-19 Response Team.

Disclaimer and Legal Notices

Copyright © 2020 Godfrey & Kahn, S.C.

Attorneys at Law - All rights reserved.


Client Login