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Vulnerable Zone Determination

Vulnerable zones are areas that could be affected by a release from a chemical accident at a facility subject to the risk management program requirements in 40 CFR Part 68. How can one determine if they live or work within a vulnerable zone?

The Vulnerable Zone Indicator System (VZIS) allows citizens to quickly find out if an address of interest could be affected by a chemical accident at facility that has submitted a risk management plan (RMP).

VZIS is available at the following URL:

The VZIS is also available by contacting the RMP Reporting Center at 703-227-7650 or

Citizens should also work with their local emergency planning committees (LEPCs) to learn more about chemicals in their community. LEPCs develop comprehensive emergency response plans and also receive chemical inventory reports from facilities in the community.