An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Science Matters Articles related to Homeland Security Research

EPA scientists and engineers work collaboratively with Agency emergency response and field personnel, water utility professionals, and research partners from across the federal government and beyond to make the nation more secure, better prepared, and increasingly resilient to better respond to terrorist incidents and other catastrophes.