This page is being updated.
Thank you for your interest in this topic. We are currently updating our website to reflect EPA's priorities under the leadership of President Trump and Administrator Pruitt. If you're looking for an archived version of this page, you can find it on the January 19 snapshot.
Other ways to help you find what you are looking for:
- Use our advanced search page
- See our list of website topics
- Browse our A-Z index of terms and topics
- Search frequently asked questions or submit a question
- Search EPA Web Archive
- Browse EPA's snapshot website as of January 19, 2017
- Report a website issue
- Go to our home page
You can also search our site.