An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Programs of the Office of the Science Advisor (OSA)

Strengthening Transparency in Regulatory Science

A Proposed Rule by the Environmental Protection Agency on 04/30/2018

This action provides that EPA will ensure that the regulatory science underlying its actions is publicly available in a manner sufficient for independent validation. Where available and appropriate, EPA will use peer-reviewed information, standardized test methods, consistent data evaluation procedures, and good laboratory practices to ensure transparent, understandable, and reproducible scientific assessments. This action is consistent with the principles underlying the Administrative Procedure Act and programmatic statutes that EPA administers to disclose to the public the bases for agency rules and to rationally execute and adequately explain agency actions. This action is also consistent with Executive Orders 13777 and 13783, and the focus on transparency in OMB’s Guidelines for Ensuring and Maximizing the Quality, Objectivity, Utility and Integrity of Information Disseminated by Federal Agencies (the Guidelines) and OMB Memorandum 13-13: Open Data Policy – Managing Information as an Asset. It builds upon prior EPA actions in response to government-wide data access and sharing policies, as well as the experience of other federal agencies in this space.

The EPA is extending the comment period on the proposed rule, which was scheduled to close on May 30, 2018, until August 16, 2018. The EPA is also announcing a public hearing to be held for the proposed rule. The hearing will be held on July 17, 2018 in Washington, DC.  The EPA is making these changes in response to public requests for an extension of the comment period and for a public hearing. ​

Online registration for the public hearing closed on July 16, 2018.

Final Federal Register Notice: Strengthening Transparency in Regulatory Science-- Extension of Comment Period and Notice of Public Hearing

EPA is providing a listen-only phone line and listen-only webinar for members of the public who would like to join the hearing remotely. Please be aware that access to the listen-only phone line and Adobe Connect participant slots will be granted on a first-come, first-served basis. The conference phone line will be available at call-in number: 866-299-3188, code: 202-564-6854. The listen-only webinar will be available at

Only participants that physically attend the hearing will have the opportunity to provide oral comments. To submit written comments to the docket, please visit Docket ID No. EPA-HQ-OA-2018-0259. Public comments must be submitted on or before August 16, 2018.

Attached below is a PDF list of those registered to speak at the public hearing. The speakers are listed by session but are not listed in speaker order within each session. Speaker order will be determined by check-in time.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.