The EPA Administrator, Andrew Wheeler, signed the following proposed rule on 1/14/2021, and EPA is submitting it for publication in the Federal Register (FR). While we have taken steps to ensure the accuracy of this Internet version of the proposed rule, it is not the official version of the proposed rule. Please refer to the official version in a forthcoming FR publication, which will appear on the Government Printing Office’s FDsys website (https:// www.gpo.gov/fdsys/). It will also appear on Regulations.gov (https://www.regulations.gov/) in Docket No. EPAHQ-OW-2020-0530. Once the official version of this document is published in the FR, this version will be removed from the Internet and replaced with a link to the official version.

• Pre-publication: Proposed – Revisions to the UCMR 5 for Public Water Systems and Announcement of a Public Meeting (PDF)(93 pp, 5 MB)