EPA approved Wyoming's application to implement an underground injection control program for Class VI injection wells to protect underground sources of drinking water located within the state, except within Indian lands.

EPA proposed to approve revisions to Utah's public water system supervision program.

EPA tentatively approved revisions to the Navajo Nation’s public water system supervision program.

EPA announced its intention to approve revisions to Kentucky’s public water system supervision program.

EPA tentatively approved a revision to Ohio’s public water system supervision program.

EPA tentatively approved revisions to Wisconsin’s public water system supervision program.

EPA tentatively approved revisions to Illinois’ public water system supervision program.

EPA announced its intent to approve revisions to Massachusetts’, Connecticut’s, and New Hampshire’s public water system supervision programs.

EPA withdrew a 2011 determination to regulate perchlorate in accordance with the SDWA based on its determination that perchlorate does not occur "with a frequency and at levels of public health concern" within the meaning of the SDWA and based on the Administrator's judgment that regulation of perchlorate does not present a "meaningful opportunity for health risk reduction for persons served by public water systems."

EPA announced approval of Tennessee's request to revise its EPA-authorized program under the National Primary Drinking Water Regulations Implementation to allow electronic reporting.