EPA approved revisions to Nevada's state primacy program that adopted the federal Filter Backwash Recycling Rule under the SDWA. 

EPA announced that Rhode Island and Massachusetts revised their respective public water system supervision programs. 

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

EPA announced its intention to approve revisions to Hawaii's public water system supervision program.

EPA announced its tentative approval of revisions to Wisconsin's public water system supervision program under the SDWA.

EPA announced the availability of and seeks comment on its draft of the Fifth Contaminant Candidate List, a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations but are known or anticipated to occur in public water systems and may require regulation under the SDWA.

EPA withdrew its primacy approval for Michigan's underground injection control Class II program after receiving adverse comments.

EPA approved alternative testing methods for use in measuring contaminants in drinking water to determine compliance with national primary drinking water regulations under the SDWA. 

EPA announced its intention to approve revisions to Nevada's public water system supervision program. 

EPA proposed to approve Michigan's underground injection control Class II program for primacy.