This action is in response to seven petitions for reconsideration by industry and environmental stakeholders of the agency’s promulgated Standards of Performance for Municipal Solid Waste Landfills and its companion rule, Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills. The EPA finalized these two rules on August 29, 2016 (81 FR 59332 and 81 FR 59276). The petitions raised at least one objection to the rule requirements included in the final rule that arose after the comment period or was impracticable to raise during the comment period and that is of central relevance to the rule. In a letter signed May 5, 2017, the Administrator granted reconsideration of six specific issues in a petition from industry representatives: (1) tier 4 surface emission monitoring; (2) annual liquids reporting; (3) corrective action timeline procedures; (4) overlapping applicability with other rules; (5) the definition of cover penetration; and (6) design plan approval, as well as any other matter that will benefit from additional comment. This action proposes the EPA’s response to the issues for which the EPA granted reconsideration.