An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Proposed Technical Revisions and Clarifications to National Emission Standards for Hazardous Air Pollutants: Municipal Solid Waste Landfills Residual Risk and Technology Review

On January 11, 2021, the US. Environmental Protection Agency (EPA) proposed technical revisions and clarifications to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Municipal Solid Waste (MSW) Landfills established in the March 26, 2020, final rule. In this action, EPA is proposing technical revisions and clarifications. These changes correct inadvertent errors and clarify:

  • Wellhead monitoring requirements for the purpose of identifying excess air infiltration
  • Delegation of authority to state, local or tribal agencies for “emission standards”
  • Applicability of the General Provisions to affected MSW landfills 
  • Handling of monitoring data for combustion devices during periods of monitoring system breakdowns, repairs, calibration checks and adjustments.

You can download a pre-publication version and a summary fact sheet for the proposed technical correction below.

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