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EPA regularly promulgates updates to the table of approved Clean Water Act (CWA) monitoring methods at 40 CFR 136.3. The next routine Methods Update Rule (rMUR) is scheduled for proposal as early as fall 2022. For this routine MUR, EPA will only consider new methods or method revisions for which a complete, acceptable method package has been received by January 7, 2022. EPA will consider only methods submitted through the Alternate Test Procedure (ATP) program; from Voluntary Consensus Standard Bodies (VCSBs); and other government Agencies. EPA is not currently considering any changes to radiochemical or Whole Effluent Toxicity methods because of the extensive data requirements and review associated with these methods. EPA is not considering methods for new analytes in this routine MUR. More information on specific requirements for submission of method packages for new methods/revisions, see https://www.epa.gov/cwa-methods/alternate-test-procedures.