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Exhibit 21.1

SUBSIDIARIES OF DT MIDSTREAM, INC.

DT Midstream’s principal subsidiaries as of December 31, 2024 are listed below. All other subsidiaries, if considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary.

Subsidiary									State of Incorporation
1			Bluestone Pipeline Company of Pennsylvania, LLC						Pennsylvania
2			DTM Appalachia Gathering, LLC						Delaware
3			DTM LEAP Gas Gathering, LLC						Delaware
4			DTM Louisiana Gathering, LLC						Delaware
5			DTM Millennium Company						Michigan
6			DTM Nexus, LLC						Delaware
7			DTM Vector Company						Michigan
8			Guardian Pipeline, LLC						Delaware
9			Midwestern Gas Transmission Company						Delaware
10			Stonewall Gas Gathering LLC						Delaware
11			Stonewall Gas Holdings, LLC						Delaware
12			Susquehanna Gathering Company I, LLC						Pennsylvania
13			Viking Gas Transmission Company						Delaware