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Exhibit 21.1

SUBSIDIARIES OF DT MIDSTREAM, INC.

DT Midstream’s principal subsidiaries as of December 31, 2025 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 Interstate Transportation, LLC						Delaware
4			DTM LEAP Gas Gathering, LLC						Delaware
5			DTM Louisiana Gathering, LLC						Delaware
6			DTM Millennium Company						Michigan
7			DTM Nexus, LLC						Delaware
8			DTM Vector Company						Michigan
9			Guardian Pipeline, LLC						Delaware
10			Midwestern Gas Transmission Company						Delaware
11			Stonewall Gas Gathering LLC						Delaware
12			Stonewall Gas Holdings, LLC						Delaware
13			Susquehanna Gathering Company I, LLC						Pennsylvania
14			Viking Gas Transmission Company						Delaware