Exhibit 99.1 NEWS RELEASE DT Midstream Reports Strong Second Quarter 2026 Results DETROIT, July 30, 2026 – DT Midstream, Inc. (NYSE: DTM) today announced second quarter 2026 reported net income of $112 million, or $1.09 per diluted share and Operating Earnings of $112 million, or $1.09 per diluted share. Adjusted EBITDA for the quarter was $305 million. Reconciliations of Operating Earnings and Adjusted EBITDA (non-GAAP measures) to reported net income are included at the end of this news release. The compa ...