EXHIBIT 21.1

LIST OF SUBSIDIARIES

Western Midstream Partners, LP

Western Midstream Operating, LP

As of December 31, 2021

Subsidiaries of Western Midstream Partners, LP

Western Midstream Operating GP, LLC, a Delaware limited liability company

Western Midstream Services, LLC, a Delaware limited liability company

Western Midstream Services Holdings, LLC, a Delaware limited liability company

Western Midstream Operating, LP, a Delaware limited partnership

Subsidiaries of Western Midstream Operating, LP

Anadarko DJ Gas Processing LLC, a Delaware limited liability company

Anadarko DJ Oil Pipeline LLC, a Delaware limited liability company

Anadarko Gathering Company LLC, a Delaware limited liability company

Anadarko Mi Vida LLC, a Delaware limited liability company

Anadarko Pecos Midstream LLC, a Delaware limited liability company

Anadarko Wattenberg Company, LLC, a Delaware limited liability company

Anadarko Wattenberg Oil Complex LLC, a Delaware limited liability company

APC Water Holdings 1, LLC, a Delaware limited liability company

Chipeta Processing LLC, a Delaware limited liability company

DBM Crude Services, LLC, a Delaware limited liability company

DBM Oil Services, LLC, a Delaware limited liability company

DBM Pipeline, LLC, a Delaware limited liability company

DBM Water Services, LLC, a Delaware limited liability company

Western Midstream Marketing LLC, a Delaware limited liability company

Delaware Basin JV Gathering LLC, a Delaware limited liability company

Delaware Basin Midstream, LLC, a Delaware limited liability company

GNB NGL Pipeline LLC, a Delaware limited liability company

Kerr-McGee Gathering LLC, a Colorado limited liability company

MIGC LLC, a Delaware limited liability company

Mountain Gas Resources LLC, a Delaware limited liability company

Mountain Gas Transportation LLC, a Delaware limited liability company

Overland Trail Transmission, LLC, a Delaware limited liability company

Springfield Pipeline LLC, a Texas limited liability company

Wamsutter Pipeline LLC, a Delaware limited liability company

Western Gas Operating, LLC, a Delaware limited liability company

Western Gas Wyoming, L.L.C., a Wyoming limited liability company

WGR Operating, LP, a Delaware limited partnership