Exhibit 21.1
SUMMIT MIDSTREAM PARTNERS, LP
LIST OF SUBSIDIARIES
| Name | State or other jurisdiction of incorporation or organization | |
| DFW Midstream Services LLC | Delaware | |
| Centennial Water Pipelines LLC | Delaware | |
| Double E Pipeline, LLC | Delaware | |
| Epping Transmission Company, LLC | Delaware | |
| Grand River Gathering, LLC | Delaware | |
| Grasslands Energy Marketing LLC | Delaware | |
| Meadowlark Midstream Company, LLC | Delaware | |
| Polar Midstream, LLC | Delaware | |
| Red Rock Gathering Company, LLC | Delaware | |
| Summit Climate Solutions, LLC | Delaware | |
| Summit Contribution Holdings, LLC | Delaware | |
| Summit DJ-O Operating, LLC | Delaware | |
| Summit DJ-O, LLC | Delaware | |
| Summit DJ-S Pipeline Company | Delaware | |
| Summit DJ-S, LLC | Delaware | |
| Summit Management Holdings, LLC | Delaware | |
| Summit Midstream Finance Corp. | Delaware | |
| Summit Midstream GP, LLC | Delaware | |
| Summit Midstream Holdings, LLC | Delaware | |
| Summit Midstream Marketing, LLC | Delaware | |
| Summit Midstream Niobrara, LLC | Delaware | |
| Summit Midstream OpCo, LP | Delaware | |
| Summit Midstream Partners Holdings, LLC | Delaware | |
| Summit Midstream Partners, LLC | Delaware | |
| Summit Midstream Permian II, LLC | Delaware | |
| Summit Operating Services Company, LLC | Delaware | |
| Summit Permian Transmission Holdco, LLC | Delaware | |
| Summit Permian Transmission, LLC | Delaware |