EX-21.1
Published on February 23, 2022
Exhibit 21.1
Subsidiaries of Select Energy Services, Inc.
| Entity | 
 | State of Formation | 
| Select Agua Libre Midstream, LLC |  | Delaware | 
| Complete Energy Services, LLC |  | Delaware | 
| SES Holdings, LLC | 
 | Delaware | 
| Select Energy Services, LLC | 
 | Delaware | 
| Peak Oilfield Services, LLC | 
 | Texas | 
| Rockwater Energy Solutions, LLC | 
 | Delaware | 
| Tidal Logistics, Inc. |  | Texas |