Exhibit 21

Subsidiaries of Energy Services of American Corporation

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Name	​ ​ ​	State of Incorporation
​	​	​
West Virginia Pipeline, Inc.	​	West Virginia (direct)
​	​	​
SQP Construction Group, Inc.	​	West Virginia (direct)
​	​	​
Tri-State Paving & Sealcoating, Inc.	​	West Virginia (direct)
​	​	​
Ryan Construction Services, Inc.	​	West Virginia (direct)
​	​	​
Tribute Acquisition Company, Inc.	​	Ohio (direct)
​	​	​
C.J. Hughes Construction Company, Inc.	​	West Virginia (direct)
​	​	​
Contractors Rental Company, Inc. (1)	​	West Virginia (indirect)
​	​	​
Nitro Construction Service, Inc. (1)	​	West Virginia (indirect)
​	​	​
Nitro Electric Company, LLC (2)	​	Michigan (indirect)
​	​	​
Pinnacle Technical Solutions, Inc. (2)	​	West Virginia (indirect)

(1) Subsidiary of C.J. Hughes Construction Company, Inc.

(2) Subsidiary of Nitro Construction Services, Inc.