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Exhibit 16.1

July 10, 2026

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We have read the statements made by Natural Gas Services Group, Inc. included under Item 4.01 of its Current Report on Form 8-K dated July 9, 2026 to be filed with the Securities and Exchange Commission. We agree with the statements concerning our Firm contained therein.

Sincerely,

/s/ Ham, Langston & Brezina, L.L.P.