Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statement (No. 333-121965) on Form S-8 of our report dated June 29, 2026, with respect to the financial statements of Compass Minerals International, Inc. 401(k) Savings Plan.

/s/ KPMG LLP

Houston, Texas

June 29, 2026