Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Compass Minerals International, Inc. 2020 Incentive Award Plan, of our report dated November 29, 2023 (except for the effects of the restatement discussed in Note 1 and Note 23, as to which the date is October 29, 2024), with respect to the consolidated financial statements and schedule of Compass Minerals International, Inc. and our report dated November 29, 2023, (except for the effects of the material weaknesses described in the third paragraph therein, as to which the date is October 29, 2024) with respect to the effectiveness of internal control over financial reporting of Compass Minerals International, Inc. included in its (Form 10-K/A) for the year ended September 30, 2023, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Kansas City, Missouri

November 13, 2024