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Ecolab (ECL)

Filed: 29 Oct 21, 8:27am

Exhibit (32.1)

Section 1350 Certifications

Pursuant to 18 U.S.C. Section 1350, each of the undersigned officers of Ecolab Inc. does hereby certify that:

(a)the Quarterly Report on Form 10-Q of Ecolab Inc. for the quarter ended September 30, 2021 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b)information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Ecolab Inc.

Dated: October 29, 2021

/s/ Christophe Beck

Christophe Beck

President and Chief Executive Officer

Dated: October 29, 2021

/s/ Daniel J. Schmechel

Daniel J. Schmechel

Chief Financial Officer