POWER OF ATTORNEY

      KNOW  ALL  BY  THESE PRESENTS, that the undersigned hereby constitutes and
appoints  each  of Michael C. McCormick, Theodore D. Herzog, David F. Duvick and
Corinne   Lawson,   signing   singly,  as  the  undersigned's  true  and  lawful
attorney-in-fact to:

      (1)   prepare,  execute in the undersigned's name and on the undersigned's
            behalf,  and  submit  to the U.S. Securities and Exchange Commission
            (the  "SEC")  a Form ID, including amendments thereto, and any other
            documents  necessary  or  appropriate  to obtain codes and passwords
            enabling  the undersigned to make electronic filings with the SEC of
            reports  required by Section 16(a) of the Securities Exchange Act of
            1934 or any rule or regulation of the SEC;

      (2)   execute  for  and on behalf of the undersigned, in the undersigned's
            capacity   as  an  officer  and/or  director  of  Ecolab  Inc.  (the
            "Company"),  Forms  3,  4, and 5 in accordance with Section 16(a) of
            the  Securities  Exchange  Act  of 1934 and the rules thereunder and
            Form  144  in  accordance  with Rule 144 under the Securities Act of
            1933, and any other forms or reports the undersigned may be required
            to file in connection with the undersigned's ownership, acquisition,
            or disposition of securities of the Company;

      (3)   do and perform any and all acts for and on behalf of the undersigned
            which may be necessary or desirable to complete and execute any such
            Form  3,  4, 5 or 144, or other form or report; complete and execute
            any  amendment or amendments thereto; and timely file such form with
            the SEC and any stock exchange or similar authority; and

      (4)   take  any other action of any type whatsoever in connection with the
            foregoing  which, in the opinion of such attorney-in-fact, may be of
            benefit  to,  in  the  best interest of, or legally required by, the
            undersigned, it being understood that the documents executed by such
            attorney-in-fact on behalf of the undersigned pursuant to this Power
            of  Attorney  shall be in such form and shall contain such terms and
            conditions   as   such   attorney-in-fact   may   approve   in  such
            attorney-in-fact's discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and
authority  to  do  and perform any and every act and thing whatsoever requisite,
necessary,  or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could  do  if personally present, with full power of substitution or revocation,
hereby  ratifying  and  confirming  all  that  such  attorney-in-fact,  or  such
attorney-in-fact's  substitute  or substitutes, shall lawfully do or cause to be
done  by  virtue  of  this  power  of  attorney and the rights and powers herein
granted.  The  undersigned acknowledges that the foregoing attorneys-in-fact, in
serving  in  such  capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

      This  Power  of  Attorney  shall remain in full force and effect until the
undersigned  is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's  holdings of and transactions in securities issued by the Company,
unless  earlier  revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

      IN  WITNESS  WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of November 28, 2017.

                                         /s/ Timothy P. Mulhere
                                         ---------------------------------------
                                         Timothy P. Mulhere