Exhibit 15.1
December 10, 2012
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
Commissioners:
We are aware that our reports dated May 3, 2012, August 2, 2012 and October 30, 2012 on our review of interim financial information of Ecolab Inc. for the three-month periods ended March 31, 2012 and 2011, for the three- and six-month periods ended June 30, 2012 and 2011 and for the three- and nine-month periods ended September 30, 2012 and 2011 and included in the Company’s quarterly reports on Form 10-Q for the quarters ended March 31, 2012, June 30, 2012 and September 30, 2012, respectively, are incorporated by reference in its Registration Statement on Form S-3 dated December 10, 2012.
Very truly yours,
/s/ PricewaterhouseCoopers LLP
Minneapolis, Minnesota