X0306 4 2012-12-05 0 0000031462 ECOLAB INC ECL 0001431849 Corkrean John J 370 WABASHA STREET N SAINT PAUL MN 55102 0 1 0 0 Sr.VP and Corporate Controller Common Stock 9785 D Common Stock 1598.512 I By Ecolab Savings Plan Employee Stock Option (Right to Buy) 71.54 2012-12-05 4 A 0 9800 0.00 A 2013-12-05 2022-12-05 Common Stock 9800 9800 D Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of November 30, 2012. Includes 5.437 UNITS acquired since the reporting person's last report. (The 1,598.512 UNITS are the equivalent of approximtely 2,969 shares of the issuer's Common Stock.) The option will be exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. David F. Duvick, as Attorney-In-Fact for John J. Corkrean 2012-12-07