X0304 4 2011-12-13 0 0000031462 ECOLAB INC ECL 0001199342 SANDERS DANIEL S C/O ECOLAB INC. 370 WABASHA STREET N. ST. PAUL MN 55102 1 0 0 0 Common Stock 2011-12-13 4 P 0 5000 55.1886 A 46290 D The indicated purchase price of $55.1886 represents the weighted average purchase price for the range of prices paid of $55.1800 to $55.2099 per share. The reporting person undertakes to provide to Ecolab Inc., any security holder of Ecolab Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote. David F. Duvick, as Attorney-in-Fact for Daniel S. Sanders 2011-12-14