ECOLAB INC. — Director's Dealing 2011

May 31, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ECOLAB INC (ECL)
CIK: 0000031462
Period of Report: 2011-05-27

Reporting Person: BILLER LESLIE S (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-27	Common Stock	M	5003	$24.895	Acquired	77735.74	Direct
2011-05-27	Common Stock	F	2324	$53.575	Disposed	75411.74	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-27	Stock Option (Right to Buy)	$24.895	M	5003	Disposed	2011-11-01	Common Stock (5003)	Direct

Footnotes

F1: Reflects the reporting person's payment of the exercise price and withholding taxes for a stock option issued in accordance with Rule 16b-3 by withholding shares of Ecolab Common Stock.