ECOLAB INC. — Director's Dealing 2005

Dec 10, 2005

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ECOLAB INC (ECL)
CIK: 0000031462
Period of Report: 2005-12-07

Reporting Person: LEWIS DIANA D (SVP - Human Resources)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2005-12-07	Employee Stock Option (Right to Buy)	$34.075	A	35300	Acquired	2015-12-07	Common Stock (35300)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	93490.704	Direct
Common Stock	11531.879	Indirect

Footnotes

F1: Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of Ocotober 31, 2005. Includes 23.375 UNITS acquired since the reporting person's last report. (The 11,531.879 UNITS are the equivalent of approximtely 20,840.137 shares of the issuer's Common Stock.)

F2: 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; provided, however, that if a Change in Control (as that term is defined in the 2005 Ecolab Inc. Stock Incentive Plan) will occur, then the option, if it has been outstanding for at least six months from the date of grant, will become immediately exercisable in full.