Table of Contents

Exhibit 99.1

Nalco Holding Company and Subsidiaries
Segment Information
2005 Results Reclassified to Conform with 2006 Presentation
(Unaudited)

(dollars in millions)				Three Months ended March 31, 2005				Three Months ended June 30, 2005				Three Months ended September 30, 2005				Three Months ended December 31, 2005				Year ended December 31, 2005
Industrial and Institutional Services				$	341.0			$	377.5			$	379.5			$	384.1			$	1,482.1
Energy Services					210.6				221.5				223.4				244.2				899.7
Paper Services					170.1				176.1				173.9				178.0				698.1
Other					55.9				61.2				58.1				57.3				232.5
Net Sales				$	777.6			$	836.3			$	834.9			$	863.6			$	3,312.4
Segment direct contribution:
Industrial and Institutional Services				$	65.5			$	82.9			$	87.5			$	86.6			$	322.5
Energy Services					43.0				39.7				42.8				47.5				173.0
Paper Services					30.1				27.4				30.8				29.7				118.0
Other					(5.2	)			(28.9	)			(14.2	)			(17.6	)			(65.9	)
Capital charge elimination					19.8				19.6				19.8				19.9				79.1
Total segment direct contribution					153.2				140.7				166.7				166.1				626.7
Expenses not allocated to segments:
Administrative expenses					46.5				47.6				42.0				40.1				176.2
Amortization of intangible assets					20.6				20.5				20.3				20.2				81.6
Business optimization expenses					0.8				17.0				3.5				4.3				25.6
Operating earnings (loss)					85.3				55.6				100.9				101.5				343.3
Other income (expense), net					(3.4	)			(0.1	)			(0.1	)			6.7				3.1
Interest income					2.1				2.0				2.1				2.2				8.4
Interest expense					(62.1	)			(64.8	)			(65.8	)			(65.3	)			(258.0	)
Earnings (loss) before income taxes and minority interests				$	21.9			$	(7.3	)		$	37.1			$	45.1			$	96.8