Exhibit 99.1

Nalco Holding Company and SubsidiariesSegment Information2006 Results Reclassified to Conform with 2007 Presentation(Unaudited)

|                                                     |  |  |                                     |   |        |                                    |  |  |                                         |   |        |                                        |  |  |                                 |   |        |         |  |  |  |   |        |         |  |  |  |   |         |         |
|-----------------------------------------------------|--|--|-------------------------------------|---|--------|------------------------------------|--|--|-----------------------------------------|---|--------|----------------------------------------|--|--|---------------------------------|---|--------|---------|--|--|--|---|--------|---------|--|--|--|---|---------|---------|
| (dollars in millions)                               |  |  | Three MonthsendedMarch 31,2006 |   |        | Three MonthsendedJune 30,2006 |  |  | Three MonthsendedSeptember 30,2006 |   |        | Three MonthsendedDecember 31,2006 |  |  | YearendedDecember 31, 2006 |
| Industrial and Institutional Services               |  |  |                                     | $ | 381.5  |                                    |  |  |                                         | $ | 392.4  |                                        |  |  |                                 | $ | 409.4  |         |  |  |  | $ | 421.8  |         |  |  |  | $ | 1,605.1 |         |
| Energy Services                                     |  |  |                                     |   | 246.6  |                                    |  |  |                                         |   | 259.5  |                                        |  |  |                                 |   | 267.3  |         |  |  |  |   | 279.8  |         |  |  |  |   | 1,053.2 |         |
| Paper Services                                      |  |  |                                     |   | 176.1  |                                    |  |  |                                         |   | 178.4  |                                        |  |  |                                 |   | 181.5  |         |  |  |  |   | 186.9  |         |  |  |  |   | 722.9   |         |
| Other                                               |  |  |                                     |   | 45.2   |                                    |  |  |                                         |   | 60.7   |                                        |  |  |                                 |   | 57.2   |         |  |  |  |   | 58.3   |         |  |  |  |   | 221.4   |         |
| Net Sales                                           |  |  |                                     | $ | 849.4  |                                    |  |  |                                         | $ | 891.0  |                                        |  |  |                                 | $ | 915.4  |         |  |  |  | $ | 946.8  |         |  |  |  | $ | 3,602.6 |         |
| Segment direct contribution:                        |  |  |                                     |   |   |                                    |  |  |                                         |   |   |                                        |  |  |                                 |   |   |         |  |  |  |   |   |         |  |  |  |   |    |         |
| Industrial and Institutional Services               |  |  |                                     | $ | 80.1   |                                    |  |  |                                         | $ | 85.0   |                                        |  |  |                                 | $ | 98.2   |         |  |  |  | $ | 97.3   |         |  |  |  | $ | 360.6   |         |
| Energy Services                                     |  |  |                                     |   | 48.6   |                                    |  |  |                                         |   | 55.3   |                                        |  |  |                                 |   | 58.3   |         |  |  |  |   | 63.0   |         |  |  |  |   | 225.2   |         |
| Paper Services                                      |  |  |                                     |   | 26.4   |                                    |  |  |                                         |   | 26.8   |                                        |  |  |                                 |   | 29.0   |         |  |  |  |   | 33.0   |         |  |  |  |   | 115.2   |         |
| Other                                               |  |  |                                     |   | (20.0  | )                             |  |  |                                         |   | (15.2  | )                                 |  |  |                                 |   | (15.1  | )  |  |  |  |   | (5.8   | )  |  |  |  |   | (56.1   | )  |
| Capital charge elimination                          |  |  |                                     |   | 19.2   |                                    |  |  |                                         |   | 18.9   |                                        |  |  |                                 |   | 19.4   |         |  |  |  |   | 19.6   |         |  |  |  |   | 77.1    |         |
| Total segment direct contribution                   |  |  |                                     |   | 154.3  |                                    |  |  |                                         |   | 170.8  |                                        |  |  |                                 |   | 189.8  |         |  |  |  |   | 207.1  |         |  |  |  |   | 722.0   |         |
| Expenses not allocated to segments:                 |  |  |                                     |   |   |                                    |  |  |                                         |   |   |                                        |  |  |                                 |   |   |         |  |  |  |   |   |         |  |  |  |   |    |         |
| Administrative expenses                             |  |  |                                     |   | 51.4   |                                    |  |  |                                         |   | 46.1   |                                        |  |  |                                 |   | 54.2   |         |  |  |  |   | 57.7   |         |  |  |  |   | 209.4   |         |
| Amortization of intangible assets                   |  |  |                                     |   | 17.3   |                                    |  |  |                                         |   | 17.5   |                                        |  |  |                                 |   | 17.6   |         |  |  |  |   | 17.7   |         |  |  |  |   | 70.1    |         |
| Business optimization expenses                      |  |  |                                     |   | 3.8    |                                    |  |  |                                         |   | 1.8    |                                        |  |  |                                 |   | 3.0    |         |  |  |  |   | 0.9    |         |  |  |  |   | 9.5     |         |
| Operating earnings                                  |  |  |                                     |   | 81.8   |                                    |  |  |                                         |   | 105.4  |                                        |  |  |                                 |   | 115.0  |         |  |  |  |   | 130.8  |         |  |  |  |   | 433.0   |         |
| Other income (expense), net                         |  |  |                                     |   | 1.2    |                                    |  |  |                                         |   | (1.9   | )                                 |  |  |                                 |   | 0.1    |         |  |  |  |   | (3.8   | )  |  |  |  |   | (4.4    | )  |
| Interest income                                     |  |  |                                     |   | 1.7    |                                    |  |  |                                         |   | 2.3    |                                        |  |  |                                 |   | 2.4    |         |  |  |  |   | 2.7    |         |  |  |  |   | 9.1     |         |
| Interest expense                                    |  |  |                                     |   | (66.3  | )                             |  |  |                                         |   | (68.1  | )                                 |  |  |                                 |   | (68.9  | )  |  |  |  |   | (68.7  | )  |  |  |  |   | (272.0  | )  |
| Earnings before income taxes and minority interests |  |  |                                     | $ | 18.4   |                                    |  |  |                                         | $ | 37.7   |                                        |  |  |                                 | $ | 48.6   |         |  |  |  | $ | 61.0   |         |  |  |  | $ | 165.7   |         |
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