Nalco Announces Date for Second-Quarter Financial Results and Conference Call/Webcast

Nalco (NYSE:NLC), providing essential expertise for water, energy and air, announced today it will release its second-quarter 2010 financial results after market close on July 27.

At 10 a.m. ET on July 28, the Company will hold a conference call and live audio-only Webcast led by Nalco Chairman and Chief Executive Officer J. Erik Fyrwald and other senior management team members to discuss these results.

Date: 7/28/2010

Start Time: 10 a.m. ET / 9 a.m. CT / 8 a.m. MT / 7 a.m. PT

Length: 60 minutes

Dial-in Telephone Number: 1- 913-312-0857

Confirmation Code: 4785400

To help ensure the conference call begins in a timely manner, please dial in five to 10 minutes prior to the scheduled start time on July 28.

The audio-only Webcast will be available through the Investor Relations section of Nalco’s Web site, www.nalco.com/investors. Following the live event, an archived version of the Webcast will also be available on the Nalco Web site under Investor Relations, Events/Presentations.

About Nalco

Nalco is the world’s leading water treatment and process improvement company, delivering significant environmental, social and economic performance benefits to our customers. We help our customers reduce energy, water and other natural resource consumption, enhance air quality, minimize environmental releases and improve productivity and end products while boosting the bottom line. Together our comprehensive solutions contribute to the sustainable development of customer operations. Nalco is a member of the Dow Jones Sustainability World Index. More than 11,500 Nalco employees operate in 150 countries supported by a comprehensive network of manufacturing facilities, sales offices and research centers to serve a broad range of end markets. In 2009, Nalco achieved sales of more than $3.7 billion. For more information visit www.nalco.com.

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