Region/Language Ecolab Investors Extranet Contact Search Expertise Sustainability Innovation About Nalco News & Events Careers North America United States Canada Nalco North America Home » About Nalco » Locations » North America North America Headquartered in Naperville, Illinois, Nalco is the leading provider of integrated water treatment and process improvement services, chemicals and equipment programs for industrial and institutional applications. Nalco currently has 3,000 sales professionals in North America servicing customers in all industries including paper, energy, manufacturing, mining, hospitality, healthcare, and food and beverage. Our customers include more than 70 per cent of the companies that comprise the Standard and Poors 500 index, as well as thousands of regional and local businesses. Headquarters 1601 West Diehl Rd. Naperville, IL 60563 Tel: +1-630-305-1000 Fax: +1-630-305-2900 COPYRIGHT © 2013 NALCO, AN ECOLAB COMPANY RSS | PRIVACY POLICY | LEGAL | SITEMAP | FEEDBACK