5 Biggest Water Treatment Companies in the World

4. Nalco Water

Nalco Water is the Daughter Company of Ecolab (NYSE: ECL). It is based in Illinois and is a supplier of water, energy and air improvement solutions and services for the industrial and the institutional markets. Founded in 1928, Nalco Water is headquartered in Naperville, Illinois, United States. It was formed from the merger of Chicago Chemical Company and the Aluminum Sales Corporation and was originally named the National Aluminate Corporation. Ecolab acquired it in the December of 2011. It serves approximately 70,000 customers over 130 countries.

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