 In July 2011, Nalco Water announced a merger with Ecolab, Inc., and it became a wholly owned subsidiary of Ecolab Inc. in December 2011 after the completion of the US$5.4 billion acquisition by Ecolab.In 1994, Nalco Water and Exxon Chemical Company announced the formation of the joint venture, Nalco Exxon Energy Chemicals L.P., to provide products and services to all facets of the petroleum and natural gas industries.In 2001, NALCO, which by then named 'Ondeo Nalco', strengthened its position in the petroleum industry when Nalco Exxon Energy Chemicals, L.P. became part of the company through redemption of ExxonMobil stock in the joint venture.