Eastern Water and Sanitation Company Limited (EWSC) was incorporated on 12th May 2008 under the Companies Act CAP 388 of the laws of Zambia to provide water supply and sanitation services to the urban and peri-urban population in Eastern Province. The company commenced operations effectively on 20th January 2009. EWSC is wholly owned by the eight (08) local authorities in the province holding shares on pro-rata basis.The company has been licensed by the National Water Supply and Sanitation Council (NWASCO) as the Regulator.

The company operates under the provision of the water and sanitation act No 28 of November 1997. The act enables the company to operate on a commercial and viable basis. The company is wholly owned by the eight local authorities in Eastern Province and one local auathority in Muchinga province holding shares on pro-rata basis.