Cassatt Water was originally incorporated on November 18, 1969 as a not-for-profit water company for the purpose of acquiring, constructing, maintaining and providing a water distribution system and supplying water to individuals, farms, businesses, corporations and political subdivisions within its service area. At the time of its initial operation, the Water Company served approximately 500 customers in the rural Cassatt and Sandy Run communities of Kershaw County. In 1975, Kershaw County, Lee County and the Water Company entered into an Agreement for Establishment of Rural Water Service in Portions of Kershaw and Lee County. Since 1975, the Water Company continued to expand its service area to include service to portions of Kershaw, Lee, Sumter & Lancaster County.
The current service area includes an area of approximately 764 square miles and provides water service to approximately 24,300 people. The Authority is governed by a nine-member Board of Commissioners.