The Catawba River Water Supply Project is a Joint Venture wholly owned and operated by the two joint ventures, Lancaster County Water & Sewer District in South Carolina and Union County in North Carolina.
In 1991 the two joint ventures determined that, by joining together to construct a new water treatment plant for their mutual benefit, rather than each separately constructing its own new water plant, certain economies of scale and a long term secure source of high-quality potable water can be achieved which will result in long term savings and other tangible benefits for their respective customers.
The supply project construction was completed in 1993 and started delivering drinking water to each county in late April of 1993. The original supply project capacity was 12 million gallons per day. In 1998 the project had an expansion to a capacity of 18 million gallons per day. In 2003 there was another expansion bringing the projcet capacity to 36 million gallons per day.