Greenwood Water Hardness & Quality Report (2026)

Greenwood CPW (Greenwood Commission of Public Works) is the 12th largest water utility in South Carolina, serving Greenwood County and surrounding areas. The system's sole water source is Lake Greenwood, an 11,400-acre reservoir created by the Buzzard's Roost Dam near Chappels, South Carolina, constructed between 1935 and 1940. The lake spans 212 miles of shoreline across Greenwood, Laurens, and Newberry counties, with an average depth of 21.8 feet, providing a reliable single-source supply to the service area.

The Saluda River watershed feeds Lake Greenwood through terrain underlain by Precambrian metamorphic bedrock — primarily schist and gneiss — and Paleozoic metasedimentary rocks characteristic of the Piedmont physiographic province. This crystalline basement geology, typical of the Blue Ridge foothills region, naturally produces soft water with low mineral content. The reservoir's water chemistry directly reflects this geology, resulting in a supply that is naturally soft and requires minimal treatment for hardness-related constituents.

At soft hardness levels, Greenwood's water poses minimal scaling risk to household appliances and plumbing. Soap lathers readily, and water heaters, dishwashers, and washing machines experience little mineral buildup. Most residents do not require water softening systems, though some may choose point-of-use treatment for aesthetic reasons. Pipe corrosion is the primary concern rather than scale accumulation. In 2024, Greenwood CPW detected eight regulated substances in drinking water, all at allowable levels with no health-based violations, as detailed in the utility's 2025 Annual Water Quality Report.