Simpsonville Water Hardness & Quality Report (2026)

Simpsonville, South Carolina, in Greenville County — a fast-growing Greenville County suburb southeast of Greenville, one of the fastest-growing communities in the South Carolina Upstate and the broader Carolinas growth corridor — receives its municipal water from the City of Simpsonville Water Department or the Greenville Water System (GWS), which draws from the Reedy River through the Lake Greenwood supply system or local reservoir impoundments in the Piedmont Upstate corridor.

The moderately soft 92.5 mg/L hardness and TDS of 180.5 mg/L reflect the South Carolina Piedmont's crystalline geological character. The Reedy River and its tributaries drain the South Carolina Inner Piedmont — terrain underlain by Precambrian and early Paleozoic metamorphic rocks of the Kings Mountain Belt, Inner Piedmont Terrane (pelitic schist, amphibolite, and paragneiss), and the Greenville County Piedmont gneiss. These ancient metamorphic crystalline rocks have minimal carbonate content, producing moderately soft, clean Upstate South Carolina river water. The moderate 92.5 mg/L hardness reflects some calcium and bicarbonate from Piedmont metamorphic calcium-plagioclase weathering.

At 92.5 mg/L, Simpsonville's water is moderately soft — comfortable for household use. Scale forms slowly over many months, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 5.2 ppt warrants a certified drinking water filter — the Greenville-Spartanburg International Airport (a major AFFF user), the Michelin North America and BMW South Carolina manufacturing plants in the Upstate corridor, and the broader Greenville County industrial zone contribute to Simpsonville's PFAS reading.