Clayton Water Hardness & Quality Report (2026)

Clayton, North Carolina, in Johnston County — a Johnston County town adjacent to Smithfield and Garner, in the rapidly growing Research Triangle exurban corridor southeast of Raleigh in the Johnston County Neuse River corridor — receives its municipal water from the Town of Clayton Water Division, drawing from the Neuse River or Johnston County water system in the east Piedmont corridor.

The moderately soft 73 mg/L hardness and low TDS of 117.1 mg/L reflect the Neuse River watershed's North Carolina eastern Piedmont and Coastal Plain transition character. The Neuse River at Johnston County drains the North Carolina Piedmont (Proterozoic and Cambrian crystalline gneiss, Carolina Slate Belt metavolcanic — all relatively insoluble silicate rock) and the transitional Coastal Plain (Cretaceous and Tertiary unconsolidated sand and clay — low mineral content). The combined soft-to-moderate Piedmont-Coastal Plain drainage produces the moderately soft water characteristic of the eastern Piedmont Raleigh corridor.

At 73 mg/L, Clayton's water is moderately soft — comfortable for household use. Scale forms slowly, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 3.9 ppt warrants a certified drinking water filter — the Seymour Johnson Air Force Base (Goldsboro, Wayne County — Air Combat Command, AFFF user in the Neuse River watershed), the Research Triangle Park industrial-biotech corridor, and the Johnston County PFAS background contribute to Clayton's readings.