Roswell Water Hardness & Quality Report (2026)

Roswell, Georgia, in northern Fulton County along the Chattahoochee River north of Atlanta, draws its municipal water supply from the Chattahoochee River via the City of Roswell Water and Sewer Division, operating a direct river intake on the Chattahoochee in Fulton County north of Atlanta. The Chattahoochee at the Roswell reach is relatively close to the river's Blue Ridge mountain headwaters, reflecting more of the Georgia Piedmont crystalline character. Water hardness measures 124.5 mg/L — classified as moderately hard.

Roswell's moderate hardness reflects the Chattahoochee River's gradual mineral accumulation between its Blue Ridge origin and the northern Fulton County reach. Upstream of Roswell, the Chattahoochee drains the Georgia Blue Ridge Province (Precambrian Tallulah Falls Formation quartzite and mica schist) — very soft terrain. By the Roswell reach, the river has crossed into the Georgia Piedmont — underlain by Ordovician–Silurian Brevard Zone metagranite and amphibolite and the Chattahoochee River metamorphic terrain — contributing moderate mineral content from Piedmont crystalline rock interactions. Roswell's 124.5 mg/L shows the natural hardness of Chattahoochee River water at this mid-Piedmont reach, before the additional infrastructure mineral acquisition observed in South Fulton (136.5 mg/L).

With hardness at 124.5 mg/L, Roswell residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Dishwashers produce cleaner glassware with rinse-aid. City of Roswell Water and Sewer Division consistently delivers water meeting all Georgia EPD and EPA Safe Drinking Water Act requirements.