Kentwood Water Hardness & Quality Report (2026)

Kentwood, Michigan, in Kent County south of Grand Rapids — a major Grand Rapids south suburban community, one of the largest cities in Michigan, known for its diverse Calvin University and its large Hmong-American, Mexican-American, and Arab-American communities, a major retail and corporate corridor along 28th Street — draws its municipal water supply from the Grand River Valley alluvial aquifer and Kent County calcareous glacial outwash wells via the City of Kentwood Water Division. Water hardness in Kentwood measures 119 mg/L — classified as moderately hard.

Kentwood's moderate hardness reflects the Kent County Grand River Valley calcareous glacial terrain. The Grand River Valley aquifer at Kentwood–Grand Rapids is recharged from: Kent County Wisconsin Age glacial outwash (calcareous-moderate till and outwash from the Michigan Lobe — less calcareous than the Valparaiso Moraine zones to the south); the Silurian–Devonian calcareous dolomite subcropping under Kent County (the Michigan Basin Lockport Dolomite and Bass Island Dolomite — some dissolved calcium from the subcrop contact); and the Grand River alluvial sand and gravel recharge. The Kent County moderately calcareous glacial terrain produces the moderate 119 mg/L at Kentwood.

At 119 mg/L, Kentwood residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. City of Kentwood Water Division consistently delivers water meeting all Michigan EGLE and EPA Safe Drinking Water Act requirements.