Horn Lake Water Hardness & Quality Report (2026)

Horn Lake, Mississippi, in DeSoto County — a major northwest Mississippi Memphis suburban community (Horn Lake is a significant DeSoto County city — one of the most important Memphis suburban communities in northwest Mississippi; Horn Lake is part of the north Mississippi Memphis metropolitan area (the Memphis metropolitan statistical area extends significantly into northwest Mississippi — DeSoto County is one of the fastest-growing counties in Mississippi, driven by Memphis suburban growth; Horn Lake, Southaven, Olive Branch, and Hernando form the major cities of the northwest Mississippi Memphis suburbs)); Horn Lake has experienced significant growth as Memphis suburbanites sought lower Mississippi property taxes and affordable housing while maintaining access to the Memphis job market (the DeSoto County–Memphis suburban corridor is one of the most significant cross-state metropolitan growth patterns in the mid-South), a diverse DeSoto County community with a significant African-American, white working-class, and suburban family population, adjacent to Southaven in the DeSoto County northwest Mississippi corridor — draws its municipal water supply via the DeSoto County Water Division. Water hardness in Horn Lake measures 68.5 mg/L — classified as moderately soft.

Horn Lake's moderate softness reflects the northwest Mississippi DeSoto County Memphis Sand aquifer's calcareous-poor character. The Sparta Sand (Memphis Sand) Aquifer at Horn Lake draws from Eocene calcareous-poor Sparta Sand with effective treatment, producing the moderately soft 68.5 mg/L.

With hardness at 68.5 mg/L, Horn Lake residents enjoy moderately soft water. DeSoto County Water Division consistently delivers water meeting all Mississippi MDEQ and EPA Safe Drinking Water Act requirements.