DeSoto Water Hardness & Quality Report (2026)

DeSoto, Texas, in Dallas County south of Dallas — a major Dallas south suburban community in the Cedar Hill–DeSoto corridor with a predominantly African-American population, significant historic ties to the African-American suburban migration in Dallas County — draws its municipal water supply from the Trinity River watershed reservoirs via Dallas Water Utilities, distributed to DeSoto by the City of DeSoto Water Utilities. Water hardness in DeSoto measures 115.5 mg/L — classified as moderately hard.

DeSoto's moderate hardness — notably softer than other Trinity River communities like Euless (322.5 mg/L) and Spring (352.5 mg/L) — reflects Dallas Water Utilities' advanced treatment of the Trinity River supply. Dallas Water Utilities operates multiple water treatment plants serving the Dallas metro, producing treated water in the range of 100–150 mg/L after the highly effective Dallas Water Utilities Elm Fork Water Treatment Plant process. The DeSoto distribution — a 1970s–1990s era Dallas south suburban water system — maintains the effectively treated supply at the moderate 115.5 mg/L in the south Dallas County zone.

At 115.5 mg/L, DeSoto residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Dallas Water Utilities and City of DeSoto Water Utilities consistently deliver water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.