Cibolo Water Hardness & Quality Report (2026)

Cibolo, Texas, in Guadalupe County — a major south San Antonio rapidly growing suburban community (Cibolo is one of the fastest-growing cities in Texas and the United States — a primarily residential Guadalupe County suburb that grew from approximately 3,000 residents in 2000 to over 40,000 by the mid-2020s, driven by San Antonio metro suburban expansion and Joint Base San Antonio–Randolph proximity), a diverse Guadalupe County community with a significant military professional, Hispanic-American, and suburban professional population, home of Cibolo Creek (a significant Guadalupe County creek — part of the San Antonio River watershed), and in the rapidly urbanizing San Antonio northeast suburban corridor — draws its municipal water supply from the Edwards Aquifer and Canyon Lake via the City of Cibolo Water Division. Water hardness in Cibolo measures 273 mg/L — classified as extremely hard.

Cibolo's extremely hard supply reflects the south Texas Edwards Limestone aquifer's highly calcareous geology. The Edwards Aquifer at Cibolo–Guadalupe County draws from the Cretaceous Edwards Limestone (one of the most calcareous aquifer systems in North America — the Edwards is a karst limestone aquifer with extremely high dissolved calcium carbonate). Canyon Lake (Guadalupe River — also draining Hill Country limestone) provides similarly hard supply. Combined, they produce the extremely hard 273 mg/L.

At 273 mg/L, Cibolo residents face severe hard water challenges. Regular descaling, water softeners, and appliance protection are strongly recommended. City of Cibolo Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.