Midland Water Hardness & Quality Report (2026)

Midland, Texas — the oil and gas capital of the Permian Basin — draws its municipal water supply from the City of Midland Water Utilities, sourcing from the Colorado River Municipal Water District (CRMWD) which delivers water from Lake J.B. Thomas on the Colorado River and O.H. Ivie Reservoir (Concho River tributary) in West Texas, combined with groundwater from the Ogallala Aquifer and local Permian Basin alluvial aquifer wells in Midland County. CRMWD serves Midland, Odessa, and Big Spring in the Permian Basin region. Water hardness in Midland reaches 433.5 mg/L — classified as extremely hard, reflecting the Permian Basin's exceptional mineralogical character.

Midland's extreme hardness reflects the uniquely calcium and sulfate-rich Permian Basin geology of West Texas. The Colorado River headwaters and tributaries crossing the High Plains and Edwards Plateau drain terrain underlain by the Permian San Andres Limestone, Delaware Mountain Group, and associated Guadalupe Series carbonate and evaporite sequences — ancient reef, lagoonal, and evaporite formations deposited in the Permian Sea that covered this region 250 million years ago. These Permian evaporites (gypsum, anhydrite, salt) and carbonates dissolve readily into surface and groundwater, contributing exceptional concentrations of calcium sulfate and calcium bicarbonate. The Ogallala Aquifer here is mineralised by contact with Permian carbonate and evaporite formations in the subsurface.

At 433.5 mg/L, Midland residents face severe scale challenges throughout the home. Calcium and sulfate deposits form within days on every exposed water surface — shower glass, tile, chrome, faucet aerators, and appliance interiors. Water heaters fail rapidly without regular professional descaling, and dishwashers require frequent cleaning to function effectively. A whole-house water softener is standard equipment for virtually every Midland household, and oil-field workers familiar with hard water conditions often bring professional-grade descaling knowledge to their home maintenance routines.