Sherman Water Hardness & Quality Report (2026)

City of Sherman Water serves approximately 45,000 residents in Sherman, Grayson County, Texas. Primary sources include surface water from Lake Texoma and local reservoirs, supplemented by groundwater. Treatment occurs at the city's water treatment plants using conventional filtration with granular activated carbon and sand, followed by demineralization and advanced membrane processes including ultrafiltration and reverse osmosis to reduce dissolved salts and hardness. This combination of surface and groundwater treatment delivers a consistently treated supply to residents throughout the Red River watershed region.

The watershed encompasses the Red River basin, feeding Lake Texoma, a major reservoir on the Texas-Oklahoma border. Underlying geology includes Cretaceous-era formations such as the Woodbine Sand and Trinity Group limestones, which form productive aquifers in Grayson County. These carbonate-rich layers contribute to a hard supply through mineral leaching, while surface waters pick up dissolved ions from sedimentary rock weathering, resulting in naturally mineralised water prior to treatment.

Hard water at 184 mg/L promotes scale buildup in water heaters, dishwashers, washing machines, and faucets, where mineral deposits clog and corrode components, reducing efficiency and lifespan. Regular descaling, vinegar rinses, and professional maintenance help mitigate these effects. A water softener is recommended for households to prevent spotting on dishes, dry skin and hair, and to extend appliance life. The 2023 CCR confirms turbidity compliance; no violations noted for lead, copper, or PFAS. Low arsenic and trihalomethane detections remain below health guidelines, and the system earns excellent compliance grades.