Alton Water Hardness & Quality Report (2026)

Sharyland Water Supply Corporation provides water to Alton, Texas, in Hidalgo County, serving residential and commercial customers throughout the northern Rio Grande Valley. Their raw water originates from the Rio Grande River, accessed via a canal system managed by the U.S. Section of the International Boundary and Water Commission. Treatment occurs at the utility's facilities, situated near 321 S. Shary Blvd. in Alton, with distribution extending to parts of Mission and surrounding areas. The Rio Grande watershed itself is extensive, originating in the San Juan Mountains of Colorado and traversing diverse landscapes before reaching the fertile southern tip of Texas.

The geology beneath Alton is characterized by thick layers of Cretaceous-period limestone and dolomite, notably formations such as the Edwards and Georgetown limestones. These are frequently intermixed with alluvial deposits from the Rio Grande. While the river is the main source, the underlying calcareous soils and aquifers, including the Carrizo-Wilcox Aquifer, contribute to the water's chemistry through the natural dissolution of minerals from the bedrock. This geological makeup is the reason for the water's inherently hard character, driven by elevated levels of naturally occurring dissolved minerals.

This very hard water can lead to noticeable scale buildup within household pipes, water heaters, dishwashers, and washing machines, which can decrease their efficiency and shorten their operational lifespan. Homeowners often observe visible mineral deposits on appliances like coffee makers and faucets, and may notice that soap scum forms more readily in bathrooms, requiring more detergent for laundry. Regular maintenance, such as descaling fixtures and flushing water heaters, is advised. To effectively combat these issues, installing a whole-house water softener at the point of entry is highly recommended to protect all plumbing and appliances.