Eagle Pass Water Hardness & Quality Report (2026)

Eagle Pass, Texas, the Maverick County seat — a major south Texas Rio Grande border city (Eagle Pass is the Maverick County seat and one of the most significant Texas–Mexico border crossings; Eagle Pass is the site of the Eagle Pass–Piedras Negras International Bridge, one of the most important Rio Grande crossings between Texas and the Mexican state of Coahuila; Eagle Pass gained national attention during the 2023–2024 US border crisis when it became one of the most active points of unauthorized border crossing in the United States, with significant Texas National Guard and US Border Patrol deployments), a diverse Maverick County community with a predominantly (over 95%) Hispanic-American population (Eagle Pass is one of the most strongly Hispanic-majority cities in Texas — the community culture, commerce, and daily life are deeply binational with Piedras Negras, Coahuila across the Rio Grande), adjacent to the Rio Grande in the south Texas brush country, and a community shaped by its position on one of the most active US–Mexico border corridors — draws its municipal water supply via the City of Eagle Pass Water Division. Water hardness in Eagle Pass measures 361.5 mg/L — classified as extremely hard.

Eagle Pass's extreme hardness reflects the south Texas Maverick County Rio Grande border aquifer's highly calcareous limestone karst character. The Rio Grande alluvial aquifer draws from the Cretaceous Edwards Limestone (highly calcareous karst). Very limited softening produces the extreme 361.5 mg/L.

At 361.5 mg/L, Eagle Pass residents face severe hard water challenges. Water softeners and regular appliance descaling are essential. City of Eagle Pass Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.