Tlahualilo Wastewater Treatment Plant, Tlahualilo de Zaragoza, Durango, Mexico

The Tlahualilo wastewater treatment plant is located in the town of Tlahualilo de Zaragoza, in the state of Durango, Mexico. It serves a population of around 11,538 residents, classifying it as a medium-sized facility for a rural community. The plant is situated in an arid region of northern Mexico, where water resources are scarce and treatment is critical for local reuse and environmental protection. As a Mexican wastewater facility, Tlahualilo operates under the federal Ley de Aguas Nacionales and is subject to NOM-001-SEMARNAT-1996, which sets maximum permissible limits for pollutants in treated wastewater. For a plant serving a population of this scale, secondary treatment is typically required to meet discharge standards. The regulatory framework ensures compliance with national water quality objectives. The treated effluent from the plant is likely discharged into local arroyos or used for agricultural irrigation, given the region's arid climate and agricultural activity. The area drains into the endorheic basin of the Nazas River, which feeds the Laguna de Mayrán, an important wetland ecosystem. Proper treatment helps protect this sensitive environment from nutrient pollution and supports water reuse in a water-scarce region.

The Tlahualilo plant discharges into the Nazas River basin, an endorheic system that terminates in the Laguna de Mayrán, a seasonal wetland in the Chihuahuan Desert. This wetland provides critical habitat for migratory birds and endemic species. In this arid region, treated wastewater is a vital water source for agriculture and ecosystem maintenance, making effective treatment essential to prevent eutrophication and salinization of the lagoon.