Estacion Llano Wastewater Treatment Plant, Sonora, Mexico

Estacion Llano is a wastewater treatment facility located in the small community of Estación Llano, within the municipality of Santa Ana, Sonora, Mexico. The plant serves a population of approximately 319 people, reflecting its role in managing domestic wastewater for a rural settlement in the arid northwestern region of Mexico. The plant operates with secondary treatment, which is the standard level required under Mexican regulations (NOM-001-SEMARNAT) for municipal wastewater before discharge into receiving bodies. With a designed capacity of 203.04 units and a current discharge volume of 30.24 units, the facility has ample capacity to handle current loads. The regulatory framework in Mexico mandates compliance with maximum permissible limits for pollutants, and plants like this are typically overseen by state water authorities. The treated effluent from Estacion Llano is discharged into local watercourses that ultimately drain into the Gulf of California, part of the larger Sonora River basin. The region's arid climate means that water resources are scarce, and the plant's operation helps protect downstream ecosystems and supports water quality in the area. The facility contributes to safeguarding the health of the local watershed and the marine environment of the Gulf.

The plant discharges into local streams that flow towards the Sonora River basin, eventually reaching the Gulf of California. This coastal marine environment supports diverse aquatic life, including fish and invertebrates, and is an important migratory corridor for species. The arid Sonoran climate makes water quality management critical for maintaining ecological balance and supporting local communities.