Alto Water and Sanitation District Wastewater Treatment Plant, Ruidoso, New Mexico

Alto Water and Sanitation District is a municipal wastewater treatment facility located in Ruidoso, Lincoln County, New Mexico. It serves a population of approximately 2,120 residents, providing essential sanitation services for this mountainous community in the southwestern United States. The plant operates with secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater facilities. With a designed capacity of 302.83 volume units and a similar discharge volume, the facility is sized to meet the needs of its service area. As a U.S. plant, it operates under National Pollutant Discharge Elimination System (NPDES) permits issued by the New Mexico Environment Department, ensuring compliance with federal and state water quality standards. The treated effluent is discharged into local receiving waters that ultimately drain into the Rio Grande basin. The plant plays a key role in protecting downstream ecosystems, including the Rio Grande's diverse aquatic habitats and the broader watershed that supports agriculture and wildlife in the region.

The plant discharges into local streams that feed into the Rio Hondo and eventually the Rio Grande, a major river system that flows through New Mexico and Texas to the Gulf of Mexico. The Rio Grande basin supports diverse aquatic life and is an important water source for irrigation and municipal use. The plant's secondary treatment helps reduce nutrient and pathogen loads, protecting downstream water quality in this semi-arid region.