San Pedro Mártir Wastewater Treatment Plant, Santiago de Querétaro, Querétaro

San Pedro Mártir is a wastewater treatment plant located in Santiago de Querétaro, Querétaro, Mexico. It serves a population of around 452,027, classifying it as a large agglomeration under Mexican water management standards. The plant is situated inland, more than 50 km from the coast, and its treated effluent is discharged into local water bodies that ultimately drain into the Gulf of Mexico. As a large-scale facility, San Pedro Mártir is expected to comply with Mexico's official standards for wastewater treatment (NOM-001-SEMARNAT), which mandate secondary treatment and additional nutrient removal for plants serving over 100,000 people. The plant's design and operational parameters align with these regulatory requirements to protect receiving waters. The plant's discharge contributes to the local watershed, which flows through the Querétaro region and eventually reaches the Pánuco River basin. This river system supports diverse aquatic life and provides water for agricultural and urban uses downstream. Proper treatment at San Pedro Mártir is essential to prevent eutrophication and maintain water quality in the region's rivers and reservoirs.

The plant discharges into the local drainage network that feeds into the Pánuco River basin, which flows eastward to the Gulf of Mexico. This watershed supports a variety of freshwater species and is used for irrigation and drinking water supply. Effective treatment is critical to prevent nutrient loading and protect downstream ecosystems, including coastal lagoons and estuaries.