Francisco I Madero I Wastewater Treatment Plant, Francisco I. Madero (Puga), Nayarit, Mexico

Francisco I Madero I is a wastewater treatment plant located in Francisco I. Madero (Puga), a locality within the municipality of Tepic, Nayarit, Mexico. The plant serves a population of approximately 2,585 people, placing it in the small agglomeration category. It is situated inland, more than 50 km from the coast. In Mexico, wastewater treatment plants are regulated under the National Water Law (Ley de Aguas Nacionales) and the official standards NOM-001-SEMARNAT-1996 and NOM-002-SEMARNAT-1996, which set discharge limits for pollutants. For small communities like this, treatment typically involves primary or secondary processes to meet these standards. The plant discharges into the local watershed, which ultimately drains into the Pacific Ocean via the Santiago River basin. The region's aquatic ecosystems depend on proper treatment to maintain water quality and support biodiversity. The plant plays a role in protecting downstream water bodies from untreated wastewater.

The plant is located in the Santiago River basin, which flows westward through Nayarit and empties into the Pacific Ocean near San Blas. The river supports diverse aquatic life and is important for local fisheries and agriculture. Proper treatment at this plant helps reduce nutrient and pathogen loads entering the river, protecting downstream ecosystems and human uses.