Rebeca I Wastewater Treatment Plant, Ejido Rebeca Uno, Sinaloa, Mexico

Rebeca I is a wastewater treatment plant located in Ejido Rebeca Uno (Primero de Mayo), within the municipality of Culiacán, Sinaloa, Mexico. The plant serves a small population of approximately 2,191 residents, reflecting its role in a rural or peri-urban community. As a secondary treatment facility, it provides biological treatment to reduce organic pollutants and suspended solids before discharge. Under Mexican regulations (NOM-001-SEMARNAT-1996 and subsequent updates), secondary treatment is the standard for municipal wastewater to meet discharge limits for biochemical oxygen demand and total suspended solids. The plant has a designed capacity of 207.36 m³/day, which matches the reported discharge volume, indicating full utilization. Secondary treatment typically involves activated sludge or similar biological processes. The plant's proximity to the Pacific coast (within 10 km) means its treated effluent may eventually reach coastal waters, potentially impacting marine ecosystems. The plant likely discharges into a local stream or drainage system that flows toward the Gulf of California. This coastal location underscores the importance of effective treatment to protect sensitive coastal habitats and support local water quality.

The plant is situated near the Pacific coast of Sinaloa, within the drainage basin that ultimately flows into the Gulf of California. This region supports diverse marine life, including fish, crustaceans, and migratory birds. The treated effluent from Rebeca I enters local waterways that may contribute to coastal nutrient loads, making secondary treatment essential for minimizing eutrophication risks and preserving the ecological health of the adjacent marine environment.