Playa Colorada Wastewater Treatment Plant, Sinaloa, Mexico

Playa Colorada is a wastewater treatment plant located in the coastal town of Playa Colorada, within the municipality of Angostura, Sinaloa, Mexico. The plant serves a small population of 729 residents, reflecting its role in a rural or small coastal community. It operates under Mexico's national water regulations, which require secondary treatment for discharges into coastal environments. The plant provides secondary treatment, a standard level for municipal wastewater in Mexico, and has a designed capacity of 138.24 m³/day, with an actual discharge volume of 77.76 m³/day. This indicates the plant is operating below its capacity, which is typical for small seasonal communities. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant is located within 10 km of the coast, meaning its treated effluent likely discharges into the Pacific Ocean or a nearby coastal lagoon. This proximity to marine waters necessitates compliance with Mexico's official standards for wastewater discharge to protect coastal ecosystems and public health. The plant plays a key role in preventing untreated sewage from reaching the Gulf of California, a biodiverse marine region.

The plant's treated effluent likely discharges into the Pacific Ocean via a coastal lagoon or directly into the Gulf of California. This region supports diverse marine life, including fish, crustaceans, and migratory birds, and is important for local fisheries. Secondary treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in coastal waters.