Cocachacra Wastewater Treatment Plant, Arequipa, Peru

Cocachacra wastewater treatment plant is located in the district of Cocachacra, Islay Province, Arequipa Region, Peru. The plant serves a population of approximately 4,092 residents, providing secondary treatment for municipal wastewater. It is situated inland, more than 10 km from the coast, and operates as part of Peru's national wastewater management framework. The plant employs secondary treatment processes, which involve biological treatment to reduce organic matter and suspended solids. With a discharge volume of 829.44 m³/day, the facility meets the treatment standards expected for a community of this size under Peruvian regulations. Peru's wastewater sector is governed by the Ministry of Housing, Construction and Sanitation, which sets effluent quality standards for municipal plants. Treated effluent from Cocachacra is discharged into the local watershed, which ultimately drains into the Pacific Ocean via the Tambo River basin. The receiving water body supports aquatic life and agricultural activities in the arid coastal region. Proper treatment helps protect downstream ecosystems and water quality for communities relying on these water resources.

The plant discharges into the Tambo River basin, which flows southwest through the Arequipa region and empties into the Pacific Ocean near the town of Cocachacra. The river supports irrigated agriculture and provides habitat for native fish species. Downstream coastal waters are part of the Peruvian marine ecosystem, which is influenced by the Humboldt Current and supports rich biodiversity, including seabirds and marine mammals. Effective wastewater treatment is essential to prevent nutrient pollution and protect these sensitive environments.