The La Chira Wastewater Treatment Plant (PTAR La Chira) manages 25% of the wastewater generated by the Metropolitan Lima population. With an investment of around US$ 80 million, it handles an average of 6.3 m3/second of wastewater at its typical capacity. The facility, situated in the Chorrillos district, treats wastewater from 18 districts of the capital, including key areas like San Isidro, Miraflores, Santiago de Surco, Barranco, Chorrillos, and Villa El Salvador. The plant has prevented over 78,000 tons of waste from directly reaching the sea, contributing to environmental protection and the improvement of coastal regions. A stretch of 17 km of coastline, once contaminated, has been rejuvenated: from Las Cascadas Beach in Barranco to Conchán Beach in Lurín.

While designed to accommodate a maximum flow of 11.3 m3/second, the plant has, on peak days, effectively treated up to 15 m3/second. In response to this demand, the La Chira consortium, in charge of the concession, suggests expanding the infrastructure. This expansion entails constructing sedimentation tanks that enhance the controlled receipt and dosing of cargo through the submarine outfall.