Overview
- Residents blocked Severo del Castillo and 2 de Mayo on March 12 to protest recurring sewage overflows that flooded streets and sidewalks in Corralitos, Guaymallén.
- AYSAM’s contingency plan targets the Severo del Castillo/2 de Mayo system and the Tirasso collector with same‑day overflow control, disinfection, irrigation isolation, and deep cleaning that has removed 452 m³ of solids.
- The utility attributes recent overflows to extreme storms, illegal stormwater connections, corrosion in 1980s‑era conduits, and a low‑slope stretch on 2 de Mayo where sediments quickly reaccumulated by up to 35% within a month.
- Temporary bypasses keep service running during works, and controlled releases to the Pescara canal proceed under continuous chlorination and daily water‑quality monitoring reported to the environmental crimes unit.
- Longer‑term upgrades include Colonia Segovia–Paramillo Stage I at 67.5% completion with a US$15.7 million budget, additional 2026 tenders for US$10.5 million, further stages estimated at US$30.5 million, and the Tirasso renewal 70% complete at US$5.39 million to benefit more than 88,000 residents, with the municipality having declared an environmental emergency.