The Secretaria Municipal de Águas e Saneamento (Semasa) in Lages is dedicated to managing and enhancing essential sanitary services in compliance with Brazil's Federal Law No. 11.445. This municipal entity is responsible for the coordination, planning, execution, and operation of public sanitation services. Semasa offers vital services including water supply management, wastewater treatment, and solid waste collection.

Residents benefit from a range of resources, such as a selective waste collection schedule, which encourages recycling in the community. Recent initiatives by Semasa have included the installation of emergency reservoirs to improve water supply and efforts to resolve water shortages in specific residential areas. Additionally, the organization prioritizes water quality through regular reservoir cleanings and maintenance tips for residents regarding their water systems. With convenient communication channels including a hotline and WhatsApp service, Semasa remains committed to ensuring the health and sustainability of Lages' water and sanitation infrastructure.