Helsinki Region Environmental Services Authority, known as HSY, is the municipal utility serving the Helsinki metropolitan area. Based in Helsinki, Finland, it provides water supply, wastewater treatment, waste management and environmental information services for the region’s residents and institutions. Its mandate is shared by the member cities of Espoo, Helsinki, Kauniainen and Vantaa, with some services extending to Kirkkonummi.
HSY’s role is practical and city-scale. It supplies drinking water to more than one million people, treats wastewater from households and industry, and builds and maintains water mains and sewer networks. On the waste side, it organises collection and recycling services, runs waste guidance tools, and operates Sortti recycling stations for different waste streams. The organisation also publishes information on air quality, climate and the environment, reflecting a broader public-service mission beyond utilities alone.
The organisation’s website points to several priority areas: waste and recycling, water and sewerage, air quality and climate, and environmental data. It also offers digital services such as the Waste Guide API, which makes waste sorting information available for external use. That suggests a utility with a strong operational base but also a significant data and digital service function.
HSY is not a private company but a municipal authority, which shapes its focus on service continuity, infrastructure and public accountability rather than profit. Its activity is concentrated in the capital region, where it supports daily urban functions that are often invisible until they fail: clean water, working sewers, and reliable waste systems.