Helsinki Region Environmental Services Authority

At HSY, we provide municipal water supply and waste management services, as well as information on the Helsinki metropolitan area and the environment.

We work with the aim of the most sustainable urban area in the world. We produce up-to-date information on the air quality in the Helsinki metropolitan area. We calculate greenhouse gas emissions in the Helsinki metropolitan area and promote the achievement of the region’s climate goals. We provide geographic information for the needs of a growing region.

HSY promotes the achievement of climate, circular economy and sustainable development objectives in the Helsinki metropolitan area. We support cities’ climate efforts by generating up-to-date information and strengthening regional co-operation.  Read more about how the region is preparing for the effects of climate change and reducing vulnerability: 


Water flowing through vegetation in a small creek surrounded by smooth rocks.

Nature-based Solutions for Stormwater Management in the Helsinki Metropolitan Area, Finland

The report provides a snapshot of the definitions, types of solutions and co-benefits of nature-based solutions for stormwater management both in the Helsinki Metropolitan Area and globally. Based on the findings, the report discusses factors facilitating and hindering nature-based solutions for stormwater management.

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