The main goal of the project is reducing industrial or agricultural wastewater, and stormwater. The use of storm water treatment solutions preventing and combating the spread of hazardous substances into the Baltic Sea through stormwater is still not widespread. Available solutions are low in number, their effectiveness has not been measured and municipalities around the Baltic Sea do not have overview on the nature and dynamics of such substances. It is necessary that countries around the Baltic Sea work on the issue simultaneously, but with piloting different approaches.