Šiauliai (LT), Bauska, Jelgava andJurmala (LV) cities, situated in the Lieluperiver basin, and are the main polluters ofthe river. The problem of storm water, as asource of pollution in densely populatedareas, has not been duly addressed in theseareas. The overall objective of the project is todecrease pollution in Lielupe river basinresulting from untreated storm water.The project elaborates action plan for furtherintegrated management of storm water inLielupe river basin; deeply analyzes currentsituation in storm water treatment in allpartner cities and gained tools for furtherefficient investments (construction) planningand supervision and raises public awarenesson nature protection in Lielupe river basin.