In the territory of the city of Rijeka (from Preluk to Pećine) sea water quality is controlled ten times during the bathing season, in the period from May to September, namely from the beginning to the end of the bathing season at 21 measuring points.

The activities of analysing and monitoring of sea water quality at beaches have been entrusted to the Educational Institute of Public Health of the Primorje – Gorki Kotar County.

The raising of sea water quality over the past few years is a result of considerable investments made in the construction of the sewage system and attempts to connect a maximum number of buildings to the system.