Major beaches in the Polish part of the lagoon are Stepnica, Trzebież, Czarnocin, Lake Nowowarpieńskie and Wolin. The municipalities differ considerably in terms of population and income. The municipalities with the highest income are the tourism resorts located on the Baltic Sea coast. Municipalities around the lagoon have an income below the national average mainly from farming, light industry and commerce. However, tourism is still growing and of increasing importance. Especially the fast development of marinas in the lagoon with about 2 400 mooring spaces is one indicator (10 marinas on the Polish side

with altogether about 600 mooring spaces as well as 14 marinas in the German part of the lagoon) (Steingrube et al., 2004). The regional plan by the Marshal of Zachodniopomorskie Voivodship Target Selective Inhibitor Library price suggests the creation of a West Pomeranian Sailing Route covering GSK-3 inhibitor the lagoon and the Baltic. It includes new sport boat harbours and the modernization of existing ones. For a further development of tourism around the lagoon a good water quality is imperative. During recent years, the Oder/Odra estuary faced many problems with microorganisms. A Salmonella pollution event in the sea-side resort Miedzyzdroje caused a beach closing for more than 4 weeks during high-season in August 2008. High concentrations of V. vulnificus were frequently found in Karlshagen, Island of Usedom

and in Lubmin, Greifswald Bodden. In 2009, the maximum was above 1 million germs per litre in Lubmin. In 2003, Nabilone 2010 bathers died after a vibrion infection and in 2006, three people fell ill but and were saved only by fast application of antibiotics (LAGUS pers. com). However, most common are problems due to high concentrations of coliform, E. coli and Enterococci bacteria. In the past, coliform bacteria often caused a closing of beaches according to EU Bathing Water Quality Directive (76/160/EEC), e.g. in Stepnica (from 08.08.2006 for 25 days; from 19.07.2006 for 15 days), in Trzebież (from 01.08.2006 for 42 days; from 20.07.2007 for 42 days; from 24.07.2008

for an unknown period) and in Czarnocin (from 27.07.2006 for 50 days; from 10.07.2007 for 35 days and from 01.08. 2008 for an unknown number of days). Data on bathing water quality in Poland are publicly provided by the Chief Sanitary Inspectorate. Data on local bathing water quality are also available on the websites of public health services. Insufficiently treated sewage water is the most important reason for microbial problems and caused serious water quality problems in the lagoon during the last decades. Today the situation is improving because 288 million Euros have recently been invested in sewage treatment plants around the city of Szczecin, which is the major centre and located at the Odra river, north of the lagoon.