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Post-war period in the area of water protection is studied not only in Poland, but in manycountries of Central and Eastern Europe. The subjects of such analysis are: the legislation ofwater protection, economy of waste water treatment plants (WWTP) and the progress in thetechnology of WWTP. The understanding of the approach of the water protection andwastewater dumping became quite important in the last decades for cities, countries andaround of the Baltic Sea. After 1945 many different rules of the waste water discharge torivers, lakes, internal seas and marine water existed. There are many different evaluations,prepared by several professors, like Z. Rudolf, M. Roman, J. Dojlido, M. Gromiec and others.Concepts of these authors were taken into account in this paper. In this publication theevolution of the general rules of water protection during the period of 1945-2005 is presentedand the example of the calculation is given, to illustrate the changes in the legal requirementsover time.

Legal requirements on waste water discharge into rivers, lakes and sea in Poland during the period of 1945-2005