Summary:

The paper presents the efficiency of the sewage treatment based on the ex-ample of the sewage treatment plant for Krynica-Zdrój. The research was carried out from January 2006 to December 2007. The following sewage pollution indexes were physico-chemically tested: BOD5, CODCr, total suspended solids, general ni-trogen and general phosphorus. The reliability coefficient (RC) was calculated for each of the analyzed indexes. The amount of the transgressions of the admissible index values in relation to the water law permission was defined. Moreover, the ef-fectiveness of the indexes' decrease in the tested period was analyzed. Additionally the amount of sewage flowing into the treatment plant in each months of the tested period was presented. The carried out research showed the high efficiency of the pollutants' removal. The average reduction of the tested indexes balanced on the level of: BOD5 - 95,03%, CODCr - 90,98%, total suspended solids - 94,76%, gen-eral nitrogen - 79,79%, general phosphorus - 63,5%.