Summary:

The article presents effectiveness of sewage treatment in Dąbrowa Tarnowska treatment plant. The research was carried out in the period from January 2005 to September 2007. Two indexes from the basic group: BOD₅, total suspended solids and from the eutrophic group: general nitrogen and general phosphorus were physicochemically analysed. Efficiency of treatment was on the low level, which concerns basic pollution indexes BOD₅ and total suspended solids, as well as biogenic compounds (general nitrogen and general phosphorus). The reason for this may be bad technical state of the treatment plant, which was built in the sixties of the 20^th century. The problem may be solved by building a modern sewage treatment plant, which allows to treat sewages up to the level admissible by the obliging Ordinance.