The studies of the water of the Sułów-Radziądz Młynówka supplying the ponds in Ruda Sułowska carried out during 10 years /1974-1984/ enabled us to characterize its physicochemical constitution and to evaluate it using classification system obligatory in our country. The water quality of the Młynówka river became worse. The parameters disqualifying water usability in fish ponds exceeded standard values of iron, manganese, zinc, oxydability and oxygen deficiency.