EN
The influence of two large farms of fur-bearing animals, used for 37 and 35 years, respectively, was assessed with respect to the contamination of surface and underground waters. Some physico-chemical and bacteriological properties of well water, tap water and of the river water situated near those farms were tested. Organoleptic indices were normal, but the concentration of NH₃ in the wells of the two farms (7,68 mg and 7,0 mg per 1 dm³, respectively) was much higher than normal (0,5 mg per 1 dm³). The level of nitrates was also significantly higher, i,e. 11,67 mg and 20 mg per 1 dm³ in the well of the farm S and in the pond of the farm B, respectively. Both surface and underground waters in the area of the two farms contained great amounts of organic substances and hence a much higher level of bacteria than standards permit.