W. Mioduszewski l, M. Fic2 and A. Zdanowiczi 'Department of Water Resources IMUZ Falenty, 05-090 Raszyn, Poland, fax: +48 22 6283763 2Department of Sanitation IMUZ, 05-090 Raszyn, Poland, fax: +48 22 6283763


Human economic activity and agricultural use of nutrient compounds from fertilization, is posing a serious threat of pollution to groundwater. Agricultural use of fertilisers in infiltration areas is particularly detrimental, due to its impact on the water that percolates directly down to the aquifer. Numerous studies and measurement data show that water in shallow farm wells drawn from the unconfined aquifer contains excessive nitrate amounts that make it an unfit source of potable water. Much better quality characterises water found in confined layers insulated from the ground surface, lying at a greater depth and retained over a longer period (Bowen 1986; Fetter 1999).