Summary:

The area of upper catchment of Nysa Kłodzka River, situated in Eastern Sudety mountains, was chosen to analyze. Groundwater monitoring in last years indicate for lower levels of groundwater than reliable for long-term observations in most of monitoring points. In connection with tendencies to groundwater lowering on lowland area the attempt of long-term observations of upper catchment of Nysa Klodzka River groundwater was taken. The aim of the article is characterization of changes of groundwater depth level of Quaternary aquifer layer in period 1971–2005, based on observations carried out on wells in Domaszków, Stronie Śląskie and Szalejów Górny. The analyzed over 30-years period of observations makes possible interpretation of groundwater level changes in relation to precipitation in the region. Carried out analyzes of precipitation in period 1971– –2005 on discussed area of Sudety mountain indicate their periodic character with years much above and much below of long-term norm. In analyzed period of 1971–2005 (wells Domaszków and Szalejów Górny) and 1980–2005 (well Stronie Śląskie) statisticly important changes in groundwater level are not observed. The conclusion is that the lowering of groundwater level in mountain area of catchment of Nysa Kłodzka River is not observed, which is observed in many wells on lowlands.