Summary:

Basic work objective is determination of quality changes in superficial water connected with economic development in Bialystok district and creating basics to take action to improve water state and their protection from pollution, caused by influence of being-communal agriculture, protection against industrial pollutant, salinity and especially damaging environment substances. Researches was conducted during 3 years since 2005 to the end of 2007 in 12 researching points. Researches of water was conducted at angle of biogenous, aerobic and physical indicators according to obligatory standards and methodologies. There were made and investigation concerned to state of water supply and sewage disposal and rate of economic development in Bialystok district. Based on received information spotted, that with economic development gradually quality of sewage draining to water and superficial water is getting better, but it is still important to invest in water supply and sewage disposal facilities, like also in improvement of economic management.