Introduction. The Willamette River of Oregon - a river restored? The Vistula River in Poland - environmental characteristics and historical perspective. Water quality in the Vistula basin. The Tualatin River - a water quality challenge. Changes in the water chemistry of the Vltava River from 1959 to 1993. An integrated approach - catchment management planning for the River Tyne. Water quality variability in the Aguera stream watershed at different spatial and temporal scales. Sources of pollutants and current status of water quality in the lower reaches of the Nemen and Pregel rivers. Acid-mine water pollution from an abandoned mine. The effect of pollutants from the Vistula River on the water quality of the Bay of Gdansk. Metal loadings to the Baltic Sea from the Poland's rivers. Surface water pollutants and problems with their analysis. Monitoring the water quality of the Radunia River. The influence of industrial and municipal waste on the quality of the environment in Poland, taking Gdansk region as an example. Action taken by the Gdansk Municipality to reduce the loads of pollutants discharged into Gdansk Bay. Monitoring of volatile organic compounds (VOCs) in the surface and sea waters of Gdansk district. Cause analysis of microbiological pollution around the beaches along the Gdansk coast. Leaching of nutrients, heavy metals and pesticides from agricultural land in Sweden. Nutrient non-point pollution in experimental watersheds in Poland. The analysis of nutrient concentration - water flow relationships in a lakeland river. A process for developing water quality criteria under the US Federal Clean Water Act. Differences between Polish standards and EC directives on water quality. Water quality study design for the Willamette Basin, Oregon, using a geographic information system. The role of benefit-cost analysis in water conservation planning. Exploring possibilities for an international water quality index applied to river systems. River water quality modelling in Poland. Mathematical modelling of soil nitrate and phosphate leaching from small agricultural catchments in northern Poland. Water quality modelling of the Rega River and surrounding coastal waters. Environmental protection in the Vistula River valley. Biological barriers in wastewater treatment. Hydrobotanical systems: characteristics and examples in Poland. A multifunctional water management information system (MIS). The state, management, use and protection of natural water resources i the Province of Gdansk. National environmental monitoring program. The legal framework of water quality management in England and Wales. Index.