This book presents state-of-the-art knowledge concerning water quality in Poland. It offers a wide variety of cases and issues on water resource quality management. The book also presents different methods and strategies to effectively use the most advanced water resource quality problems such as water pollution, whether physical, chemical, or biological, of surface water resources and groundwater resources. The authors pay exceptional attention to water quality monitoring in agricultural, urban catchments, and water reservoirs. More light into the water quality is required to assess water's physicochemical status accurately and plan suitable protection actions against recognized threats. This book addresses the needs of professional engineers, researchers, policy planners, decision-makers, stakeholders, and anyone looking to learn more about the quality situation of water resources in Poland and other similar countries and regions.