View service for Major Groundwater Reservoir Database. Database contains a classification of Major Groundwater Reservoirs according to the following criteria: resource utilisation, degree of anthropogenic transformations, resistance to contaminants, economic aspect of protective recommendations and water payment rates. The primary purpose of the new map of Major Groundwater Reservoirs is to present updated study results for Major Groundwater Reservoirs in Poland. A distinctive feature of the Major Groundwater Reservoir map developed by the Polish Geological Institute is its up-to-date information based on GIS layers (updated annually). The service complies with the INSPIRE View Service specification requirements. The service uses the WMS OGC 1.3.0 interface.