This technical report contains detailed data which are underlying the information evaluated and presented in the EEA Environmental Assessment Report ie Groundwater Quality and Quantity in Europe, European Environment Agency (1999). Data were mainly received from questionnaires distributed to 44 European countries through the EEA�s Environmental Information and Observation Network (EIONET) including the 18 EEA member countries, 13 Phare countries, 7 Tacis countries and 6 other European countries. Responses were received from 37 countries.