In 2010 − 2012 the hydrogeological model (HM) of Latvia was developed and was named LAMO by scientists of Riga Technical University (RTU). The model comprises geological and hydrogeological information accumulated by the Latvian Environment, Geology and Meteorology Center (LEGMC). LAMO simulates the active groundwater zone that provides drinking water. To ensure compatibility with models of other countries, the worldwide used commercial program Groundwater Vistas (GV) is applied for running LAMO. In 2013 − 2014 LAMO was considerably upgraded and since 2012 three versions (LAMO1, LAMO2, LAMO3) of the HM have been developed. Density of the hydrogeological network was increased, transmissivity distributions for aquifers were refined and special software tools were developed to join the elements of hydrographical network (rivers, lakes, sea) with the HM body. In the paper the main innovations that have converted the LAMO2 into the next LAMO3 version are considered.