Abstract An example of unconventional application of mathematical modeling is presented, where groundwater table regime data is considered as a verification object. A set of models has been developed for the site where sources of pollution are located. The models describe such processes as precipitation transformation on the earth surface, unsaturated flow in vadose zone and groundwater flow. Based on modeling results the variation amplitudes of groundwater levels measured at monitoring wells and annual groundwater recharge have been proved and inconsistent monitoring data have been revealed.