Abstract: The study presents the organization of geo-environmental monitoring system decentralized water supply, analyzes the effect of endogenous factors on the results of geo-environmental monitoring of decentralized water supply using geoelectric express control methods. Groundwater regime depend on a variety of geological, hydrogeological, geomorphological and other conditions. The main factors include of forming mode lunar-solar perturbations which directly affect the level of groundwater and deformation of rocks. Spectral analysis showed that there is a connection between fluctuations in the groundwater level with diurnal and semidiurnal tides. Especially, this relationship manifests itself in the aquifer with low porosity. This dependence should be considered in the simulation in order to remove endogenous interfering in the results of geoenvironmental monitoring of groundwater.