Recently, issues related to groundwater pollution are more than relevant. Not only megapolices, but also small settlements, are literally mired in mud, which is reflected in the groundwater flowing in the area. For a decade, we have been studying the quality of groundwater in St. Petersburg, Russia. And the results are mixed. On the one hand, industrial facilities have declined and their impact too. On the other hand, the population is growing and along with the consumption of raw materials, the volume of environmental pollution is growing. Thus, the value of water pollution is changed. The number of contaminants is modified.