Stan chemiczny wód podziemnych aglomeracji łódzkiej

The article identifies the hydrogeochemical environments controlling the chemical composition of groundwater in the Lódż agglomeration. The study was conducted with a different position of the groundwater table within: the Quaternary, Upper- and Lower Cretaceous aquifers. These aquifers are continuously exploited from a long time till present.The papers focuses on geogenic factors resulting from geological construction, lithology, circulation in the Lódź basin and anthropo-genic factors associated with the change of the circulation system and the potential migration of pollution from the surface.The chemical composition of water from the Quaternary, Upper- and Lower Cretaceous aquifers was stable, without any anthropo-genic changes. The hydrochemical inversion of water within the Cretaceous aquifers is the result of the different lithology of these aq-uifers and the variation in the way and magnitude of groundwater recharge.