ABSTRACT: This paper describes work performed during decontamination of soil, rock and groundwater. We particularly focused on developmental trends in mineral and spa water pollution in Sliač – Kováčová, because this area is in the 2nd protective zone of natural healing sources. A decontamination drain system was successfully used in this project for the first time in Slovakia. The most advanced survey methods, including geo-physical proton magnetic resonance and dipole electromagnetic profiling (DEMP), were used to identify incidences of soil and rock contamination. The decontamination of the soil and rock was performed using in situ and ex situ methods and differing technologies for pollution decontamination were utilized. Contamination in buildings and other constructions was also discovered and eliminated.