The roots, stems, leaves and flowers of common reeds growing in natural environment and in a hydrophyte sewage treatment plant were analyzed for content of Cu, Ni, Zn, Cr, Pb and Cd by at. absorption spectroscopy after their drying and mineralization in aqua regia. The hydrophytes from the sewage treatment pond contained substantially more of the heavy metals then the plants growing in the natural pond. The max concns. of the metals were 28.95, 12.79, 119.1, 16.43, 98.29 and 7.82 mg/kg of dry mass, resp. Cu and Ni were mainly collected in roots, while Zn and Cr in roots and stems. Job and Cd were uniformly distributed in the whole plant. The highest concns. of heavy metals were obsd. in reeds growing in the inlet part of the sewage treatment pond.