[The detection of aeromonads of the "hydrophila-punctata-group" within the hygienic control of drinking water (author's transl)].

The first part brings a retrospective analysis of bacteriological water examinations at single wells at which within a new one year examination period E. coli, coliforms and colony count determinations were performed and in addition the water samples were examined regarding Aeromonas of the "Hydrophila-Punctata-Group". The single wells have been divided in five groups because of the pre-testing and reexamination results and because of the local circumstances. They are summarized in the tables 1-5. The second part reports about the findings of the examination regarding the relation of aerogenic to anaerogenic Aeromonads in wells close to the shore in the direction of infiltration. It also reports about flat wells without influence of surface water in ground-water areas with relatively porous surface layer. Whilst in river water loaded with sewage the anaerogenic Aeromonads dominate the population up to about 80% their proportion diminishes in the shore filtrate so that within a certain distance, in groundwater filtered through the shore, only aerogenic Aeromonads are found. Also, from the water of flat wells with relatively porous surface layer exclusively aerogenic Aeromonads colonies have been isolated. Proceeding from these results the findings of the single wells divided in the groups 1-5 have been discussed. Because the aerogenic Aeromonads have not been found in deep wells but more or less frequently in flat wells the proof of anaerogenic Aeromonas obviously demonstrates a pollution of surface water loaded with sewage.