Abstract: The invention relates to a culture medium for the detection of Clostridium perfringens. The invention consists in: dissolving protease peptone, microbiological peptone, yeast extract, sodium bisulphite and ferric ammonium citrate in deonized water; sterilising said solution at 121° C. for 15 minutes and cooling same; and, subsequently, adding cycloserine and disodic salt of 4-methylumbelliferyl phosphate, dissolved in deionized water and sterilised by means of filtration. The inventive culture medium is distributed into 150 ml nominal capacity bottles, at a proportion of 50 ml, for refrigerated storage and use within 15 days of the preparation date. The invention is suitable for use in the detection of Clostridium perfringens in water following the inoculation of a 100 ml sample in a bottle containing 50 ml of medium and incubation at 45° C. for between 18 and 20 hours in aerobic conditions.