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The natural occurrence of uranium enriched in U234 has been noted in both Russia and North America [Thurber, 1962]. The same phenomenon was reported by one of the present authors in the course of a recent study of the natural α radioactivity of English drinking waters [Hill, 1962]. This observation was made on the basis of the relative areas of the 4.18‐ and 4.76‐Mev peaks in the α particle energy spectrum of an untreated water residue. The absence of interference from Ra226 in the 4.76‐Mev peak was inferred from the absence from the spectrum of α peaks due to Ra226 daughters.