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The oxygen ( 18 O/ 16 O) isotope analysis of hair is commonly applied to reconstruct an individual’s residence history. However, region-of-origin as determined from oxygen isotope values ( δ  18 O) alone is often spatially indistinct. Adding additional geochemical recorders can refine region-of-origin estimates. In this capacity, strontium ( 87 Sr/ 86 Sr) isotope analysis has attracted increased interest. While  87 Sr/ 86 Sr reflects the influences of local geology,  87 Sr/ 86 Sr of hair includes both external environmental signals as well as the internal dietary indicators. To better understand the impact of these contributions to the spatial signal encoded within  87 Sr/ 86 Sr of hair, human hair was collected from three locations within Salt Lake City, Utah along with the donor’s sex. The  87 Sr/ 86 Sr and  δ  18 O of hair and local tap water were measured. There were no significant relationships between sex and either  δ  18 O or  87 Sr/ 86 Sr of hair, nor between collection location and the  δ  18 O of hair. However, we found significant associations between collection location and  87 Sr/ 86 Sr of hair. These findings suggest that interactions with local water may be an important source of Sr to human hair and that the  87 Sr/ 86 Sr of hair may have the capacity to record differences in  87 Sr/ 86 Sr of tap waters on small spatial scales.

Strontium isotope ratios of human hair record intra-city variations in tap water source