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The United States Environmental Protection Agency monitors contaminants in drinking water and consolidates these results in the National Contaminant Occurrence Database. Our objective was to assess the co-occurrence of metal contaminants (total chromium, hexavalent chromium, molybdenum, vanadium, cobalt, and strontium) over the years 2013-2015. We used multilevel Tobit regression models with state and water system-level random intercepts to predict the geometric mean of each contaminant occurring in each public water system, and estimated the pairwise correlations of predicted water system-specific geometric means across contaminants. We found that the geometric means of vanadium and total chromium were positively correlated both in large public water systems (r = 0.45, p &lt; 0.01) and in small public water systems (r = 0.47, p &lt; 0.01). Further research may address the cumulative human health impacts of ingesting more than one contaminant in drinking water.

Co-Occurrence of Metal Contaminants in United States Public Water Systems in 2013–2015