Drinking Water Quality in Delta and Non-Delta Counties along the Mississippi River
2024
Emily V. Pickering | Chunrong Jia | Abu Mohd Naser
The Mississippi Delta region has worse population health outcomes, including higher overall cardiovascular and infant mortality rates. Water quality has yet to be considered as a factor in these health disparities. The objective of this paper is to determine overall differences in basic water quality indicators, electrolytes of cardiovascular importance, trace elements, heavy metals, and radioactive ions of groundwater in delta and non-delta counties in states along the Mississippi River. Data were sourced from the major-ions dataset of the U.S. Geological Survey. We used the Wilcoxon rank sum test to determine the difference in water quality parameters. Overall, delta counties had lower total dissolved solids (TDS) (47 and 384 mg/L, <i>p</i>-value < 0.001), calcium (7 and 58 mg/L; <i>p</i>-value < 0.001), magnesium (2 and 22 mg/L; <i>p</i>-value < 0.001), and potassium (1.57 and 1.80 mg/L; <i>p</i>-value < 0.001) and higher sodium (38 mg/L and 22 mg/L; <i>p</i>-value < 0.001) compared to non-delta counties. Overall, there were no statistical differences in trace elements, heavy metals, and radioactive ions across delta versus non-delta counties. These results underscore the need for further epidemiological studies to understand if worse health outcomes in delta counties could be partially explained by these parameters.
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