Figure 1. Distribution of and county-level community water system (CWS) arsenic concentrations (2006–2011, Panel A), proportion of adults with a high school diploma (Panel B), median household income (Panel C), and CDC/ATSDR’s overall socioeconomic status vulnerability index (Panel D) across the conterminous US for N=2,604 counties included in the present analysis.
Counties shown in white were not included in the present analysis because CWS arsenic concentrations were not available for these counties. CDC/ATSDR = Centers for Disease Control and Prevention (CDC) and Agency for Toxic Substances and Disease Registry (ATSDR).