Figure 3.
County-level (a) domestic well population and (b) domestic well population with As > 10 μg/L based on probability estimates.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.