Overview of water quality in Principal Aquifers
![Overview of water quality in Principal Aquifers in the U.S. with colored pie charts showing data](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/PA%20Index%20Map-20PAs-06062022-wnewbig%26red.png?itok=9Upwg-Kr)
Detailed Description
Overview of water quality in Principal Aquifers. The colored pie charts indicate the proportion of the area studied that contained a constituent in untreated groundwater at a concentration that exceeds a human-health benchmark for drinking water. (Public domain.)
Sources/Usage
Public Domain.