USGS National Water Quality Network sites in the United States
![Map of current USGS National Water Quality Network sites in the United States](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/NWQN_2016_v2.png?itok=ypQCuMkg)
Detailed Description
The USGS National Water Quality Network monitors the status and trends of the Nation’s surface-water quality at more than 100 sites across the United States.
The USGS National Water Quality Network monitors the status and trends of the Nation’s surface-water quality at more than 100 sites across the United States.