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USGS National Water Quality Assessment Program - Data Warehouse


Instructions - Using the Map Viewer

- Click on the tool to reset the map to the initial view area.
- Click on the tool, then click on the map to recenter the map.
- Click on the tool, then click on the map to view a smaller area of the map.
- Click on the tool, then click on the map to view a larger area of the map.
- Click on the tool, then click on a study site to view the database record associated with the site. The site that you select will be highlighted (in yellow).
- Click on the tool to find and highlight (in yellow) specific sites and display their database records. You're able to search the database for all of the sites that meet your criteria. Sites that you find will be highlighted on the map and their information will be displayed within a popup window. You can click on the name of any site in the popup window and the map will recenter on the site.
- Click on the tool to clear highlighted sites.