Edwards Aquifer Maps and GIS
Located in the heart of south central Texas, the Edwards Aquifer is the natural water resource that supports approximately 2 million of us. It is part of a much larger system that spans approximately 8,800 square miles.
The Edwards Aquifer Authority manages the San Antonio segment of the Balcones Fault Zone. This area covers all or parts of eight counties including Uvalde, Medina, Atascosa, Bexar, Comal, Guadalupe, Hays, and Caldwell Counties.
Online Mapping Tool Instructions
The following tips will assist in using the online mapping tool available by clicking on the View Web Map and Map My Location buttons below.
- Click on any feature to see a pop-up of information about it including name.
- Change the basemap from streets to aerial or topographic by clicking on ‘Basemap’ in the upper left.
- Enter places and addresses in the search bar at the upper right of the screen. (This is a global search so don't stop typing at the street, write the city too.)
- Click ‘Legend’ in the upper left to view the colors representing zones on the map.
- Click ‘Content’ in the upper left to access options such as turning on and off layers (more options appear when the user clicks the ellipsis under the layer name).
- Pan and zoom with the mouse buttons and using the + and – signs, then return to default view by clicking the house (home) symbol between the + and -.
- On GPS-enabled mobile devices, click the crosshair symbol under the – sign to zoom to current location.
- Enter places and addresses in the search bar at the upper right of the screen. (This is a global search so don't stop typing at the street, include the city too.)
- Choose the correct address to zoom there, and click add to map notes to create a placemarker. Click next to the marker to see a pop-up of information about all the intersecting features in that location.