Where to Obtain Edwards Aquifer Zone Maps
The officially marked Edwards Aquifer zone maps are USGS
topographic maps for individual quadrangles that contain portions of the recharge, contributing or transition zone. The last mapping change went into effect on September 1, 2005. Modifications were made to the existing boundaries in Travis, Hays, Comal, and Bexar Counties.
|Maps of quadrangles in
610 West Sunset Road
San Antonio, TX 78216
7801 N. Lamar Blvd. Suite C57
Austin, TX 78752
The marking of these zones on the official maps is based on the best current understanding of local geologic formations and water movement. These maps are adopted as part of the rules, and we may revise them through our standard rulemaking process when new information is available.