Maps & GIS -Edwards Aquifer Authority
Maps & GIS -
Maps & GIS
Edwards Aquifer Maps and GIS Library
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.
Featured Maps
Edwards Aquifer Recharge Zone
Where is it?
EAA Rule 713 Subchapters E, F, G, & H
Regulated Zones
Groundwater Conservation Districts
EAA and Surrounding
EAA Districts
What EAA District Are You in?
Gauging Site System
Continuous Data Collection
EAA Weather Stations
Continuous Data Collection
Karst Connections
A Virtual Field Experience
Habitat Conservation Plan
HCP
Comal Springs
Monitoring Map
San Marcos Springs
Monitoring Map
Index Wells and Springs
Recharge Zones
PDF Maps
Edwards Aquifer System Map
Letter Size
Wall Map
PowerPoint Slide
General Aquifer Flowpath Map
Wall Map
Shapefiles
Aquifer Zones
View Web Map and Map My Location
EAA Sub-chapter 713 Regulated Zones
PDF Files
Chapter 713 Edwards Aquifer System Map
Letter Size
Wall Map
PowerPoint Slide
Subchapter E: Spill Reporting and Subchapter F: Regulated Substances Registration, Storage, and Planning
Letter Size
Wall Map
PowerPoint Slide
Subchapter G: Aboveground and Underground Storage Tanks
Letter Size
Wall Map
PowerPoint Slide
Subchapter H: Prohibitions on Coal Tar
Letter Size
Wall Map
PowerPoint Slide
Shape Files
Aquifer Zones
H_RegulatedArea_CoalTar
EFG_RegulatedAreas_SpillsSubstancesTanks
View Web Map & Map My Location
EAA and Surrounding Groundwater Conservation Districts
Shape Files
BSEACD with Annex Area
HTGCD
PCCD
View Web Map & Map My Location
EAA Sub-chapter 713 Regulated Zones
PDF Files
District 01
Wall Map
District 02
Wall Map
District 03
Wall Map
District 04
Wall Map
District 05
Wall Map
District 06
Wall Map
District 07
Wall Map
District 08
Wall Map
District 09
Wall Map
District 10
Wall Map
District 11
Wall Map
District 12
Wall Map
District 13
Wall Map
District 14
Wall Map
District 15
Wall Map
EAA Director Districts
Wall Map
Shape Files
EAADirectorDistricts
EAADistrictPrecincts2023
View Mapping App & Map My Location
Shape Files
Gauging Site System
View Web Map and Map My Location
EAA Weather Stations Map
Shape Files
EAAWeatherStations
View Map & Access Data
Karst Connections: A Virtual Field Experience
Experience Karst Connections
Habitat Conservation Plan (HCP)
PDF Files
Comal HCP Final Sample Locations
Wall Map
San Marcos HCP Final Sample Locations
Wall Map
Comal Springs Monitoring Maps
Monitoring Map
Comal Springs Monitoring Maps
View Map
San Marcos Springs Monitoring Map
Monitoring Maps
San Marcos Springs Monitoring Maps
View Map
Shape Files
IndexSprings
IndexWells
View Index Wells and Springs
More Maps & GIS
Regulatory Zone Maps
Shapefiles
Service Level Agreement – GIS
Calibrated Rain Maps
ArcGIS Online
CURRENT AQUIFER CONDITIONS
San Antonio Pool
40% CURRENT REDUCTION
Uvalde Pool
44% CURRENT REDUCTION
Critical Period/Drought Management
San Antonio (J17WL)
630.8
10 DAY AVERAGE
636.4
TODAY
636.1
YESTERDAY
Uvalde (J27WL)
834.0
10 DAY AVERAGE
834.1
TODAY
834.1
YESTERDAY
Comal
76
10 DAY AVERAGE
91
TODAY
91
YESTERDAY
San Marcos
81
10 DAY AVERAGE
85
TODAY
86
YESTERDAY
10-Year Annual Recharge Average (2013-2022) 553,230 acre-feet
Understanding the reading
Display our readings on your website
Provisional Daily Water Readings as of 09:01:25 AM,
April 24, 2026
CURRENT
AQUIFER
CONDITIONS
TODAY'S READINGS
UVALDE
J-27
834.1
FT. AMSL
Index Well
UVALDE POOL
Bexar
J-17
636.4
FT. AMSL
Index Well
Comal
Springs
91
CFS
Springflow
San Marcos
Springs
85
CFS
Springflow
SAN ANTONIO POOL
10 DAY AVERAGE
J-27 Well
834 FT. AMSL
J-17 Well
630.8 FT. AMSL
Comal Springs
76 CFS
San Marcos Springs
81 CFS
FT AMSL = feet above mean sea level
CFS: cubic feet per second
Uvalde Pool is in Stage 5: 44% reduction
San Antonio Pool is in Stage 4: 40% reduction
Understanding the levels, springflows, stages and reductions
CURRENT & HISTORIC AQUIFER CONDITIONS
This calculator is only available December 31st - January 31st. Please check back on December 31, 2025, to calculate your reductions for the year.
2025-EAA-CPM-Uvalde-Pool-rev
2025-EAA-CPM-San-Antonio-Pool-06-10-25
Online Payments
As part of a comprehensive effort to streamline processes for our permit holders and the regulated community, the EAA now offers an online payment program that allows individuals and business entities to pay for their transactions by credit card (American Express, Discover, MasterCard, or VISA) or by electronic check.
The payment site is operated and maintained by a secure, third party, payment processor. A convenience fee of 2.75% applies to all credit card transactions (a $2 minimum fee) and a $2.00 fee applies to e-check transactions. The EAA does not keep any portion of these convenience fees. After confirmation of payment, the EAA will coordinate internally to ensure your payment is posted to the correct account. This process may take up to 72 hours.
Proceed to Online Payments
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