The Edwards Challenge
The Edwards Aquifer is over-pumped. Current permitted withdrawals exceed sustainable yield during drought conditions.
Current Situation:
| Metric | Value |
|---|---|
| Permitted pumping | ~570,000 AF/year |
| Sustainable yield (drought) | ~350,000 AF/year |
| Shortfall during drought | 200,000+ AF/year |
The Edwards Aquifer is the primary water source for over 2 million people in the San Antonio and Austin regions. During drought, pumping restrictions trigger automatically—but even then, the aquifer faces stress.
The Stakes
- Comal Springs and San Marcos Springs support endangered species (fountain darter, Texas blind salamander)
- Current restrictions limit San Antonio regional growth
- Spring restoration supports a tourism economy worth $200M+/year in New Braunfels and San Marcos
Current Constraints
Regulatory Framework
The Edwards Aquifer Authority (EAA) manages pumping through a permit system:
| J-17 Index Well Level | Stage | Action |
|---|---|---|
| 660 ft | Stage 1 | 20% reduction required |
| 650 ft | Stage 2 | 30% reduction required |
| 640 ft | Stage 3 | 35% reduction required |
| 630 ft | Stage 4 | 40% reduction (critical) |
2011 drought brought levels to 628 ft—near Stage 4 emergency.
Without the Backbone
- Fight over permit reductions continues
- Agricultural vs. municipal conflict intensifies
- Legal battles extend indefinitely
- Springs remain at risk
- Endangered Species Act pressure increases
The Backbone Solution
The Backbone fundamentally changes the equation by providing an alternative supply that allows voluntary pumping reductions.
How It Works
- SAWS and other Edwards users gain access to Backbone water
- Voluntary pumping reduction becomes economically viable
- Aquifer recovers as pressure decreases
- Spring flows restored to sustainable levels
- ESA pressure relieved through improved habitat
Recovery Scenarios
| Scenario | Pumping Reduction | Backbone Replacement | Outcome |
|---|---|---|---|
| Current state | 0 | 0 | Continued stress; spring flow risk |
| Moderate recovery | 50,000 AF/year | 50,000 AF from Backbone | Partial recovery; improved spring flow |
| Full recovery | 100,000 AF/year | 100,000 AF from Backbone | Sustainable pumping; springs guaranteed |
Projected Aquifer Levels
Edwards Aquifer J-17 Index Well (feet above sea level):
| Year | Without Backbone | With Backbone |
|---|---|---|
| 2025 | 680 (current) | 680 |
| 2030 | 670 | 677 |
| 2040 | 650 | 670 |
| 2050 | 635 | 668 |
| 2070 | 620 | 665 |
Recovery Benefits
Environmental
- Springs maintained during drought conditions
- Endangered species habitat protected without economic sacrifice
- ESA compliance shifts from “at risk” to “comfortable”
- Allocation can shift toward environmental and recreational uses
Economic
- San Antonio growth enabled without water constraints
- Tourism economy protected ($200M+/year in spring-dependent recreation)
- Agricultural flexibility as municipal demand shifts to Backbone
- Reduced legal costs as regional conflicts diminish
Regional Cooperation
| Current State | With Backbone |
|---|---|
| Municipal vs. agricultural conflict | Shared alternative supply |
| Growth constrained by allocation | Growth enabled by new supply |
| Endangered species as obstacle | Environmental protection achieved |
| Zero-sum permit battles | Positive-sum cooperation |
Investment Required
Edwards Recovery Infrastructure:
| Component | Estimated Cost |
|---|---|
| San Antonio lateral from Backbone | $150M |
| Transition infrastructure | $50M |
| Total | $200M |
This investment enables the shift from Edwards pumping to Backbone supply, protecting billions in regional economic value while restoring one of Texas’s most important natural resources.
The Edwards Aquifer can recover—but only if an alternative supply exists. The Backbone provides that alternative.