Water Supply in South Texas: How San Antonio Is Preparing for Growth Through 2030

As population growth continues across San Antonio and the broader South Texas region, long-term water reliability has become one of the city’s most critical planning priorities. Rather than relying on a single source, San Antonio has spent decades building a diversified water system designed to support residents, businesses, and regional partners through changing conditions and sustained growth.

Much of that planning is no longer theoretical. It is reflected in active infrastructure, operational systems, conservation programs, and regional coordination efforts that are already shaping how water is sourced, stored, and managed.

At the center of this approach is diversification. While the Edwards Aquifer remains a foundational component of San Antonio’s water supply, it is no longer the sole source. San Antonio Water System manages one of the most diversified water portfolios among major U.S. cities, combining groundwater, surface water, desalination, recycled water, and long-term storage into a single integrated system. This mix reduces exposure to drought risk and allows the utility to adjust how water is used as demand and conditions change.

One of the most significant additions to that portfolio is the Vista Ridge Regional Supply Project. The pipeline delivers surface water from Burleson County to San Antonio and provides added capacity during high-demand periods and drought conditions. While the system is already operational, ongoing integration and optimization continue as SAWS balances surface water deliveries with groundwater pumping. Planning related to Vista Ridge is expected to remain active through at least 2026 as the system is fully incorporated into long-term supply strategies.

Brackish groundwater desalination is another key component of San Antonio’s water system. The H2Oaks Center, one of the largest inland desalination facilities in the nation, treats naturally saline groundwater and converts it into potable water. This source allows SAWS to reduce reliance on the Edwards Aquifer during drought periods while maintaining supply. Planned upgrades and operational refinements through 2026 are intended to improve efficiency and reliability, particularly when aquifer pumping restrictions are in place.

Supporting both groundwater and surface water supplies is the Aquifer Storage and Recovery system. ASR allows water to be stored underground during wetter periods and retrieved during times of higher demand or drought. Functioning as a large-scale reserve, the system helps stabilize supply without the need to construct new surface reservoirs. ASR is expected to remain a core element of San Antonio’s water management strategy through 2030 and beyond.

Conservation plays an equally important role in the city’s approach. San Antonio consistently ranks among U.S. cities with the lowest per-capita water use, a result of long-standing conservation policies treated as permanent infrastructure rather than temporary measures. Tiered pricing, landscape and irrigation efficiency incentives, commercial and industrial reuse programs, and public education efforts continue to reduce demand. These programs are expected to remain in place through 2026, helping limit the need for additional supply infrastructure even as the population grows.

That growth is a central factor in long-range planning. SAWS currently provides water service to more than two million people across San Antonio and surrounding service areas, including residential neighborhoods, commercial users, military installations, and regional wholesale customers. Population projections used in planning extend well beyond 2026, with regional forecasts anticipating the metropolitan area reaching approximately 2.6 to 2.8 million residents by the early 2040s. Growth is expected not only within city limits but throughout Bexar County and neighboring counties.

To account for these trends, SAWS incorporates population forecasts into its water resource planning and capital improvement programs. Demand modeling, infrastructure timing, and supply adequacy are evaluated under both normal and drought scenarios, with planning assumptions updated regularly to reflect changes in development patterns, conservation performance, and water use behavior.

 

As growth increasingly occurs outside San Antonio’s city limits, coordination beyond the city has become more important. SAWS works closely with the Edwards Aquifer Authority, which regulates groundwater withdrawals from the Edwards Aquifer, as well as groundwater conservation districts in surrounding counties, including the Bexar Met Groundwater Conservation District. Regional wholesale customers, county governments, and planning agencies are also part of this coordination, along with military installations such as Joint Base San Antonio, which depend on long-term water reliability.

These efforts extend into statewide planning through regional water planning groups operating under the Texas Water Development Board framework. Regional plans developed through this process feed into the state’s long-term water strategy, ensuring that local planning aligns with broader regional and statewide goals.

For most residents, these efforts remain largely behind the scenes. However, they directly influence water rates, conservation requirements, and system reliability. While weather patterns and drought conditions vary year to year, San Antonio’s approach emphasizes flexibility and preparedness rather than reactive measures.

Water planning in South Texas is measured in decades rather than election cycles or short-term forecasts. The systems and programs currently in place are designed to support growth through 2030 and beyond, with incremental adjustments expected as conditions evolve. For residents and businesses, understanding how water is sourced and managed provides clarity around one of the region’s most essential resources as the city continues to grow.