Edwards Aquifer Protection

Conserving the primary source of water for nearly 2 million Texans

The Edwards Aquifer: Water for Life

The Conservancy has helped protect nearly 100,000 acres of land above the Edwards Aquifer.

The Edwards Aquifer is one of the most important water resources in Texas. One of the largest, most prolific artesian aquifers in the world, it serves as the primary source of drinking water for nearly two million Central Texans, including every resident of San Antonio—Texas’ second largest city—and much of the surrounding Hill Country. Its waters feed springs, rivers and lakes and sustain diverse plant and animal life, including rare and endangered species. The aquifer supports agricultural, industrial and recreational activities that not only sustain Texas’ economy, but also contribute immeasurably to the culture and heritage of the Lone Star State.

The Edwards Aquifer stretches beneath 12 Texas counties and the land above it is broken into four primary regions. Two of those regions—the recharge and contributing zones—replenish the aquifer through rainwater, which seeps through fissures, cracks and sinkholes in the porous limestone that dominates the region.

As the only major metropolitan area wholly dependent on an aquifer for drinking water, San Antonio has long understood the importance of its protection. In 2000, voters approved the city’s first publically financed water fund measure to protect the Edwards Aquifer. The proposition passed with enthusiastic support and ultimately raised $45 million in water funds to purchase properties within the aquifer’s most sensitive area. Five years later, San Antonians voted to not only continue the program, but to greatly expand it. The ensuing Edwards Aquifer Protection Initiative raised an additional $90 million to protect the Edwards Aquifer in Bexar County, where San Antonio lies, and throughout much of the region. A short time later, voters renewed the initiative, raising millions more.

Since 2000, The Nature Conservancy has worked alongside the city officials in San Antonio and surrounding communities to ensure these water funds make the most impact. We have helped these local governments invest nearly $1 billion dollars in water protection funds and protect more than 100,000 acres above the Edwards Aquifer. That acreage includes 21 percent of the aquifer’s recharge zone, its most sensitive area.


Stay Updated

Learn about the places you love and find out how you can help by signing up for Nature eNews.

I'm already on the list Read our privacy policy

Thank you for joining our online community!

We'll be in touch soon with more Nature Conservancy news, updates, and exciting stories.