
Education & Outreach
What is the Carrizo-Wilcox aquifer?
The Carrizo-Wilcox Aquifer is a large underground water supply in Texas that provides water to over 60 counties and about 12 million homes. It stretches from the Rio Grande in south Texas to parts of Louisiana and Arkansas and is made up of sand, gravel, silt, clay, and lignite layers up to 10,000 feet thick. The aquifer is recharged by rainfall and streams that cross the outcrop.