The Major Aquifers of the EUWCD:

• The Carrizo-Wilcox Aquifer spanning from the northern boundaries of Frio, Atascosa, and Wilson counties to the southern boundaries of the same counties. The Carrizo-Wilcox Aquifer also occurs in the north part of Karnes County.
• The Gulf Coast Aquifer System in Karnes County.

The Minor Aquifers of the EUWCD:

• The Queen City Aquifer in Frio, Atascosa, and Wilson Counties
• The Sparta Aquifer in Frio, Atascosa, and Wilson Counties
• The Yegua Jackson Aquifer in southern Atascosa and Wilson counties and Karnes County.

Click on the dots in the map to see water levels near you.

The Evergreen Underground Water Conservation District (EUWCD) operates an extensive Monitoring Well Program to track the health and availability of groundwater resources across the region. These dedicated wells allow the District to collect long-term data on water levels and aquifer conditions, which supports responsible groundwater management and planning.

Monitoring wells are strategically placed throughout the District in both major and minor aquifers. The major aquifers within the EUWCD include the Carrizo-Wilcox Aquifer, which spans Frio, Atascosa, Wilson, and parts of Karnes County, and the Gulf Coast Aquifer System, located in Karnes County. Minor aquifers include the Queen City, Sparta, and Yegua-Jackson aquifers, which provide water to local users and also serve as critical components of the region’s hydrologic system.

By collecting consistent and reliable data, EUWCD is able to evaluate trends over time, assess the impacts of pumping, support planning for drought conditions, and ensure that Desired Future Conditions (DFCs) are being met. This program also helps to inform policy decisions, permit reviews, and conservation strategies, ensuring that groundwater remains a sustainable resource for future generations.

If you are a well owner interested in participating in the program or allowing access to a well for monitoring purposes, you can learn more and apply here.