The Edwards Aquifer and Water Wells in Travis County

The Edwards Aquifer runs beneath parts of Travis County, especially in the western hills. It is a major drinking water source for the region. Because of this, Travis County limits how dense development can be in recharge and contributing zones. Residential lots served by individual wells must be at least 5 acres in these areas. Lots on a shared groundwater system need at least 3 acres each.

Wells may only draw from the Trinity or Edwards aquifer formations — not from Colorado River alluvium. All well plans must include GPS coordinates and meet TCEQ water quality standards. Use the TCEQ Edwards Aquifer Map Viewer to check if your property is in a protected zone.