Well Water in Uvalde County, Texas

The Edwards Aquifer Authority: a single-aquifer, eight-county regulator

The Edwards Aquifer Authority (EAA) was created by the Texas Legislature in 1993 with a specific, narrow mandate: regulate pumping from the Edwards (Balcones Fault Zone) Aquifer to benefit all of its users, across eight counties -- all of Uvalde, Medina, and Bexar Counties, plus portions of Atascosa, Caldwell, Comal, Guadalupe, and Hays Counties (CORRECTED 2026-09: an earlier version of this page listed Kinney County in place of Atascosa County, which is not part of EAA's jurisdiction). Inside Uvalde County, any well that draws from or passes through the Edwards Aquifer falls under EAA's authority, not the county's. EAA issues well-construction permits for all new construction, reconstruction, or closure of an Edwards well, aimed at preventing contamination or waste from poorly built or deteriorated wells, and it separately issues withdrawal permits governing how much water a given well can pump.

One detail that catches buyers off guard: even a small domestic well is not automatically exempt from EAA's process. Wells pumping under roughly 25,000 gallons per day for household use are generally exempt from needing a withdrawal permit, but EAA still requires every well in its jurisdiction -- exempt domestic wells included -- to be registered and to meet its construction standards. A buyer assuming a household well needs no interaction with EAA at all should confirm that directly, since registration and construction-standard compliance apply regardless of exemption status.

UCUWCD: everything else, with the Edwards specifically carved out

The Uvalde County Underground Water Conservation District (UCUWCD) is a separate, independently governed local district covering groundwater in Uvalde County -- but its jurisdiction specifically does not extend to the Edwards Aquifer, even though the Edwards physically occurs within UCUWCD's mapped boundary. A U.S. Geological Survey hydrogeologic assessment of the county states this directly: the Edwards Aquifer is excluded from UCUWCD's jurisdiction because the district lacks authority over that particular aquifer, leaving it to EAA instead. What UCUWCD does regulate is the county's other water-bearing formations -- the Trinity Aquifer, which underlies the Edwards within the district's boundary, along with the Austin Chalk, Buda Limestone, and the fluvial Leona Formation, all of which play a role in the county's genuinely complex hydrogeology.

For a well that draws from one of these non-Edwards formations, UCUWCD -- not EAA -- is the permitting authority, with its own posted district rules covering registration, spacing, and production. Because Uvalde County's geology stacks these aquifers on top of and alongside one another, the practical question for any specific well isn't just where the land sits on a map, but which formation the well is actually completed in and drawing from -- a hydrogeologic question best answered by a driller or hydrogeologist familiar with the specific area, not assumed from the parcel's general location.

A real, multi-year restriction period -- not a hypothetical risk

For anyone counting on an Edwards Aquifer well specifically, recent history is worth knowing: the EAA placed the Uvalde Pool under Stage 4 Critical Period Management -- its most restrictive tier of mandated pumping cutbacks -- continuously from mid-2022 until finally lifting the restriction on August 11, 2025. That's a documented, multi-year stretch during which Edwards Aquifer permit holders in the Uvalde Pool operated under reduced allowable pumping tied to aquifer index-well levels and spring flow requirements downstream at Comal and San Marcos Springs, not a one-time drought blip. A buyer relying on full permitted volume from an Edwards well for irrigation or another water-intensive use should ask EAA directly about the aquifer's current management stage and what percentage cutback applies at each stage, since a stretch like 2022-2025 shows this is a real, recurring operating condition rather than a remote possibility.