Well Water in Medina County, Texas: Two Regulators, One Well

Two regulators, one well: what "dual jurisdiction" actually requires

The Texas hub describes roughly a hundred Chapter 36 groundwater conservation districts covering parts of the state, each with its own board and rules. Medina County has one of those -- the Medina County Groundwater Conservation District -- but it also sits entirely inside the Edwards Aquifer Authority's (EAA) jurisdiction, the special-law regional regulator created specifically to manage the Balcones Fault Zone Edwards Aquifer across eight counties. These are not redundant copies of the same rule: EAA's own program materials specifically confirm that a well drawing from the Edwards Aquifer in Medina County must be registered with the Medina County GCD in addition to whatever registration or permitting EAA itself requires. In practice, that means two separate applications, two separate fee schedules, and two separate offices to keep informed if anything about the well changes -- a genuinely heavier administrative load than a single-district Texas county carries.

Exempt wells: the same 25,000-gallon line, checked twice

Both regulators recognize an exempt well -- one used at a home or ranch for domestic or livestock purposes, capped at up to 25,000 gallons per day, that can be drilled and operated without a full withdrawal permit or fee. That threshold matches the general exempt-well concept used across most of Texas. What changes in Medina County is that qualifying as exempt under one regulator does not automatically satisfy the other: the well still needs to be registered with the Medina County GCD, which charges a $250 well-application fee for a new well construction application. If an existing registered exempt well is later converted to a non-exempt use -- larger-scale irrigation, for instance -- the district credits any previously paid registration fee against the new construction application fee rather than charging the full amount twice, but the conversion itself still requires a new application and district approval.

Before buying land with an existing well in Medina County, ask for documentation that the well is registered with both the Medina County GCD and, if it draws from the Edwards Aquifer specifically, with the EAA as well. An unregistered well -- even a small domestic one that would otherwise qualify as exempt -- is a compliance gap worth catching and resolving before closing, since an unregistered status can complicate a later attempt to sell, expand, or convert the well's use.

Non-exempt permits: the Edwards Aquifer is capped, and existing users come first

The bigger practical constraint sits above exempt-well registration: the Edwards Aquifer Authority Act imposes aquifer-wide limits on total withdrawals by non-exempt wells across the entire eight-county Edwards Aquifer region, and the Authority allocates that capped total among permit holders. The enabling legislation gave existing water users statutory preference in that allocation, which is exactly why a brand-new non-exempt Edwards Aquifer withdrawal permit is a genuinely difficult thing to obtain today -- the aquifer-wide pool is effectively spoken for, and a new large-scale irrigation or commercial water need is far more likely to be met by acquiring an existing permitted right (where the market allows) than by applying for a fresh one. This is a meaningfully different situation from most rural Texas groundwater districts, where a new non-exempt permit is mostly a matter of paperwork and a spacing check rather than a scarce, largely allocated resource.

For a buyer planning any water use beyond a single household or livestock well -- irrigated cropland, a larger operation, a subdivision with shared water infrastructure -- this is worth confirming early, before the rest of a deal is negotiated. Ask the Edwards Aquifer Authority directly whether the specific parcel already carries an existing, transferable non-exempt permit, what its currently authorized withdrawal volume is, and what it would actually take to secure additional non-exempt capacity if the current allocation isn't enough for the planned use. Layer that on top of confirming the Medina County GCD's own separate registration and any county-level rules, since satisfying one regulator here does not mean the other is automatically satisfied too.