Water Wells
Callahan County has no groundwater conservation district
If your land in Callahan County relies on a water well, there is no local groundwater district to regulate pumping — the state's rule of capture applies.
Texas has 98 groundwater conservation districts (GCDs). These local agencies regulate water wells in their areas. As of the most recent available maps, no groundwater conservation district appears to cover Callahan County. If that is the case, the rule of capture applies. Under that rule, a landowner can generally pump groundwater from their land without a permit. Your neighbors can do the same.
The rule of capture may sound good for well owners. But it also means a large pump on a neighboring property can legally draw down the same aquifer you depend on. No local district can stop that pumping. If you are buying rural land and plan to use a well, confirm current district coverage with TCEQ or TWDB, and have a licensed water well driller check the aquifer before you close on the sale. The Texas Water Development Board (TWDB) has general guidance on private wells and aquifer conditions in the state.
Source to confirm: TCEQ — Groundwater Regulation for Private Well Owners