Buying Land in Travis County, Texas

One county, two very different land-buying contexts

Travis County contains the City of Austin and its dense urban core, but it also contains a substantial unincorporated Hill Country to the west and southwest, running toward Lake Travis, the Pedernales, and the Hays County line -- and it's that western, unincorporated land that most raw-land buyers researching Travis County are actually looking at. The county's own Development Services office oversees permitting, floodplain management, and subdivision review for all development outside incorporated city limits and inside the extraterritorial jurisdictions (ETJs) of cities within the county, and any proposed subdivision or non-subdivision development project requires a pre-application meeting with county staff before permit or plat applications are even submitted. That process, plus the layered water rules below, makes Travis County a meaningfully more procedurally involved county to build in than most of rural Texas -- expect more steps, not fewer, even where there's no zoning in the traditional sense.

Groundwater: a district boundary that runs through the county

Unlike a county that's either fully inside or fully outside a groundwater conservation district, Travis County genuinely splits. The Barton Springs/Edwards Aquifer Conservation District, created by the Texas Legislature in 1987, manages roughly 430 square miles across parts of Travis, Hays, and Caldwell Counties, and its authority in Travis specifically covers the segment of the Edwards Aquifer Recharge Zone south of the Colorado River -- the Barton Springs segment, roughly 155 square miles. BSEACD permits wells drawing from the Edwards and Trinity Aquifers within its boundary and works with well owners on conservation and availability. North of the Colorado River, however, no groundwater district covers Travis County, so Texas's rule of capture applies without any local permitting body -- a landowner there can generally pump what they put to beneficial use, subject only to the narrow statewide exceptions the state hub describes. Before assuming either scenario, confirm directly which side of the river (and which side of BSEACD's mapped boundary) a specific parcel falls on.

Septic and the Hill Country subdivision rules

Travis County holds TCEQ authorized-agent status and administers most OSSF (septic) permitting for unincorporated land directly, with online applications and posted fees running roughly $285-$475 for a conventional system and $475-$700 for an aerobic one as of this research. But near Lake Travis, that county process is not the whole picture: LCRA has independently regulated on-site sewage facilities within 2,000 feet of the lake since September 1971, meaning a lakeside or near-lakeside parcel needs an LCRA septic permit in addition to a Travis County development permit -- two separate agencies, two separate applications. And where a parcel falls on the TCEQ-mapped Edwards Aquifer Recharge, Transition, or Contributing Zone (found in western and southwestern Travis), TCEQ's own Edwards Aquifer Protection Program under 30 TAC Chapter 213 requires a plan review before construction can proceed, on top of whichever OSSF permitting authority otherwise applies. The standalone septic-systems page below works through which of these layers actually apply to a given part of the county.

Separately, Travis County's subdivision code (Chapter 82) was written with Hill Country water quality specifically in mind: it generally limits impervious cover to 30% of a residential subdivision lot and 45% of a commercial one (each with named alternate-standard exceptions), and requires a water-quality control plan for any project adding more than 10,000 square feet of impervious cover outside a platted subdivision. Exactly which water-quality treatment volume and best-management-practice options apply depends on whether the tract sits in one of the county's western or eastern watersheds -- worth confirming with Development Services before sizing a driveway, pad site, or barn footprint on a Hill Country tract.

Agricultural valuation under growth pressure

Given how fast land values have risen across Travis County during its growth boom, the gap between an agricultural (1-d-1) valuation and full market value on a parcel can be extreme, and that gap is exactly what a rollback tax recaptures if agricultural use stops -- typically the difference between taxes paid under the ag valuation and what would have been owed at market value for the years the rollback provision covers, plus interest. That risk isn't unique to Travis County as a matter of law, but the dollar stakes of losing an existing ag exemption are higher here than almost anywhere else in Texas simply because the market-value gap is so large. Confirm directly with the Travis Central Appraisal District what documentation is required to keep an existing exemption in place after a change of ownership, rather than assuming a seller's current valuation transfers automatically.