Texas
Buying Land in Gillespie County, Texas
Gillespie County -- Fredericksburg and the heart of Texas wine country -- runs its groundwater district's permit line right through vineyard-scale irrigation, just changed how a septic application has to be sequenced against floodplain review, and floods more often, and more suddenly, than its Hill Country scenery might suggest.
Groundwater and vineyard irrigation: where the permit line actually sits
All wells in Gillespie County fall under the Hill Country Underground Water Conservation District, chartered under Texas Water Code Chapter 36. A well used solely for domestic or livestock purposes only needs to be registered with the District -- but the moment a well is used for anything else, including commercial use, irrigation, municipal supply, or public water supply, District rules require a permit obtained before drilling or operation. The detail that matters most for this particular county: District rules specifically classify landscape irrigation on more than half an acre, where that irrigation is tied to an irrigation system, as a use requiring a permit rather than a simple registration. Given how much of Gillespie County's land economy runs on vineyards and irrigated plantings, that's not an edge case -- it's a rule that reaches directly into ordinary vineyard development. Confirm current permit requirements, fees, and any spacing rules directly with HCUWCD (508 South Washington Street, Fredericksburg, 830-997-4472) before finalizing an irrigation plan.
Septic permitting: county-run, with a new floodplain-first step
Gillespie County is a TCEQ authorized agent for on-site sewage facilities, with its own Sanitation Office reviewing designs and issuing OSSF permits rather than routing through a TCEQ regional office. What changed recently is the required order of operations: effective August 1, 2025, an applicant must first submit a Development Permit Determination and Site Plan with Narrative to the County Engineer's Office to obtain a floodplain determination, and only after that can an OSSF application go to the Sanitation Office. That sequencing is a genuinely new, dated procedural requirement -- budget the extra step and the extra time into a septic-system timeline for Gillespie County land rather than assuming the older, single-office process still applies.
Subdivision, manufactured-home-community, and road rules: current and specific
As in most rural Texas counties, Gillespie County has no general zoning ordinance, but the Commissioners Court does regulate land division and manufactured-home rental communities through its Subdivision and Manufactured Home Rental Community Regulations -- adopted December 19, 2022, and amended as recently as December 23, 2024 -- and separately governs private-road standards inside platted subdivisions through Right-of-Way Regulations effective May 28, 2024 and updated again March 10, 2025. That's an unusually current and actively revised pair of ordinances for a rural Hill Country county; still, confirm the currently adopted text of both directly with the county's Engineering Department before relying on an older copy for a specific subdivision or private-road plan.
Flooding: flash-flood risk is the dominant pattern here, not a rare event
Gillespie County's own flood-history data shows a lopsided pattern: roughly 97 flash flood events recorded over the past 30 years against only about 3 general flood events -- this is fundamentally a fast, localized flash-flood county rather than one where slow river-stage flooding is the main concern. That pattern showed up again recently: flash flooding struck in June and July 2025, and in July 2026 a Pedernales River Basin flood event triggered a county disaster declaration from County Judge Daniel Jones, with more than 30 rescues -- water rescues of stranded motorists, home evacuations, and an RV park evacuation -- concentrated near Highway 16 South and Morris-Tivydale Road, about 10 miles south of Fredericksburg. The City of Fredericksburg maintains its own floodplain ordinance in good NFIP standing for land inside city limits; for unincorporated county land, the County Engineer's Office (830-307-6196) is the floodplain-determination authority. Check a specific parcel's FEMA flood-zone status and its proximity to a named creek or the Pedernales River directly before assuming Hill Country elevation alone keeps a property dry.
Wine country and short-term rentals: real economies, covered on their own pages
Gillespie County's wine-tourism economy is not a marketing gloss on a generic rural county -- Bell Mountain, the first wholly-Texas American Viticultural Area, sits entirely within Gillespie County, and the county also overlaps the larger, 70,400-acre Fredericksburg in the Texas Hill Country AVA centered on the town itself. That concentration of vineyards and tasting rooms drives real short-term-rental demand across the unincorporated county, but the City of Fredericksburg's own five-category STR ordinance -- with a homestead-exemption requirement for two of those categories and a hard 12-occupant cap -- only reaches inside city limits, not the ETJ or the rest of the county, where Gillespie's population sits far below the threshold Texas law requires before a county may regulate short-term rentals at all. See the standalone agritourism and short-term-rentals pages below for the specifics.
Who to Call Before Buying Land in Gillespie County
Gillespie County has no general zoning ordinance for its unincorporated area, consistent with the statewide default -- the planning_zoning entry above is for the City of Fredericksburg's own short-term-rental permit program, which applies only inside city limits, not the ETJ or the rest of the county. We could not confirm a direct phone number for the Gillespie County Sanitation Office, Gillespie CAD, or the County Clerk within this research's scope; use the listed websites or the county's main line to be routed correctly.
Wells / Private Water
Hill Country Underground Water Conservation District
Well registration versus permit requirements, including the half-acre irrigation-permit threshold, and well-spacing rules.
Septic / Onsite Wastewater
Gillespie County Sanitation (OSSF) Office
On-site sewage facility (septic) permits and inspections -- Gillespie County is a TCEQ authorized agent. Requires a floodplain determination from the County Engineer's Office first, effective August 1, 2025.
Floodplain / Stormwater
Gillespie County Engineer's Office
Floodplain determinations (required before an OSSF application), Development Permit Determinations, and Right-of-Way Regulations for private roads.
Subdivision & Land Development
Gillespie County Engineering Department / Commissioners Court
Subdivision and Manufactured Home Rental Community Regulations (adopted 12/19/2022, amended 12/23/2024) for unincorporated county land.
Planning & Zoning
City of Fredericksburg -- Short-Term Rental Permit Program
Confirming whether a parcel sits inside Fredericksburg city limits and, if so, the city's STR permit category and requirements. Does not apply to the ETJ or unincorporated county.
Assessor / Property Tax
Gillespie County Appraisal District
Assessed value, property tax, agricultural (ag/wildlife) valuation, and homestead-exemption records (relevant to certain STR permit categories inside Fredericksburg).
Recorder / Clerk / Land Records
Gillespie County Clerk
Recorded deed, easement, and plat history for a specific parcel.
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Sources
- Water Wells | Hill Country Underground Water Conservation District — Hill Country Underground Water Conservation District (accessed 2026-09)
- Permit Applications | Hill Country Underground Water Conservation District — Hill Country Underground Water Conservation District (accessed 2026-09)
- Sanitation (On-Site Sewage Facilities) Department | Gillespie County, TX — Gillespie County, Texas Government (accessed 2026-09)
- Engineering Department | Gillespie County, TX — Gillespie County, Texas Government (accessed 2026-09)
- Gillespie County Right-of-Way Regulations (updated 3/10/2025) — Gillespie County, Texas Government (accessed 2026-09)
- Gillespie County Subdivision Regulations (adopted 2003; superseded by 2022/2024 Subdivision and MHRC Regulations) — Gillespie County, Texas Government (accessed 2026-09)
- Gillespie County issues disaster declaration in response to flooding — KENS 5 (San Antonio) (accessed 2026-09)
- Floodplain | Fredericksburg, TX — City of Fredericksburg, Texas (accessed 2026-09)
- Short-Term Rental Permit - Frequently Asked Questions | Fredericksburg, TX — City of Fredericksburg, Texas (accessed 2026-09)
- The Eight Texas AVAs -- Size, Boundaries, Climate, etc. — Texas Wine Lover (accessed 2026-09)
- U.S. Census Bureau QuickFacts: Gillespie County, Texas — U.S. Census Bureau (accessed 2026-09)
Last reviewed 2026-09