Texas
Buying Land in Karnes County, Texas
Karnes County -- Karnes City and Kenedy, in the heart of the Eagle Ford Shale -- produces more oil than any other county in the play, and that scale of drilling has left a genuinely dense layer of wells, pipelines, and surface-use agreements across the county's rural land. Groundwater here runs through a district shared with three neighboring counties, and the county administers its own septic permitting.
Karnes City, Kenedy, and a county built around the shale boom
Karnes City (the county seat) and Kenedy anchor Karnes County, and both towns' retail base transformed visibly during the Eagle Ford Shale boom -- local economic development officials have described the growth in blunt terms, noting Kenedy's retail base still consists largely of a Walmart, an H-E-B, and a Tractor Supply even after the boom years, with room for more. Population figures for the county have been genuinely difficult to pin down precisely because Census Bureau estimates don't fully account for the transient oilfield workforce living in man camps and extended-stay motels during peak drilling periods -- worth remembering if you're using population data alone to judge how developed or rural a specific area feels today.
An oil-and-gas density unlike almost anywhere else in Texas
The numbers behind Karnes County's Eagle Ford Shale activity are genuinely extreme relative to other Texas counties: the county leads the entire play in oil production, at roughly 176,000 barrels per day from nearly 1,500 wells as of the most recent figures found in this research, and its tax base grew from $513 million to $7.1 billion over a four-year boom period. In that same window, more than 1,200 drilling permits were approved and roughly 2,000 miles of new pipeline were laid across the county -- a scale of subsurface and surface infrastructure that makes it a near-certainty, not a possibility, that a given rural Karnes County parcel sits near an active or plugged well, a pipeline right-of-way, or both. See our standalone page on easements in Karnes County for what that density means specifically for surface-use agreements, pipeline right-of-way negotiation, and what to check on title before closing.
Groundwater: a district joined by a documented 1998 vote
All of Karnes County falls under the Evergreen Underground Water Conservation District (EUWCD), which the county formally joined through a two-step, well-documented local process: the Karnes County Commissioners Court petitioned the district for annexation in September 1997, and voters in the county ratified that petition by an 89% margin in a January 1998 election -- a more specific paper trail than most Texas counties' groundwater-district histories offer. EUWCD also covers Atascosa, Frio, and Wilson Counties and manages groundwater from both the Carrizo-Wilcox Aquifer (spanning Frio, Atascosa, Wilson, and parts of Karnes) and the Gulf Coast Aquifer System present within Karnes. Given the intensity of oil-and-gas activity in the county, it's also worth asking EUWCD directly whether any wells near active drilling operations face heightened monitoring or different permitting scrutiny. Confirm current permitting rules, fees, and any exemption thresholds directly with EUWCD ((830) 569-4186) before drilling.
Septic permitting: run directly by the county
Karnes County has no general zoning ordinance for its unincorporated area, consistent with the statewide default, and administers on-site sewage facility (OSSF) permitting through its own Special Projects Office rather than referring applicants to a TCEQ regional office -- the county's own paperwork specifically labels the resulting document a "TCEQ-Karnes County" OSSF permit, evidence of a direct local review role. Planning materials for a proposed OSSF must be obtained from the Special Projects Office before a permit application can move forward. Confirm current fees, the county's formal TCEQ authorized-agent status, and required site/soil evaluation steps directly with the Special Projects Office before budgeting a septic system.
Who to Call Before Buying Land in Karnes County
Karnes County has no general zoning ordinance for its unincorporated area, consistent with the statewide default. For a parcel inside Karnes City or Kenedy's limits or ETJ, contact that city directly instead of the county.
Environmental Health
Karnes County Special Projects Office
On-site sewage facility (OSSF/septic) permit applications and required planning materials for unincorporated land.
Wells / Private Water
Evergreen Underground Water Conservation District
Well registration and permitting for parcels in Karnes, Atascosa, Frio, or Wilson County.
Assessor / Property Tax
Karnes County Appraisal District
Assessed value, property tax, and agricultural (ag/wildlife) valuation questions for a specific parcel.
Recorder / Clerk / Land Records
Karnes County Clerk
Recorded deed, oil-and-gas lease, mineral deed, pipeline easement, and plat history for a specific parcel.
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Get local guidanceTopics Specific to Karnes County
Sources
- Shale of the Century: Small Towns Dazed by Eagle Ford Influx — Texas Real Estate Research Center, Texas A&M University (accessed 2026-09)
- Top Oil-Producing Counties in the Eagle Ford Basin (2025 Update) — Novi Labs (accessed 2026-09)
- Eagle Ford Shale | Karnes County, TX — Eagle Ford Shale Play (accessed 2026-09)
- Evergreen Underground Water Conservation District Groundwater Management Plan — Evergreen Underground Water Conservation District / UT Bureau of Economic Geology (accessed 2026-09)
- Evergreen Underground Water Conservation District — Evergreen Underground Water Conservation District (accessed 2026-09)
- OSSF Application — Karnes County, Texas Government (accessed 2026-09)
- Karnes County Appraisal District — Karnes County Appraisal District (accessed 2026-09)
Last reviewed 2026-09