Texas
Buying Land in Irion County, Texas
Irion County, seat Mertzon, is ranch and oil country over the Edwards-Trinity (Plateau) aquifer, with one of the smallest populations of any Texas county. It adopted brand-new subdivision and manufactured-home-community regulations in 2025, and its own groundwater district enforces a specific well-spacing rule worth understanding before you plan a well.
The 2025 Subdivision and Manufactured Home Rental Community Regulations
Irion County's Commissioners Court adopted new Subdivision and Manufactured Home Rental Community (MHRC) Regulations for the unincorporated county after a public hearing held May 13, 2025 at the Irion County Courthouse in Mertzon. The regulations replace and supersede any prior county subdivision or MHRC rules, and they explicitly govern plats, land subdivisions, and manufactured home rental communities together, stating a purpose of promoting health, safety, and orderly development and preventing "colonias or other substandard development" in the unincorporated county -- language that echoes the state's colonias-prevention framework even though Irion County is not one of the border counties that framework was originally built around. In practice, that means adequate water, sewer, septic/OSSF, drainage, and transportation infrastructure requirements now apply directly to any new subdivision plat or manufactured-home rental community proposed in the unincorporated county. See our standalone manufactured-homes page for the requirements specific to a rental-community development, as distinct from placing a single manufactured home on an individual tract.
Groundwater: a district-managed aquifer with a specific spacing rule
Irion County Water Conservation District has covered the entire county (plus a portion of Tom Green County) since its formation in 1985, overseeing an area of roughly 712,800 acres. The district's primary resource is the Edwards-Trinity (Plateau) aquifer, with the Dockum and Lipan aquifers present as minor sources in parts of the district. Rather than leading with an exempt-well production threshold the way some neighboring districts do, Irion County WCD's headline local rule is spacing and density: new wells generally must be spaced at least 660 feet apart, or limited to a density of four permitted wells per section, with exemptions available in specific circumstances. The district also runs a quarterly water-measuring program, a rainfall-monitoring program, and offers well owners in-house partial chemical and bacteriological water testing at no cost -- a genuinely useful, low-cost resource for a buyer wanting a baseline water-quality read on an existing well. Confirm current spacing rules, any exemption, and whether a specific proposed well count on a tract complies with the district's density limit before finalizing a purchase built around multiple planned wells.
Oil and gas: the Spraberry Trend and mineral-rights diligence
Irion County overlies the Spraberry Trend, one of the largest oil fields in the United States, and the county's oil and gas production remains a meaningful part of the local economy and land market -- many ranch listings here are marketed with existing mineral income or an active oil and gas lease as part of the property's value. Because Texas allows mineral rights to be severed from surface ownership, a specific tract's mineral status (whether minerals are included, previously severed, or under an existing lease with specific royalty and surface-use terms) has to be confirmed through a title search rather than assumed from how a listing is marketed. This is standard practice anywhere in Texas oil country, but it's a live, concrete issue here given the county's location squarely within an actively producing trend.
Who to Call Before Buying Land in Irion County
Irion County has no general zoning ordinance for its unincorporated area, consistent with the statewide default. This research could not confirm which office administers OSSF (septic) permitting or whether Irion County holds TCEQ authorized-agent status -- confirm directly with the County Clerk's office or TCEQ before planning a septic installation.
Subdivision & Land Development
Irion County District-County Clerk
Review and copies of the 2025 Subdivision and Manufactured Home Rental Community Regulations, and general subdivision plat filing.
Wells / Private Water
Irion County Water Conservation District
Well spacing and density-limit questions, drilling notifications, and free basic water-quality testing for existing wells.
Assessor / Property Tax
Irion County Appraisal District
Assessed value, property tax, and agricultural (ag/wildlife) valuation questions for a specific parcel.
Recorder / Clerk / Land Records
Irion County District-County Clerk
Recorded deeds, plats, mineral reservations, and easement history for a specific parcel.
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Get local guidanceTopics Specific to Irion County
Sources
- Irion County, Texas -- Proposed 2025 Subdivision/MHRC Regulations — Irion County, Texas Government (accessed 2026-09)
- Irion County, Texas: Public Hearing Notice for Subdivision/MHRC Regulations — Irion County, Texas Government (accessed 2026-09)
- Irion County Water Conservation District — Irion County Water Conservation District (accessed 2026-09)
- District Map — Irion County Water Conservation District (accessed 2026-09)
- Irion County Water Conservation District Management Plan (2008-2018) — Texas Water Development Board (accessed 2026-09)
- Irion County, TX Oil & Gas Activity — MineralAnswers.com (secondary source, cross-checked against general Spraberry Trend industry descriptions) (accessed 2026-09)
- Irion County Appraisal District — Irion County Appraisal District (accessed 2026-09)
Last reviewed 2026-09