Buying Land in Fannin County, Texas

Lake zoning: the exception, not the rule, and it's real here

Most of this site's Texas coverage exists to explain that Texas counties generally can't zone. Fannin County is one of the places where that generalization breaks down. Its Commissioners Court has adopted Lake Zoning Regulations under Local Government Code Chapter 231, applying to the unincorporated area within 5,000 feet of the shoreline of Lake Bonham, Lake Ralph Hall, and the Lower Bois d'Arc Creek Reservoir -- a large new reservoir built by the North Texas Municipal Water District that only began filling in the early 2020s -- plus, by the ordinance's own terms, any other lake built in the county in the future. Under these regulations the Commissioners Court can regulate building height, size, and the location and use of structures for residential, business, or industrial purposes within the zoned strip, functions ordinarily reserved to incorporated cities elsewhere in Texas.

The two newer lakes each got their own dedicated process: the Lake Ralph Hall Zoning Commission's maps and regulations, tied specifically to Local Government Code Section 231.132 and referencing the lake's shoreline elevation of 551 feet above mean sea level, were approved by Commissioners Court on February 7, 2023 (notably, without authorizing a lake-operations zone at that time). The Bois d'Arc Lake Zoning Commission's own rules require a Lake Area Development (Building) Permit for any new structure over 1,000 square feet, layered on top of a separate Shoreline Lease and Use Agreement permit that the North Texas Municipal Water District's own Lake Operations Center controls for any dock-capable shoreline lot. A buyer looking at land near any of these three lakes should treat the county's zoning classification, not just its general subdivision rules, as the first thing to check -- see the standalone zoning page for the application process and permit thresholds.

Groundwater: a real district with numeric thresholds

Fannin County sits inside the Red River Groundwater Conservation District, created by the 2009 Texas Legislature to cover Grayson and Fannin Counties together. Unlike the rule-of-capture default that applies where no district exists, this one requires registration and a Notice to Proceed for new wells, and a full District permit -- reviewed against the District's own rules -- for any well expected to produce 17.36 gallons per minute or more. Larger aggregate systems (roughly 200 gpm or more) trigger a Hydrogeological Report requirement, and non-exempt wells file production reports on a quarterly cycle with fees due within 60 days of quarter-end. Pre-2012 domestic and livestock wells under about 27.7 gpm are generally grandfathered as exempt. None of these figures should be treated as permanent; confirm the District's current rules before drilling or buying land on the strength of an existing well's stated capacity.

Subdivision rules and RV park regulations: two distinct, dated ordinances

Outside the lake-zoning strips, Fannin County's general land-use control runs through its Subdivision Regulations, amended as recently as September 17, 2024 -- current enough to reflect the county's active attention to platting standards rather than a decades-stale document. The regulations set a one-acre minimum lot size where a lot relies on an individual OSSF alone, rising to two acres where the lot also depends on a private well rather than a public water supply, plus 50-foot highway setbacks and 25-foot setbacks from other roads. Separately, and worth knowing about specifically if an RV park or campground is the goal, Fannin County adopted a standalone Recreational Vehicle Park Regulations ordinance on November 14, 2023 (amended January 23, 2024) with its own application and review process through the county's Development Services office -- covered in full on the standalone RV-campgrounds page below rather than repeated here.

Septic permitting: likely TCEQ Region 4, not independently confirmed

Fannin County falls within TCEQ's Region 4 (Dallas/Fort Worth) service area. Third-party septic-industry reporting states that OSSF permit applications for Fannin County route through that regional office rather than a county department, but this research could not verify that claim directly against TCEQ's own authorized-agent list, so it's presented here as a lead to confirm, not a settled fact. Ask the county directly whether it holds TCEQ authorized-agent status before assuming either way.