Dreaming about a custom home, horses, or room to spread out in College Grove and the nearby hills? Acreage can open up exciting possibilities, but it also comes with questions that do not always show up on a typical neighborhood home search. If you are considering land in this part of Williamson County, it helps to know how zoning, access, septic, utilities, and topography can shape what is actually possible on a specific tract. Let’s dive in.

Why acreage here is different

College Grove and Arrington are not just larger-lot versions of suburban neighborhoods. Williamson County identifies both as village areas with limited infrastructure, historical character, and ongoing development pressure through its Special Area Plans.

That matters because acreage value here is tied to more than the number of acres on paper. A tract may look ideal at first glance, but floodplain, steep slopes, mature woodlands, soil conditions, and access can all affect where and whether you can build.

In the county’s adopted village plans, College Grove is described as a rural-serving area in southeastern Williamson County, and the county notes that land east of Horton Highway includes floodplain, mature woodlands, and slopes greater than 15%. The Arrington plan also notes 100-year floodplain south of Murfreesboro Road, along with pockets of steep slopes greater than 15%, according to the College Grove and Arrington planning documents.

Start with zoning and subdivision type

Before you picture a homesite, barn, guest structure, or future split, confirm the parcel’s zoning and subdivision status. Williamson County’s zoning information makes clear that parcel-specific confirmation matters, especially since the Planning Commission reviews rezonings, special use permits, zoning amendments, and site or plat approvals.

For land buyers, one of the biggest distinctions is how the parcel was created. The county’s subdivision rules recognize agricultural subdivisions and large-lot major subdivisions, and those categories can affect density, access, and approval requirements.

For example, large-lot major subdivisions on private driveways can have no more than five lots using exclusive access from that driveway. The regulations also require a minimum 50-foot easement width and septic and water approvals shown on the plat, based on the county’s subdivision regulations.

Why zoning is only the first step

Zoning can tell you the broad framework, but it does not guarantee that every part of the land is usable in the way you expect. You still need to match the zoning with site conditions, septic feasibility, legal access, and any resource-protection standards that apply.

That is why acreage purchases often require a more detailed review than a standard home purchase. A beautiful tract can still have a smaller practical build envelope than you assumed.

Access can make or break a tract

Acreage buyers often focus on road frontage and privacy, but legal access is just as important as the view. Williamson County states that no building permit can be issued unless the access road has legal public-road status or the lot fronts on a compliant permanent easement, according to the county’s Zoning Update FAQ.

If the property fronts a county road, the county highway department approves driveway locations. If it connects to a state route, driveway approval falls under TDOT, and the state says a permit is required before construction or modification of a driveway on state highway right-of-way.

Private driveways also come with practical considerations. Under the county’s subdivision rules, a private driveway is not a public road, and the county is not responsible for maintaining it. That may affect long-term upkeep, shared access expectations, and the cost of future improvements.

Questions to ask about access

When you are evaluating acreage, ask:

• Does the parcel have legal road frontage or a compliant easement?
• Is the current driveway permitted and properly located?
• If the driveway touches a state route, has TDOT approval been addressed?
• If access is private, who maintains it and under what agreement?

Septic and utilities deserve early attention

In rural and semi-rural areas, water and sewer are often the biggest wildcards. The College Grove Village plan states that the area is served by the Nolensville/College Grove Utility District, but sufficient capacity does not currently exist to serve appreciable new development. The same plan also states that sewer service beyond traditional septic systems is currently not available in the village and that septic use is limited on many properties due to unsuitable soils, as outlined in the county planning document.

The Nolensville/College Grove Utility District confirms that it provides water service, but that does not mean every tract has simple, immediate utility access. In land purchases, “served by the district” and “ready to connect at this exact parcel” are not always the same thing.

Arrington has similar constraints. The county’s adopted Arrington plan says the village is served by the Milcrofton Utility District for water and fire flow, but municipal sewer service is not currently available, and many properties are limited by unsuitable septic soils, according to the Arrington village plan.

Why septic testing matters

If you are buying acreage for a custom home, a family compound, or a hobby-farm setup, do not assume a likely build site will support septic just because the parcel is large. In many cases, soil suitability is the real gatekeeper.

Williamson County’s Sewage Disposal office is the local authority for onsite systems, and the county notes that septic regulation amendments were adopted on March 17, 2026. The county also indicates that additional changes may follow, which makes current verification especially important.

Electric service is commonly available through Middle Tennessee Electric, which serves Williamson County and specifically lists the East of I-65 and Nolensville-College Grove area in its inspection guidance. Even so, service availability, line extension needs, and build costs can vary by tract.

Hillsides need a closer look

In College Grove and nearby hills, topography can shape everything from construction cost to driveway design. A parcel may have a scenic ridgeline or wooded slopes, but steep terrain can reduce the amount of practical, buildable land.

Williamson County’s zoning ordinance includes resource-protection standards tied to steep topography, hilltops, ridgetops, and special flood hazard areas. The county’s geologic hazards information also warns that sinkholes and landslides can occur, with landslides more likely on steep slopes and after heavy rainfall.

This is one reason parcel maps alone rarely tell the whole story. You want to know not just how much land there is, but how much of it may realistically support your intended use.

Watch for floodplain too

Floodplain can affect site planning, insurance considerations, and where improvements may go. In College Grove, the county notes concentrations of floodplain east of Horton Highway. In Arrington, the county notes that land south of Murfreesboro Road lies within the 100-year floodplain in parts of the village planning area, according to the same county village planning documents.

If you are thinking about a home, barn, pasture layout, or future outbuildings, floodplain and slope review should happen early. It is much easier to evaluate a tract clearly than to discover limitations after closing.

Acreage for horses or hobby farming

Many buyers are drawn to this area for a more rural lifestyle. If you are considering horses or a hobby farm, Williamson County’s ordinance definitions are helpful because they distinguish between broader agricultural uses and private stables that are incidental to a residential use.

The ordinance defines agricultural uses to include farms with livestock, horses, poultry, and dairy cattle. It also separately defines private stables and recognizes equestrian development that can include horse trails and facilities where horses or other animals may be stabled on each lot, based on the county’s zoning ordinance definitions.

That does not mean every acreage tract is a fit for every rural use. You still need to confirm zoning, access, terrain, water, and septic realities on the specific parcel.

Greenbelt may matter for long-term ownership

If you are buying land for farming, timber, open space, or long-term holding, Williamson County’s Greenbelt Program is worth understanding. The county describes Greenbelt as use-value taxation for qualifying agricultural, forest, or open-space land.

According to the county’s Greenbelt Program page, agricultural land generally must be at least 15 acres and actively used for farming, while open-space land has a 3-acre minimum. Applications are due by March 15, and rollback tax can apply if the property stops qualifying.

For some buyers, Greenbelt can be part of the ownership strategy. It is not automatic, though, so it is smart to review eligibility and timing before relying on it in your budget planning.

A smart acreage checklist

Buying acreage in College Grove and nearby hills is often less about finding the biggest tract and more about finding the right tract. A parcel-specific review can help you avoid expensive surprises and move forward with more confidence.

Here is a practical checklist to use early in your search:

• Confirm the zoning district and review the official county zoning map
• Verify how the tract was subdivided and whether any plat conditions apply
• Confirm legal access, road frontage, or easement compliance
• Check whether driveway approvals are needed from the county or TDOT
• Investigate water availability to the specific parcel
• Evaluate septic feasibility before assuming a homesite location
• Review floodplain, steep slopes, and other terrain constraints
• Clarify whether your intended use fits the parcel and zoning framework
• Ask about utility extension costs, maintenance responsibilities, and timing

Work with local guidance that goes beyond the listing

Acreage purchases reward careful due diligence. In College Grove and the surrounding hills, the right opportunity is usually the one that balances beauty, buildability, access, and long-term fit with your goals.

If you want help evaluating land, comparing parcel tradeoffs, or understanding how a tract fits your plans, Sarah Nicodemus offers local, high-touch guidance rooted in Williamson County expertise. Whether you are searching for a homesite, horse property, or long-term land investment, you deserve a clear strategy from the start.

FAQs

What should you check before buying acreage in College Grove?

• You should confirm zoning, subdivision status, legal access, driveway approvals, septic feasibility, water availability, and floodplain or steep-slope constraints before making assumptions about what can be built.

Is sewer available for acreage in College Grove, Tennessee?

• In the county’s College Grove village planning documents, sewer service beyond traditional septic systems is not currently available in the village area, so many buyers need to focus on septic feasibility.

Can you build on any large parcel in Williamson County?

• Not always. Buildability can depend on zoning, legal access, septic approval, floodplain, steep slopes, and other site-specific conditions.

Are horses allowed on acreage in College Grove and nearby hills?

• Williamson County’s ordinance definitions include agricultural uses with horses and also define private stables, but allowed use should still be confirmed for the specific parcel and zoning context.

Why is septic such a big issue for land in College Grove and Arrington?

• The county’s planning documents state that many properties in these village areas have unsuitable soils, which can limit where onsite septic systems can be approved.

Can Greenbelt reduce taxes on Williamson County land?

• Williamson County says qualifying agricultural, forest, or open-space land may be eligible for Greenbelt use-value taxation, subject to acreage, use, application deadlines, and ongoing qualification rules.