Operators based within 12 miles of Big Rock

Listed by where the business is, not by who it says it serves. Every operator here holds a current state permit, and the address it is placed by comes from the state's own published list — so this is a checkable claim rather than a service-area promise. A Tennessee installer permit is valid statewide, so operators further out can work here too; these are simply the ones closest to you.

Soil and septic suitability around Big Rock

The USDA has already rated this ground for exactly one use: a septic tank absorption field. Within 4 miles of Big Rock — 32,016 acres across 61 soil map units — it rates 95.5% of the land very limited for that use and 2.8% somewhat limited, and almost none with no limitation at all.

• Very limited · 95.5%
• Somewhat limited · 2.8%
• Not rated · 1.7%

What the limitation actually is

A rating on its own tells you nothing you can act on. The reasons do, and around Big Rock the leading one is seepage, bottom layer on 47.7% of the mapped area, followed by depth to saturated zone on 46.8%. In full:

Shares overlap: most soils here are limited for more than one reason at once, so these do not sum to 98.3%.

The soils themselves

The named soils and land types that make up most of the ground around Big Rock. Bodine alone accounts for 24.9% of it.

“None in profile” means SSURGO records no bedrock or other restrictive layer within the depth it describes, not that none exists.

What that means if you are building or repairing here

Karst, and why fast soil is not good soil

Part of the ground around Big Rock is limited not because water moves too slowly but because it moves too freely: fractured limestone beneath the trench that carries effluent down to groundwater before the soil has treated it. Much of Tennessee's limestone country is karst — sinkholes, solution channels, springs — and a great many households here draw drinking water from private wells. A site that percolates beautifully can still be refused for exactly that reason, and the separation distances between a field, a sinkhole and a well are among the things a soil consultant is actually looking for.

A seasonal water table

Some of the ground around Big Rock carries a water table that rises close to the surface for part of the year and is nowhere to be seen for the rest of it. A field built into saturated soil does not treat effluent and does not drain, and the soil does not have to be wet on the day it is looked at for that to be true — the evidence is in the profile, as mottling and grey colours, which is one of the reasons the work is done by someone trained to read a soil pit rather than by timing water in a hole in August.

Steep ground

A drain field has to be close to level. Effluent is distributed along a trench by gravity or by pump, and on a grade it runs to the low end, overloads it, and surfaces there. Around Big Rock enough of the ground is steep that field placement tends to decide house placement rather than the other way round — the usable field area is often a bench or a shoulder some distance from the best building site, and the connection between them is a cost. It is worth knowing which part of a lot is the field before you fall in love with a view.

Area of interest: a 4-mile radius around the USGS Geographic Names centre point for Big Rock (GNIS 1305229, 36.5806, -87.7600), chosen because five of this state's communities are unincorporated and have no boundary to use, and because the lots that need a septic permit are in the ring around a town rather than inside it. Soil from USDA-NRCS Soil Data Access, SSURGO interpretation “ENG - Septic Tank Absorption Fields”, area-weighted by mapped acreage and by each component's share of its map unit. Survey areas: Lyon and Trigg Counties, Kentucky (2025-09-08), Stewart County, Tennessee (2025-08-29). Retrieved 2026-09-09.

This is a survey, not a soil map for your lot. A permit needs a high-intensity map of the specific parcel, produced by a TDEC-approved soil consultant — see soil map vs perc test.

Permitting in Stewart County

Septic permitting in Stewart County is administered by the State of Tennessee, not the county health department. See the Stewart County detail →