Smith County, TN Contractor directory
Excavation contractors in Smith County, TN
12 verified excavating and site work contractors serving Smith County.
County excavation guide
Ground conditions and project requirements in Smith County
Use this local research to understand soil, seasonal constraints, permits, and jobsite logistics before choosing a contractor.
Skip to 12 contractorsSoil Regime ProfileEPA Ecoregion 71, 68, 30 (Interior Plateau, Southwestern Appalachians, Edwards Plateau)
Karst Limestone & Dissolution Valley
Dominant Soil Order: Alfisols / Inceptisols / Mollisols
Parent Material: Ordovician & Mississippian Bedded Limestone, Dolomite & Cherty Residuum
Karst limestone terrain presents extreme subsurface variability due to millions of years of chemical dissolution in carbonate bedrock. Pinnacle limestone formations produce erratic bedrock depths where solid rock may sit at grade on one corner of a footing and 12 feet deep on another. Hydraulic rock breakers, rippers, or controlled blasting are standard requirements for basement excavation, utility trenches, and retention basins. Hidden subsurface dissolution voids, caves, and active sinkholes pose constant settlement hazards. Excavators must adhere to strict environmental buffer setbacks from mapped sinkhole throats to protect regional groundwater aquifers. Excavated clay residuum often contains heavy concentrations of abrasive chert cobbles, accelerating tooth and blade wear. Soil evaluation tests must verify bearing stability before structural loading.
Geographic Footprint:Middle Tennessee (Davidson, Rutherford, Williamson), Northern Alabama (Madison, Limestone), Texas Hill Country (Bexar, Comal)
Geotechnical Baseline
Physical Ground Conditions & Soil Properties
Shallow Bedrock (<50 in)
35.4%of county land area
High likelihood of bedrock refusal; hammer / ripper required for deep utilities.
High Shrink-Swell Clay
25.0%expansive soil
Moderate shrink-swell; verify plasticity index on structural fill.
Median Water Table Depth
15inches from surface
Shallow water table; active dewatering or sumps needed for deep trenching.
Hydric / Wetland Soils
0.2%hydric coverage
Indicates poor natural drainage and potential jurisdictional wetland pockets.
Steep Terrain (Slope >15%)
65.8%of terrain
Mountain/hilly terrain; terracing, benching, and tracked haulers frequent.
Septic Severe Limitations
92.5%severe rate
High rate of conventional drainfield limitations; engineered or drip systems often required.
Dominant Soil Textures:Silt loamSilty clay loamLoam
Surface Stones / Boulders: 19.5% coverage
Compliance & Permitting
Earthwork Regulations & Permit Thresholds
Stormwater & Erosion Control
TDEC NPDES Construction General Permit TNR100000 (1+ acre disturbance); SWPPP and NOI required before clearing
Administers NPDES stormwater discharge coverage for land-disturbing construction activities.
State Threshold:1.00 Acre
Local Threshold:Follows state
Grading Permit: Required locally
Onsite Wastewater & Utilities
TDEC Division of Water Resources , Smith County Environmental Field Office
Jurisdiction over septic tank permits, soil evaluation perk tests, and drainfield sizing.
Housing on Septic:55.0%
Soil Evaluation:Site evaluation by TDEC-approved soil consultant (soil profile + morphology per Rule 0400-48-01); perc tests not accepted
811 One-Call Requirements
Tennessee 811
Mandatory notice window: 72 hours prior to mechanized earthwork (excluding weekends and legal holidays).
Licensing & Clearing Permits
Contractor License Threshold: Required for earthwork contracts exceeding $50,000 in Tennessee.
Burn Permit Season: Free burn permit required Oct 15 – May 15 statewide; check daily permit status by phone or BurnSafeTN.orgAuthority: Tennessee Department of Agriculture Division of Forestry (BurnSafeTN.org); TDEC open-burning rules also apply
Weather & Ecology
Seasonal Constraints & Clearing Windows
Design Frost Depth
12inches
Building code minimum depth for footing frost protection.
Frozen Ground Days
0days / year
Typical days with sub-freezing soil conditions affecting digging.
Supply Chain & Hazards
Logistics, Aggregate Sources & Geohazards
Aggregate & Material Supply
Gordonsville Plant
Nearest active quarry: 4.4 miles haul distance.(23 active crushed stone/sand operations within 50 miles).
Flood & Hazard Overlay
FEMA 100-Yr Flood:12.3%(100% NFHL digital map coverage)
NWI Wetlands:7.1%jurisdictional coverage
Karst Terrain & Sinkhole Risk: Present
92.1% of county underlain by soluble carbonate rock formations.
HUC8 Primary Watersheds:Upper Cumberland-Cordell Hull Reservoir, Caney, Lower Cumberland-Old Hickory Lake
Public conservation land: -0.8% (USGS PAD-US).
Area-specific FAQ
Do I need to call before digging in Smith County?
Yes. You should contact Tennessee 811 at least 2 working days before any digging so underground lines can be marked.
How deep do footings need to be in Tennessee?
In Tennessee, footings typically need to extend below the frost line, which is around 12 inches here. A local contractor will confirm the code requirement for your site.
Verified local listings
Excavation contractors serving Smith County
12 verified listings
Thorne's Excavating Co
erosion control, excavation, foundations, grading, site prep, trenching underground
63 years in business
Lone Wolf Equipment Operations
Watertown, TNSmith County
driveways, excavation, grading, hauling trucking, land clearing, pond water management
GFL grading and skid steer work
driveways, erosion control, excavation, grading, land clearing, pond water management
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