County soil summary
Soil types in Montgomery County, Tennessee
The most widespread soils are Sengtown, Mountview and Baxter; the most common drainage class is well drained (74% of the land), and typical topsoil pH is 6.2.
- Well or moderately well drained
- 94% of land · state 85%
- Typical topsoil pH
- 6.2 slightly acidic · state 5.3
- Septic fields very limited
- 66% of land · state 82%
- Subject to flooding
- 15% of land, any frequency · state 15%
Most common soils in Montgomery County
Share of mapped land
A county is a patchwork of many soils. These 8 cover 77% of the mapped land; 40 named soil series are mapped here in all.
| Soil | Share of land | Drainage | Topsoil pH |
|---|---|---|---|
| Sengtown | 30.1% | Well drained | 6.3 |
| Mountview | 9.5% | Moderately well drained | 5.0 |
| Baxter | 8.2% | Well drained | 5.5 |
| Pembroke | 7.0% | Well drained | 5.9 |
| Dickson | 6.3% | Moderately well drained | 6.2 |
| Pickwick | 6.0% | Well drained | 5.0 |
| Arrington | 6.0% | Well drained | 6.5 |
| Brandon | 3.6% | Well drained | 5.0 |
What this means
What the soils in Montgomery County mean for gardens, lawns and septic systems
For your garden
Typical topsoil in Montgomery County is slightly acidic: pH 6.2 (most land between 5.0 and 6.5), the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 99% of the land: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (54% of the land).
94% of the land is moderately well to excessively drained, which suits most garden plants.
For your lawn and yard
Most land is in hydrologic groups B and C, where rain soaks in at a moderate pace.
For a septic system
For conventional septic absorption fields, NRCS rates 66% of the land in Montgomery County very limited, 33% somewhat limited and 0% not limited (1% not rated, such as urban land, pits or water).
Statewide, 82% of the land is very limited, so Montgomery County is less restrictive than typical.
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Flooding is mapped on 15% of the land (15% occasional, <1% frequent).
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Drainage
How long the soil stays wet
The most common drainage class is well drained (74%). 94% of the land is moderately well drained or better, compared with 85% across Tennessee.
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| Excessively drained | 0.0% | 2.0% |
| Somewhat excessively drained | 0.4% | 11.6% |
| Well drained | 73.9% | 57.1% |
| Moderately well drained | 19.3% | 14.7% |
| Somewhat poorly drained | 3.2% | 4.5% |
| Poorly drained | 2.0% | 4.2% |
| Very poorly drained | 0.0% | 0.1% |
| Not rated | 1.2% | 5.9% |
Septic absorption fields
NRCS rating for conventional drain fields
The rating looks at the soil from 24 to 60 inches deep: permeability, depth to a seasonal water table or bedrock, flooding and slope. “Very limited” means at least one feature is unfavorable enough that a conventional field is hard to make work.
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| Not limited | 0.0% | 0.1% |
| Somewhat limited | 32.8% | 12.7% |
| Very limited | 65.9% | 81.9% |
| Not rated | 1.3% | 5.3% |
Rain, runoff and water table
Hydrologic soil group, flooding, seasonal water table
Hydrologic soil group
How fast rain soaks in when the soil is already wet. Group A soaks in fastest, D slowest.
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 2.5% | 9.9% |
| B: moderate infiltration | 71.5% | 39.3% |
| C: slow infiltration | 6.1% | 19.3% |
| D: very slow infiltration (clayey, shallow or wet) | 0.5% | 13.2% |
| A/D: D as is, A if drained | 0.0% | 0.0% |
| B/D: D as is, B if drained | 7.8% | 5.7% |
| C/D: D as is, C if drained | 10.4% | 6.4% |
| Not rated | 1.2% | 6.2% |
Flooding
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| No flooding | 84.7% | 80.3% |
| Rare or very rare | 0.2% | 1.4% |
| Occasional | 14.8% | 8.5% |
| Frequent or very frequent | 0.3% | 5.0% |
| Not reported | 0.0% | 4.8% |
Seasonal high water table
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| Within 18 inches at some time of year | 8.7% | 12.1% |
| 18 inches to 3.3 feet | 15.9% | 10.5% |
| Deeper than 3.3 feet or none reported | 75.4% | 73.0% |
| Not reported | 0.0% | 4.4% |
Topsoil pH and texture
First mineral layer of each soil
Typical topsoil pH is 6.2 (slightly acidic); 80% of rated land falls between 5.0 and 6.5. Median topsoil organic matter is 2%.
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| Strongly acidic (below 5.5) | 22.2% | 58.1% |
| Moderately to slightly acidic (5.5–6.4) | 63.3% | 26.3% |
| Near neutral (6.5–7.3) | 13.4% | 9.3% |
| Alkaline (7.4 and up) | 0.0% | 0.1% |
| Not reported | 1.2% | 6.2% |
Texture
Show as a table
| Category | Montgomery County | Tennessee |
|---|---|---|
| Sandy | 0.0% | 0.7% |
| Loamy (loam, silt loam and similar) | 98.8% | 91.8% |
| Clayey (40%+ clay) | 0.0% | 1.3% |
| Organic (muck or peat) | 0.0% | 0.0% |
| Not reported (rock, urban land, etc.) | 1.2% | 6.2% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- Montgomery County, Tennessee (FIPS 47125): 343,310 acres of mapped land, 4,090 acres of open water excluded. State comparisons pool all mapped land in Tennessee.
- Method
- Shares are by mapped land area: each map unit’s acres in the county times each soil component’s percentage. Open water is excluded. Topsoil values use the first mineral horizon of each component. Full methodology.